JP2002093039A - Disk drive device and disk drive method - Google Patents

Abstract

(57) Abstract: The present invention provides a disk drive device and a disk drive method capable of changing data read performance in accordance with data read performance of a computer system and reducing noise and power consumption. It is intended to be. A disk drive device (11) that reads data from an optical disk (12) based on a data read request from a computer system (15) and sends the data to the computer system (15) detects a speed at which data is sent to the computer system (15). 19
The rotation speed of the spindle motor 13 is increased or decreased based on the detection result by the detection means 19,
And control means 20 for controlling the speed of reading data from the control unit 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
mpact Disc)-ROM (Raed Only Memory) and DVD-
The present invention relates to a disk drive apparatus and a disk drive method for reproducing an optical disk such as a ROM, and more particularly to an improvement in a terminal used as a terminal of a computer system.

[0002]

2. Description of the Related Art As is well known, the speed of reading data from an optical disk of a disk drive device as described above has been remarkably increased in recent years. In particular, in recent products, the data reading speed set as the standard speed at the time of determining the standard of the optical disk is 40 times or more for CD-ROM and 10 times or more for DVD-ROM.
Very high data reading performance is realized.

[0003] In this type of disk drive device, the rotation speed of the optical disk exceeds 10,000 rotations per minute while operating at the highest performance for both the CD-ROM and the DVD-ROM. Countermeasures to reduce noise, power consumption, and the like peculiar to high-speed rotation will be a major issue in the future.

On the other hand, in a disk drive device, C
In a usage method such as reproducing moving image data recorded on an optical disk such as a D-ROM or a DVD-ROM, even if the data reading performance is low, it is sufficient to drive the apparatus with the high data reading performance as described above. Is wasted.

[0005] In addition, the C
Even when reproducing an optical disk such as a D-ROM or a DVD-ROM, depending on the performance of the computer system, it may not always be possible to drive the disk drive at the maximum data reading performance of the disk drive. In some cases, driving with high data reading performance as described above may be useless.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and makes it possible to vary the data reading performance in accordance with the data reading performance of the computer system, thereby reducing noise and power consumption. It is an object of the present invention to provide a very good disk drive device and disk drive method that can achieve the following.

[0007]

A disk drive device according to the present invention reads data from a disk based on a data read request from a computer system.
It is intended for sending to computer systems. And detecting means for detecting the speed at which data is sent to the computer system, and control means for increasing or decreasing the rotational speed of the disk based on the detection result by the detecting means and controlling the data reading speed from the disk. It is prepared for.

Further, a disk drive device according to the present invention is directed to a device that reads data from a disk based on a data read request from a computer system and sends the data to the computer system. And
First detecting means for detecting the data reading speed of the computer system, second detecting means for detecting the data reading speed from the disk, and the rotational speed of the disk based on the detection results by the first and second detecting means And control means for controlling the speed of reading data from the disk.

Further, a disk drive device according to the present invention is directed to a device that reads data from a disk based on a data read request from a computer system, temporarily stores the data in a buffer, reads the data, and sends the data to the computer system. And detecting means for detecting the remaining amount of the buffer, and control means for increasing or decreasing the rotational speed of the disk based on the detection result by the detecting means and controlling the data reading speed from the disk. is there.

[0010] A disk drive device according to the present invention is directed to a device that reads data from a disk based on a data read request from a computer system, temporarily stores the data in a buffer, reads the data, and sends the data to the computer system. Detecting means for detecting the rate at which the data requested by the computer system is present in the buffer; and controlling means for increasing or decreasing the rotational speed of the disk based on the detection result by the detecting means and controlling the data reading speed from the disk. Is provided.

Furthermore, a disk drive device according to the present invention is directed to a device which reads data from a disk based on a data read request from a computer system, temporarily stores the data in a buffer, reads the data, and sends the data to the computer system. Detecting means for detecting the frequency of retries for delaying data reading from the disk for a predetermined time due to the buffer being full; and increasing or decreasing the rotational speed of the disk based on the detection result by the detecting means. And control means for controlling the speed of reading data from the disk.

On the other hand, a disk drive method according to the present invention is directed to a method of reading data from a disk based on a data read request from a computer system and transmitting the data to a computer system. And
A detection step of detecting a speed at which data is sent to the computer system, and a control step of increasing or decreasing the rotation speed of the disk based on the detection result of the detection step and controlling the speed of reading data from the disk. It was made.

A disk drive method according to the present invention is directed to a method for reading data from a disk based on a data read request from a computer system and sending the data to a computer system. And
A first detecting step for detecting a data reading speed of the computer system, a second detecting step for detecting a data reading speed from the disk, and a rotation speed of the disk based on the detection results of the first and second detecting steps And a control step of controlling the speed of reading data from the disk.

Further, a disk drive method according to the present invention is directed to a method for reading data from a disk based on a data read request from a computer system, temporarily storing the data in a buffer, reading the data, and sending the data to the computer system. Then, a detection step of detecting the remaining amount of the buffer and a control step of increasing or decreasing the rotation speed of the disk based on the detection result of the detection step and controlling the data reading speed from the disk are performed. is there.

A disk drive method according to the present invention is directed to a method for reading data from a disk based on a data read request from a computer system, temporarily storing the data in a buffer, reading the data, and sending the data to the computer system. A detecting step of detecting a ratio of the data requested by the computer system in the buffer; and a controlling step of increasing or decreasing the rotational speed of the disk based on the detection result of the detecting step and controlling the data reading speed from the disk. And it goes through.

Further, a disk drive method according to the present invention is directed to a method of reading data from a disk based on a data read request from a computer system, temporarily storing the data in a buffer, reading the data, and sending the data to the computer system. Then, a detection step of detecting the frequency of retries for delaying data reading from the disk for a predetermined time due to the buffer being full, and increasing or decreasing the rotational speed of the disk based on the detection result of the detection step. And a control step of controlling the speed of reading data from the disk.

According to the above configuration and method, the data transmission speed to the computer system, the data reading speed of the computer system and the data reading speed from the disk, the remaining amount of the buffer, the data requested by the computer system, Are in the buffer,
Based on the frequency of retries that delay data reading from the disk for a predetermined time due to the buffer being full, the rotational speed of the disk is increased or decreased to control the data reading speed from the disk. Therefore, the data reading performance can be made variable in accordance with the data reading performance of the computer system, and noise and power consumption can be reduced.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a disk drive device 1 described in the first embodiment.
1 is shown.

The disk drive device 11 mainly includes a spindle motor 1 for driving the optical disk 12 to rotate.
3, an optical pickup 14 for reading information recorded on the optical disk 12, and a signal processing for converting a signal read by the optical pickup 14 into a data format required by an external computer system 15 and performing error correction processing and the like. A data buffer 17 for temporarily storing data output from the signal processing device 16; outputting data stored in the data buffer 17 to the computer system 15; And a communication control device 18 for receiving commands such as reading.

The disk drive device 11
Analyzes the data read command received from the computer system 15 by the communication control device 18 and counts the total number of sectors included in the command.
And a speed control device 20 for increasing or decreasing the set number of rotations of the spindle motor 13 based on the result counted by the sector number counting device 19. The sector is a unit when the computer system 15 reads data, and the data read instruction describes how many sectors of data are required.

FIG. 2 is a flowchart showing the operation of the sector number counting device 19. That is, when started (2.1), the sector number counting device 19 activates a built-in timer (not shown) (2.2) and initializes the total number of sectors to 0 (2.3). Thereafter, the sector number counting device 19 checks whether or not a command supplied from the computer system 15, in particular, a sector read command of the optical disk 12 has been received (2.4). If the command has been received, the sector requested by the command is requested. Is added to the total number of sectors (2.
5) Return to step 2.4 to check for reception of a new command.

If a command has not been received in step 2.4, it is checked by a built-in timer whether a specified time has elapsed (2.6). If the specified time has not been reached, step 2. Return to step 4 and check whether a new command has been received. When the prescribed time has elapsed, the value of the total number of sectors at that time is recorded (2.7), and step 2.2 is performed.
Return to

That is, when the sector number counting device 19 starts its operation, the computer system 15
It records the total number of sectors of the command requested from. Then, the computer system 1
The total number of sectors of the command requested from No. 5 corresponds to the data reading speed requested by the computer system 15.

FIG. 3 is a flowchart showing the operation of the speed control device 20. When the speed control device 20 starts its operation (3.1), it waits for the sector number counting device 19 to record a new total value of the number of sectors (3.2).
As long as the new total number of sectors has not been detected (3.
3) Return to step 3.2 and continue waiting for the value of the new total number of sectors.

If a new value of the total number of sectors is found, the value of the total number of sectors is less than reference 1 (3.41), otherwise, it is less than reference 2 (3.42), or less than reference N-1. (3.43), and based on the result, the target rotation speed of the spindle motor 13 is set to speed 1 (3.51), speed 2 (3.52),
It is determined by selecting from speed N-1 (3.53) or speed N (3.54).

Each of these speeds 1 to N is such that the data request rate represented by the value of the total number of sectors can be satisfied even when any position on the optical disk 12 is read.
It is set to be the minimum value.

Subsequently, the current rotation speed of the spindle motor 13 is compared with the target speed (3.61). If the current speed is less than the target speed, the current speed is increased by 1 (3.71). If the current speed exceeds the target speed (3.62), the current speed is reduced by 1 (3.7).
2) If the current speed and the target speed match, do nothing. Thereafter, the process returns to step 3.2 and waits for the new total number of sectors to be written.

According to the first embodiment, it is checked how many sectors of a command sent from the computer system 15 are required within a specified time, and the minimum number of spindle motors 13 satisfying this request is determined. The rotation speed can be obtained. This means that the computer system 15
If the read command is issued at a slow tempo, it means that the spindle motor 13 of the disk drive device 11 also rotates slowly, so that noise reduction and low power consumption can be achieved.

The current speed of the spindle motor 13 changes by ± 1 every specified time even if the requested transfer rate from the computer system 15 changes rapidly, so that the target speed changes rapidly. The load on the disk drive device 11 due to the change can be reduced.

FIGS. 4 and 5 are flow charts showing a second embodiment of the present invention. That is, in the above-described first embodiment, the data transfer rate is expressed as the total number of sectors of the read command issued by the computer system 15 within the specified time, whereas in the second embodiment, It is expressed as the time until the total number of sectors of the read command issued by the computer system 15 reaches a certain value.

FIG. 4 is a flowchart showing the operation of the sector number counting device 19 according to the second embodiment. That is, when the sector number counting device 19 starts (4.1), the built-in timer (not shown) operates (4.
2) Initialize the total number of sectors to 0 (4.3). After that, the sector number counting device 19 starts the computer system 1
It is checked whether or not the command supplied from step 5 has been received, in particular, the sector read command of the optical disk 12 (4.4). If the command has been received, the number of sectors requested by the command is added to the total number of sectors (4. 5), step 4.
Returning to step 4, check for the reception of a new command.

If no command has been received in step 4.4, it is checked whether the total number of sectors has exceeded a prescribed value (4.6). If not, step 4.
Return to step 4 and check whether a new command has been received. When the specified value is reached, the value of the built-in timer at that time is recorded (4.7), and the process returns to step 4.2.

That is, when the operation starts, the sector number counting device 19 records the time until the total number of sectors of the command supplied from the computer system 15 reaches the specified value. The time required for the total number of sectors of the command supplied from the computer system 15 to reach the specified value corresponds to the data reading speed requested by the computer system 15.

FIG. 5 is a flowchart showing the operation of the speed control device 20 according to the second embodiment. When the speed control device 20 starts operation (5.
1) Wait for a new built-in timer value (5.2). As long as the new built-in timer value has not been detected (5.3), the process returns to step 5.2, and waits for the new built-in timer value.

If a new built-in timer value is found, it is less than criterion 1 (5.41), if not, less than criterion 2 (5.42) or less than criterion N-1 (5.43). ) Is performed, and based on the result, the target rotation speed of the spindle motor 13 is set to speed 1 (5.51), speed 2 (5.52), and speed N-1.
(5.53) or the speed N (5.54).

Each of these speeds 1 to N indicates the data request rate indicated by the value of the built-in timer,
2 is set to be the minimum value that can be satisfied when reading any position.

Subsequently, the current rotation speed of the spindle motor 13 is compared with the target speed (5.61). If the current speed is less than the target speed, the current speed is increased by 1 (5.71). If the current speed exceeds the target speed (5.62), the current speed is reduced by 1 (5.7).
2) If the current speed and the target speed match, do nothing. Thereafter, the process returns to step 5.2 and waits for a new value of the built-in timer to be written.

FIG. 6 is a flowchart showing a third embodiment of the present invention. In the above-described first embodiment, the data transfer rate is expressed as the total number of sectors of the read command issued by the computer system 15 within a specified time. On the other hand, in the third embodiment, the read command is read. Is expressed as the total number of sectors transmitted by the disk drive device 11 to the computer system 15 within a specified time in response to the request.

FIG. 6 is a flowchart showing the operation of the sector number counting device 19 according to the third embodiment. That is, when the sector number counting device 19 starts (6.1), a built-in timer (not shown) is activated (6.
2) Initialize the total number of sectors to 0 (6.3). After that, the sector number counting device 19 starts the computer system 1
It is checked whether or not data has been transmitted to (5) (6.4).
If so, the number of sectors is added to the total number of sectors (6.5), and the flow returns to step 6.4 to check for transmission of new data.

If data has not been transmitted in step 6.4, it is checked whether or not a specified time has elapsed (6.6).
If not, return to step 6.4,
Check the transmission of new data. When the specified time has elapsed, the value of the total number of sectors at that time is recorded (6.
7), and return to step 6.2.

That is, when the operation starts, the sector number counting device 19 records the total number of sectors of the data transmitted from the disk drive device 11 to the computer system 15 within the specified time. The total number of sectors of data transmitted from the disk drive device 11 to the computer system 15 within the specified time corresponds to the data reading speed requested by the computer system 15.

The operation of the speed control device 20 according to the third embodiment is the same as that shown in FIG. 3, and a description thereof will be omitted.

FIG. 7 is a flowchart showing a fourth embodiment of the present invention. In the above-described first embodiment, the data transfer rate is expressed as the total number of sectors of the read command issued by the computer system 15 within the specified time. On the other hand, in the fourth embodiment, the read command is read. Is expressed as the time until the total number of sectors transmitted from the disk drive device 11 to the computer system 15 reaches the specified value.

FIG. 7 is a flowchart showing the operation of the sector number counting device 19 in the fourth embodiment. That is, when the sector number counting device 19 is started (7.1), a built-in timer (not shown) is operated (7.
2), the total number of sectors is initialized to 0 (7.3). After that, the sector number counting device 19 starts the computer system 1
It is checked whether or not data has been transmitted to No. 5 (7.4).
If so, the number of sectors is added to the total number of sectors (7.5), and the flow returns to step 7.4 to check for transmission of new data.

If data has not been transmitted in step 7.4, it is checked whether the total number of sectors has exceeded a prescribed value (7.6). If not, step 7.
Returning to step 4, the transmission of new data is checked. When the specified value is reached, the value of the built-in timer at that time is recorded (7.
7) Return to step 7.2.

That is, when the operation of the sector number counting device 19 starts, the time until the total number of sectors of the data transmitted from the disk drive device 11 to the computer system 15 reaches the specified value is recorded. The disk drive device 11 is connected to the computer system 15
The time required for the total number of sectors of the data transmitted to reach the specified value corresponds to the data reading speed requested by the computer system 15.

The operation of the speed control device 20 in the fourth embodiment is the same as that in FIG. 5, and a description thereof will be omitted.

FIG. 8 shows the configuration of the disk drive device 21 described in the fifth embodiment of the present invention.
The disk drive device 21 mainly includes a spindle motor 23 for rotating and driving the optical disk 22, an optical pickup 24 for reading information recorded on the optical disk 22, and a signal read by the optical pickup 24, A signal processing device 26 that converts the data into a data format required by the device 25 and performs error correction processing and the like.
A data buffer 27 for temporarily storing data output from the signal processing device 26; and a data buffer 27 for storing data stored in the data buffer 27 in the computer system 2.
And a communication control device 28 for receiving a command such as data reading from the computer system 25.
It is composed of

Then, this disk drive device 21
Is an output sector number counting device 29 that analyzes a data read command received by the communication control device 28 from the computer system 25 and counts the total number of sectors included in the command, and a signal processing device read from the optical disk 22 and 2
6, an input sector number counting device 30 for counting the total number of sectors of the data that have been subjected to the signal processing, and a rotation set number of the spindle motor 23 based on the outputs and the results counted by the input sector number counting devices 29 and 30. And a speed control device 31 for increasing or decreasing the speed.

Here, the output sector number counting device 29 performs the same operation (see FIG. 2) as the sector number counting device 19 shown in FIG. 1, or the operation shown in FIG. 4, FIG. 6, and FIG. And the like.

FIG. 9 shows a detailed configuration of the input sector number counting device 30. This input sector number counting device 3
0 is a PUH radial position acquisition device 30a that acquires radial position information on the optical disk 22 where the optical pickup 24 is currently located, a rotation speed acquisition device 30b that acquires current rotational speed information of the optical disk 22, A linear velocity acquisition device 30c for acquiring the linear velocity of the disk track traced by the optical pickup 24 from the radial position obtained by the PUH radial position acquisition device 30a and the rotation speed obtained by the rotation speed acquisition device 30b; Input sector number calculation device 30 that obtains the frequency of the number of input sectors from the linear velocity obtained by speed acquisition device 30c and information on optical disk 22
d.

In this case, the PUH radius position acquisition device 30a
As a method, a method of obtaining a radial position on the optical disk 22 where the address is recorded from the address information obtained from the optical disk 22 is adopted. In addition, the position of the optical pickup 24 is directly measured by a sensor. The optical pickup 2 can be obtained by various methods, such as a method of accurately measuring the moving distance of the optical pickup 24 from a specific point whose radius is known, and knowing the current position.
4 can be known.

The rotation speed acquisition device 30b employs a method of counting the number of magnetic pole pieces embedded in the spindle motor 23 that have passed over a fixed sensor. It is possible to acquire the rotation speed information by the method described above.

Further, the linear velocity acquisition device 30c is a PUH
The linear velocity of the disk track traced by the optical pickup 24 is calculated from the radial position obtained by the radial position obtaining device 30a and the rotation speed obtained by the rotation speed obtaining device 30b.

The input sector number calculating device 30d calculates the linear velocity obtained by the linear velocity obtaining device 30c and the optical disk per sector of the optical disk 22 which the disk drive device 21 has previously obtained as the optical disk 22 information. The number of sectors that can be input per unit time (the number of input sectors) is calculated from the length on 22. The input sector number calculating device 30d calculates the latest input sector number at any time based on the changing radial position of the optical pickup 24 and the rotation speed of the optical disk 22.

FIG. 10 is a flowchart showing the operation of the speed control device 28 according to the fifth embodiment. That is, when starting the operation (10.1), the speed control device 28 first waits until the number of input sectors and the number of output sectors are updated to new values (10.2). If both have not been updated yet (10.3), the process continues waiting at step 10.2.

When both are updated, the unit of both numerical values is adjusted to, for example, [the number of sectors / second] (10.
4). Subsequently, a sector number difference is calculated (10.5). This difference in the number of sectors is obtained by subtracting the number of output sectors from the number of input sectors, and can take both positive and negative values.

Next, it is checked whether the difference in the number of sectors is equal to or larger than the reference value A (10.6). If the difference in the number of sectors is less than the reference value A, it means that the current rotation speed of the optical disk 22 is not enough to satisfy the data supply rate required by the computer system 25, and the rotation speed of the spindle motor 23 is Is increased by one step (10.7).

Next, as a result of the addition, it is checked whether or not the current speed has exceeded the settable maximum speed of the disk drive device 21 (10.8). Return (10.9). Then, both when the maximum speed is exceeded and when the maximum speed is not exceeded, step 10.2
And waits for the new number of input sectors and the number of output sectors.

On the other hand, if the difference in the number of sectors is equal to or larger than the reference value A in step 10.6, it is checked whether the difference in the number of sectors is equal to or larger than the reference value B (10.10). Generally, the reference value B is a value larger than the reference value A. If the difference in the number of sectors is larger than the reference value B, it means that the number of input sectors is larger than the number of output sectors by a certain amount or more. Since the disk drive device 21 is set to a speed higher than necessary, the spindle motor 23 The current speed is subtracted by one step (10.11) in order to reduce the rotation speed.

As a result, it is checked whether or not the current speed has interrupted the minimum speed (10.12). If the current speed has interrupted, the current speed is reset to the minimum speed (10.10.
3). Then, both when the minimum speed is interrupted and when it is not interrupted, the process returns to step 10.2 and waits for the new number of input sectors and the number of output sectors.

In FIG. 10, it is waited that both the number of input sectors and the number of output sectors are updated in step 10.3. However, as another implementation method, the number of new input sectors and the number of new output sectors are changed. Or the speed control device 28 has its own timer, and the processing after step 10.4 is performed at regular time intervals regardless of the update of the number of input sectors and the number of output sectors. And the like.

As will be described later, these methods are desirably adopted in the case of an embodiment in which updating of the timer value is delayed until the number of frames or the number of sectors reaches a certain number.

In FIG. 10, the difference between the number of input sectors and the number of output sectors is calculated in step 10.5, and this value is used as a determination target in steps 10.6 and 10.10. As a different implementation method, there is a method of obtaining the ratio between the number of input sectors and the number of output sectors, or, as will be described later, a product of the two numbers and making the determination target.

In this method, although it is necessary to consider special processing when the number of input sectors or output sectors is 0 when the divisor is obtained, the unit of the number of input sectors and the number of output sectors is considered. By preparing the reference values A and B, it is possible to omit the process of matching the units in step 10.4, which has an advantage that the structure of the speed control device 28 can be simplified.

According to the fifth embodiment, the rate of data supplied from the optical disk 22 is compared with the rate of data requested by the computer system 25, and the acceleration of the spindle motor 23 is determined based on the difference. -Since the deceleration is determined, finer control of the rotational speed can be realized as compared with the first embodiment.

FIG. 11 shows a sixth embodiment of the present invention. In the sixth embodiment, the configuration of the entire disk drive device is the same as that of the fifth embodiment shown in FIG. 8, and the signal processing device 26 and the input sector number counting device 30 are modified. .

That is, in the fifth embodiment described above, the input sector number counting device 30 estimates the number of input sectors from the position of the optical pickup 24 and the rotation speed of the optical disk 22 by calculation. On the other hand, this sixth
In this embodiment, the number of input sectors is obtained by counting the frequency of the synchronization signal generated as a result of processing the signal from the optical pickup 24.

In FIG. 11, the optical pickup 24
Are converted into a sequence of reproduced signals by the signal processing unit 26a. The reproduction signal is several tens bytes to several tens.
It is a sequence of fixed-length frames of 00 bytes and is output to the data buffer 27 via the data storage and correction unit 26b.

The break of each frame of the reproduction signal is identified by the synchronization signal. In the signal processing device 26, a synchronization signal is detected from a reproduced signal by a synchronization signal detection device 26c and is used for reconstructing sector data in the data correction storage unit 26b. In the sixth embodiment, the synchronization signal is supplied to the input sector number counting device 30.
In this case, the input sector number counting device 30 counts the total number of frames.

FIG. 12 is a flowchart showing the operation of the input sector number counting device 30 according to the sixth embodiment. The input sector number counting device 30 starts operation (1
2.1) Immediately after that, a built-in timer (not shown) is activated (1).
2.2), clear the total number of internal variable frames to 0 (12.3). Then, it is checked whether a new synchronization signal has been detected (12.4).

If a new frame is detected,
Proceeding to step 12.5, the total number of internal variable frames is increased by one. Then, the process returns to step 12.4 to check whether the next synchronization signal has been detected.

On the other hand, if a new frame has not been detected in step 12.4, it is checked whether the specified time has elapsed (12.6). If the specified time has not elapsed, the flow returns to step 12.4 to check the detection of the next synchronization signal. If the specified time has elapsed, the number of frames counted so far is recorded (12.7), and step 12.
Returning to step 2, the built-in timer is operated.

According to the sixth embodiment, the fifth embodiment
Since the same effects as those of the embodiment can be obtained, and the number of input sectors is not required to perform a complicated operation, the input sector number counting device 30 has an advantage of a simple structure.

FIG. 13 is a flowchart showing a seventh embodiment of the present invention. In the above-described sixth embodiment, the input sector number counting device 30 counts the number of synchronization signals generated within a certain period of time, whereas in the seventh embodiment, the number of synchronization signals Is a format that measures the time until the value reaches a certain value.

FIG. 13 is a flowchart showing the operation of the input sector number counting device 30 according to the seventh embodiment. The input sector number counting device 30 starts operation (1
3.1) Immediately after that, a built-in timer (not shown) is activated (1).
3.2), clear the total number of internal variable frames to 0 (13.3). Then, it is checked whether a new synchronization signal has been detected (13.4).

If a new frame is detected,
Proceeding to step 13.5, the total number of internal variable frames is increased by one. Then, the process returns to step 13.4 to check whether the next synchronization signal has been detected.

On the other hand, if a new frame has not been detected in step 13.4, it is checked whether or not the total number of frames has reached a specified value (13.6). If the total number of frames has not reached the specified value, the flow returns to step 13.4 to check the detection of the next synchronization signal. If the specified number has been reached, the measured time at that time, that is, the value of the built-in timer is recorded (13.7), and the process returns to step 13.2 to operate the built-in timer.

According to the seventh embodiment, the sixth embodiment
It is possible to obtain substantially the same effect as that of the embodiment. In the sixth embodiment, the spindle motor 23
When the rotation is very low, the error increases because the number of frames to be measured is small. On the other hand, in the seventh embodiment, one measurement is performed until a certain number of frames are measured. Therefore, the measurement error can always be kept within a certain value.

FIG. 14 shows an eighth embodiment of the present invention. In the eighth embodiment, the configuration of the entire disk drive device is the same as that of FIG. 8, and the signal processing device 26 and the input sector number counting device 30 are different from those of the sixth embodiment shown in FIG. It has been transformed.

That is, in the above-described sixth embodiment, the input sector number counting device 30 receives the frame synchronization signal as an input, whereas in the eighth embodiment, the input sector number counting device 30 integrates and corrects the frame. The synchronization signal of the completed sector data is used.

In FIG. 14, a signal processing device 26 converts an input signal from an optical pickup 24 into a signal processing unit 26.
a, a reproduction signal is created, a synchronization signal is detected from the reproduction signal by the synchronization signal detection device 26c, and the data storage and correction unit 26b is used by the synchronization signal and the reproduction signal.
Are assembling frame data into sector data and outputting this to the data buffer 27.

In this case, in order to put correct data into the data buffer 27, a synchronization signal detecting device 26d for detecting a synchronization signal from the flow of sector data is provided, and this sector synchronization signal is supplied to the data buffer 27. .
In the eighth embodiment, the sector synchronization signal is supplied to the input sector number counting device 30.

FIG. 15 is a flowchart showing the operation of the input sector number counting device 30 according to the eighth embodiment. The input sector number counting device 30 starts operation (1
5.1) Immediately after that, a built-in timer (not shown) is activated (1).
5.2), the total number of sectors, which is an internal variable, is cleared to 0 (15.3). Then, it is checked whether a new synchronization signal has been detected (15.4).

If a new synchronization signal is detected,
Proceeding to step 15.5, the total number of sectors, which is an internal variable, is increased by one. Then, the process returns to step 15.4 to check whether the next synchronization signal has been detected.

On the other hand, if a new synchronization signal has not been detected in step 15.4, it is checked whether or not a specified time has elapsed (15.6). If the specified time has not elapsed, the flow returns to step 15.4 to check the detection of the next synchronization signal. If the specified time has elapsed, the number of sectors counted up to that time is recorded (15.7), and step 15.2 is performed.
Then, the built-in timer is operated.

According to the eighth embodiment described above, substantially the same effects as in the sixth embodiment can be obtained.
The difference from the sixth embodiment is that the input sector number counting device 3
0 is the frequency of detecting the synchronization signal. In general, if the linear velocity is the same, the frequency of sector generation is lower than the frequency of frame generation. Therefore, according to the eighth embodiment, the frequency of generation of a synchronization signal can be suppressed lower than in the sixth embodiment. Therefore, in the eighth embodiment, it is possible to suppress the performance of the input sector number counting device 30 lower than in the sixth embodiment.

FIG. 16 is a flowchart showing a ninth embodiment of the present invention. In the above-described ninth embodiment, the input sector number counting device 30 records the number of sectors counted up to that time at regular intervals, whereas in the ninth embodiment, the number of sectors is reduced to a fixed number. The time to reach is measured.

FIG. 16 is a flowchart showing the operation of the input sector number counting device 30 according to the ninth embodiment. The input sector number counting device 30 starts operation (1
6.1) Immediately after that, a built-in timer (not shown) is activated (1).
6.2), clear the total number of sectors, which is an internal variable, to 0 (16.3). Then, it is checked whether a new synchronization signal is detected (16.4).

If a new synchronization signal is detected,
Proceeding to step 16.5, the total number of sectors, which is an internal variable, is increased by one. Then, the process returns to step 16.4 to check whether the next synchronization signal has been detected.

On the other hand, if a new synchronization signal has not been detected in step 16.4, it is checked whether or not the total number of sectors has exceeded a prescribed value (16.6). If not, the flow returns to step 16.4 to check the detection of the next synchronization signal. If the value exceeds the specified value, the internal timer value at that time is recorded (16.7), and the process returns to step 16.2 to repeat the operation from the operation of the internal timer.

According to the ninth embodiment, the eighth embodiment
It is possible to obtain substantially the same effect as that of the embodiment. In the eighth embodiment, the spindle motor 23
When the rotation is very low, the error increases because the number of sectors to be measured decreases, whereas in the ninth embodiment, one measurement is performed until a certain number of sectors is measured. Therefore, the measurement error can always be kept within a certain value.

FIG. 17 shows the configuration of the disk drive 32 described in the tenth embodiment of the present invention. The disk drive device 32 mainly includes a spindle motor 34 for rotating and driving the optical disk 33, an optical pickup 35 for reading information recorded on the optical disk 33, and a signal read by the optical pickup 35, which is connected to an external computer system. 36, a signal processing device 37 for performing error correction processing and the like by converting the data into a data format required by the data processing device 36; a data buffer 38 for temporarily storing data output from the signal processing device 37; Data to the computer system 36, and
And a communication control device 39 for receiving an instruction such as data reading from the communication controller 39.

Then, the disk drive device 32
A buffer remaining amount counting device 40 for counting the remaining amount in the data buffer 38, and a speed control device 41 for increasing or decreasing the rotation setting number of the spindle motor 34 based on the result counted by the buffer remaining amount counting device 40. It has.

Note that the data buffer 38 is
It has a data buffer function of O (first-in first-out) format. Then, a management variable indicating the number of valid data in the data buffer, a buffer remaining amount, and the like are recorded.

The buffer remaining amount is 0 immediately after the start of the disk drive 32, and increases by the number of sectors read each time a new valid sector is read from the optical disk 33. Each time a sector has been transmitted to the system 36, the number is reduced by the number of transmitted sectors, and is changed to be set to 0 by a so-called buffer miss, in which a read command requests a sector other than those included in the data buffer 38.

FIG. 18 is a flowchart showing the operation of the remaining buffer counting device 40 according to the tenth embodiment. The buffer remaining amount counting device 40 starts (18.
1) When this is done, immediately after startup, the total buffer capacity, which is an internal variable, is set to 0 (18.2). Subsequently, a built-in timer (not shown) is operated (18.3). This is for recording the value of the minimum remaining amount at regular intervals.

Then, it waits for a buffer mishit of a read command occurring within a specified time, a sector input from the signal processing device 37, and a sector transmission completion event from the communication control device 39.

Either a buffer mishit of a read instruction is detected (18.4), a new sector input from the signal processing device 37 is detected (18.5), or via the communication control device 39. When the completion of the sector transmission is detected (18.6), the buffer capacity which fluctuates as a result is compared with the minimum remaining amount of the internal variable (18.7). When the minimum remaining amount is larger, the minimum value is used. The remaining amount is set to the value of the buffer remaining amount (18.8). Then, the flow shifts to step 18.4 to wait for the occurrence of a new event.

If no event has occurred in steps 18.4, 18.5, and 18.6, the specified time is checked (18.9). It moves to step 18.4 and waits for the detection of a new event.

On the other hand, when the prescribed time has elapsed, the value of the minimum remaining amount at that time is recorded (18.10), and the value of the minimum remaining amount is re-initialized with the value of the entire capacity of the data buffer 38. (18.11) Returning to step 18.3, the built-in timer is restarted.

That is, the buffer remaining amount counting device 40
After the start-up, the minimum value of the remaining buffer amount for that period is recorded at regular intervals.

FIG. 19 is a flowchart showing the operation of the speed control device 41 according to the tenth embodiment. When the speed control device 41 is started (19.1),
It waits for the buffer remaining amount counting device 40 to record the new minimum remaining amount (19.2). This means that the speed control device 41 and the buffer remaining amount counting device 40 operate in synchronization.

While a new minimum remaining amount is not recorded, (1
9.3) Return to step 19.2 and continue waiting for a new minimum remaining amount. After the new minimum remaining amount is updated, the current rotation speed of the optical disk 33 is changed based on the minimum remaining amount.

First, it is checked whether the minimum remaining amount is less than a predetermined reference value A (19.4). If the minimum remaining amount is less than the reference value A, only 1 is added to the current speed (19.5). Then, it is checked whether the current speed has exceeded the maximum value (19.6). If the current speed has exceeded the maximum value, the current speed is returned to the maximum value (19.7). Step 1 whether the current speed exceeds the maximum value or not
Return to 9.2 and wait for the next minimum remaining amount.

On the other hand, if the minimum remaining amount is equal to or larger than the reference value A in step 19.4, then it is compared with a reference value B different from the reference value A (19.8). If the minimum remaining amount exceeds the reference value B, the current speed is reduced by 1 (19.9). Then, it is checked whether or not the current speed is lower than the minimum speed as a result of the reduction (19.10). If the current speed is lower than the minimum speed, the current speed is returned to the minimum speed (1.
9.11), return to step 19.2 and wait for the next minimum remaining amount.

If the minimum remaining amount is less than the reference value B in step 19.8, or if the current speed becomes equal to or higher than the minimum speed in step 19.10, step 1
Return to 9.2 and wait for the next minimum remaining amount.

According to the tenth embodiment, if the computer system 36 performs the sequential read at a relatively high rate, the remaining amount of the data buffer 38 changes to a very small value. Each time, the spindle motor 34 is accelerated, and is stabilized where the reading rate of the computer system 26 and the data supply capacity of the disk drive device 32 are balanced.

Also, if the computer system 36 performs sequential read at a relatively slow rate,
Since the data buffer 38 always transitions with much data remaining, the spindle motor 34 is decelerated,
It is stabilized where the reading rate of the computer system 26 and the data supply capability of the disk drive device 32 balance.

Further, when the computer system 36 reads various addresses on the optical disk 33 in an intermittent manner, that is, when sequential reading is not performed, the spindle motor 34 is gradually accelerated.
High speed rotation can result in quick execution of a seek operation.

FIG. 20 shows the configuration of a disk drive unit 42 described in the eleventh embodiment of the present invention. The disk drive device 42 mainly includes a spindle motor 44 for rotating and driving the optical disk 43, an optical pickup 45 for reading information recorded on the optical disk 43, and a signal read by the optical pickup 45 for transmitting an external computer system. A signal processing device 47 that converts the data into a data format required by 46 and performs error correction processing and the like, a data buffer 48 for temporarily storing data output from the signal processing device 47, and a data buffer 48 for storing data in the data buffer 48. The data output to the computer system 46 and the computer system 46
And a communication control device 49 for receiving a command such as data reading from the communication controller 49.

Then, the disk drive device 42
Includes a statistical processing device 50 that statistically processes information generated by the communication control device 49, and a speed control device 51 that increases and decreases the number of rotations of the spindle motor 44 based on the result processed by the statistical processing device 50. Have.

The communication control device 49 generates information to be used by the statistical processing device 50 in addition to the original operation of performing data communication between the data buffer 48 and the computer system 46 and notifies the statistical processing device 50 of the information. It has the function to do.

FIG. 21 is a flow chart showing the operation in which the communication control device 49 in the eleventh embodiment issues a notification to the statistical processing device 50. Communication control device 49
Is started (21.1), it waits for the reception of a read command (21.2). When the read command is received, the packet command is analyzed to obtain a read start address, and this is set as an internal variable start address. Store (21.3).

Subsequently, the start address is set to the data buffer 4
8 is checked (21.4), and if a hit is found, the statistical processing device 50 is notified of the hit (21.5). Then, the data in the data buffer 48 is transmitted (21.6).

If the sector of the corresponding address does not exist in the data buffer 48, the statistical processing device 50 is notified of a mishit (21.7), and seek is started to obtain data of the target sector (21). .8).

On the other hand, if the read command has not been received, it is checked whether the transmission of the data block has been completed (21.9). The transmission of the data block is to procure a part or all of the data length required by the read command from the data in the data buffer 48 and transmit it to the computer system 46. Therefore, the completion of the data block transmission does not necessarily mean that the entire data length required by the read command has been transmitted.

If the transmission of the data block has been completed, it is checked whether all the data of the read command has been transmitted due to the completion of the transmission (21.10).
If the transmission has not been completed, the head address of the remaining data is stored as the internal variable start address (21.1).
1), merging with step 21.4, data buffer 4
Check for a hit to 8.

If the transmission completion of the data block has not been detected, or if the transmission of all data requested by the read command has been completed due to the detected data block transmission completion, an appropriate end process is performed. Step 2
Return to 1.2 and wait for the next event.

As described above, the operation of notifying a hit in step 21.5 and the operation of notifying a mishit in step 21.7 are operations added to the original operation in the communication control device 49.

FIG. 22 is a flowchart showing the operation of the statistical processing device 50 according to the eleventh embodiment. When the statistical processing device 50 is started (22.1),
The internal variable hit total and the mishit total are both initialized to 0 (22.2), a built-in timer (not shown) is started (22.3), and a notification from the communication control device 49 is waited.

First, it is checked whether or not there is a hit notice (22.4). If there is a notice, the hit total is increased by 1 (22.5), and the flow returns to step 22.4 to wait for the next notice. . If there is no hit notification, it is checked whether there is a mishit notification (22.6).
The total number of mishits is increased by 1 (22.7), and the process returns to step 22.4 to wait for the next notification.

If there is no notification, it is checked whether the specified time has elapsed (22.8). If the specified time has elapsed, the total hit and the total miss are recorded (22.9). Returning to step 22.2, the internal variable hit total and the miss hit total are initialized.

On the other hand, if the specified time has not elapsed, the flow returns to step 22.4 to check whether there is a new notification.

FIG. 23 is a flowchart showing the operation of the speed control device 51 according to the eleventh embodiment. When the speed control device 51 is started (23.1),
Wait for the hit total and the miss hit total to be newly written (23.2). This indicates that the statistical processing device 50 and the speed control device 51 are operating in synchronization.

If a new value has not been written (23.3), the process returns to step 23.2 and waits for each cumulative value to be written. Once the new value has been written,
Subsequently, it is checked whether or not the sum of the hit total and the mishit total is 0 (23.4). If it is 0, the process proceeds to step 23.11 described below to perform a deceleration operation.

The sum of the hit total and the mishit total is 0
If not, calculate the hit rate (23.5). The hit rate is a numerical value calculated by the cumulative total of hits / (cumulative total of hits + cumulative total of mishits), and how much of the data to be transmitted to the computer system 46 is the data in the data buffer 48. Is an index indicating whether or not transmission was possible immediately based on.

Subsequently, it is checked whether or not the hit ratio is less than the reference value A (23.6). If the hit ratio is less than the reference value A, only 1 is added to the current speed (23.
7). As a result, it is determined whether or not the current speed has exceeded the maximum speed (23.8).
The current speed is returned to the highest speed (23.9). If the current speed exceeds or does not exceed the maximum speed, step 23.2
And waits for writing of the next hit total and mishit total.

On the other hand, when the hit ratio is equal to or higher than the reference value A, it is checked whether or not the hit ratio exceeds the reference value B (23.10). Generally, the reference value B is a value equal to or greater than the reference value A. If it does not exceed the reference value B, the flow returns to step 23.2 to wait for writing of the next hit total and the total number of mishits.

If the hit ratio exceeds the reference value B, the current speed is reduced by 1 (23.11). And
Check whether the current speed is below the minimum speed (23.
12) If interrupted, return the current speed to the minimum speed (23.13). Whether the current speed is below or below the lowest speed, the flow returns to step 23.2 to wait for writing of the next hit total and mishit total.

According to the eleventh embodiment described above, it is determined whether or not the data requested by the computer system 46 in response to the read command can be immediately transmitted from the data buffer 48 to determine whether the spindle motor 44 is accelerated or decelerated. Thus, it is possible to asymptotically approach the rotational speed of the spindle motor 44 that satisfies the sequential read rate required by the computer system 46 without excess or shortage.

Further, the spindle motor 44 can be accelerated or decelerated in accordance with buffering rules other than read-ahead, for example, more advanced buffer usage methods such as caching frequently used sector data. It is.

FIG. 24 shows the structure of a disk drive device 52 described in the twelfth embodiment of the present invention. The disc drive device 52 mainly includes a spindle motor 54 for rotatingly driving the optical disc 53, an optical pickup 55 for reading information recorded on the optical disc 53, and a signal read by the optical pickup 55 for transmitting an external computer system. A signal processing device 57 that performs error correction processing and the like by converting the data format to the data format required by 56, a data buffer 58 that temporarily stores data output from the signal processing device 57, and a data buffer 58 that is stored in the data buffer 58. Data to the computer system 56, and
And a communication control device 59 for receiving a command such as data reading from the communication controller 59.

The disk drive 52
Includes a statistical processing device 60 that statistically processes information generated by the signal processing device 57, and a speed control device 61 that increases and decreases the number of rotations of the spindle motor 54 based on the result processed by the statistical processing device 60. Have. In this case, the signal processing device 57 has a function of notifying the statistical processing device 60 of timing information of internal processing (retry) that is originally performed.

FIG. 25 is a flow chart showing the operation of the signal processing device 57 in the twelfth embodiment. When the signal processing device 57 is started (25.1),
An operation is performed to obtain a seek target address on the optical disc 53 and to obtain data of the seek target address.

First, it is checked whether or not the seek target address has been determined (25.2). If not determined, the process waits until the seek target address is set. If the seek target address is determined, it is checked whether the data of the seek target address has already been acquired (25.
3) If not acquired, seek to the target address (25.4) and acquire the data.

When the data of the target address is obtained, it is checked whether or not the obtained data can be stored in the data buffer 58 (25.5). If the data cannot be written because there is no space in the data buffer 58, the optical disk 53 is rotated by one turn unnecessarily,
After the delay time, writing to the data buffer 58 is tried again (retry operation).

For this retry operation, step 25.
4 and seek is performed again to the target address. Prior to this, the occurrence of a retry is notified to the statistical processing device 60 (25.6).

If the acquired data can be written to the data buffer 58, the data is transferred to the data buffer 5
8 (25.7), then calculate the next seek target address (usually the current seek target address + 1) (25.8), and return to step 25.2.

The data written in the data buffer 58 in the above step 25.7 may be immediately transmitted to the computer system 56 by the communication control device 59, or may be transmitted after the address at which the read was completed immediately before. In some cases, the data at the address is pre-read and the computer system 56 prepares for issuing the next read instruction.

FIG. 26 is a flowchart showing the operation of the statistical processing device 60 according to the twelfth embodiment. When the statistical processing device 60 is started (26.1),
First, the number of retries, which is an internal variable, is initialized to 0 (2
6.2), after activating a built-in timer (not shown) (2)
6.3), monitor the occurrence of retry (23.
4).

If a retry has occurred, the internal variable retry count is increased by 1 (26.5), and step 2 is executed.
Return to 6.4 and wait for the notification of the retry occurrence again. If there is no notification of the occurrence of a retry in step 26.4, it is checked whether a specified time (for example, 1 second) has elapsed since the start of the built-in timer (26.6).

If the specified time has not elapsed, the flow directly returns to step 26.4 to check whether there is a notice of retry occurrence. If the specified time has elapsed, the value of the internal variable retry count is recorded (26.7).
Returning to step 2, the internal variables are initialized.

That is, the statistical processing device 60 keeps recording the number of retry occurrence notifications that have occurred during that period at regular time intervals.

FIG. 27 is a flowchart showing the operation of the speed control device 61 according to the twelfth embodiment. When the speed control device 61 is started (27.1),
It waits for the statistical processing device 60 to newly write the number of retries (27.2). This is the statistical processing device 6
0 and the speed control device 61 operate synchronously.

If the new retry count has not been written (27.3), the flow returns to step 27.2 to wait for the retry count to be written. If the number of retries is written, this is compared with the reference value A (27.4). The reference value A is set to a relatively small value (for example, 3).

If the number of retries is less than the reference value A, it means that read issuance from the computer system 56 is frequent and the data buffer 58 has little room, so 1 is added to the current speed (27. 5) The spindle motor 54 is accelerated. However, if the current speed exceeds the maximum speed (27.6), the current speed is reset to the maximum speed (27.7). If the current speed exceeds or does not exceed the maximum speed, the process returns to step 27.2 to wait for writing of a new number of retries.

On the other hand, if the number of retries is equal to or larger than the reference value A in step 27.4, it is checked whether or not the number exceeds the reference value B which is larger than the reference value A (27.8). The reference value B is considerably larger than the reference value A (for example, 8).

If the number of retries is equal to or smaller than the reference value B, the flow returns to step 27.2 to wait for writing of the next number of retries. If the number of retries exceeds the reference value B,
Since the optical disk 53 is rotating faster than necessary and writing to the data buffer 58 cannot be performed, which means that retries are frequently occurring, the current speed is subtracted by 1 (27.9), and the spindle speed is reduced. The motor 54 is decelerated.

However, if the current speed is below the minimum speed (27.10), the current speed is reset to the minimum speed (27.11). Then, regardless of whether the current speed has interrupted the minimum speed or not, the process returns to step 27.2 and waits for writing of a new number of retries.

According to the twelfth embodiment, the comparison between the data reading rate by the computer system 56 and the data reading rate from the optical disk 53 is determined by the occurrence of a retry in the management of the data buffer 58. In order to determine the acceleration or deceleration of the spindle motor 54,
The spindle motor 54 can be controlled according to the data supply margin of the disk drive device 52.

Further, with the minimum remaining amount in the tenth embodiment, it may be difficult to determine the deceleration when there is room in the data buffer 38, but in the twelfth embodiment, the retry By looking at the frequency, one can easily determine whether to slow down or not.

The present invention is not limited to the above-described embodiments, but can be implemented with various modifications without departing from the spirit and scope of the invention.

[0154]

As described in detail above, according to the present invention,
It is possible to provide a very good disk drive device and disk drive method that can make the data read performance variable in accordance with the data read performance of the computer system and can reduce noise and power consumption.

[Brief description of the drawings]

FIG. 1 is a block diagram for explaining a first embodiment of the present invention;

FIG. 2 is a flowchart for explaining the operation of the sector counting device according to the first embodiment;

FIG. 3 is a flowchart for explaining the operation of the speed control device according to the first embodiment;

FIG. 4 is a flowchart illustrating an operation of a sector number counting device according to a second embodiment of the present invention.

FIG. 5 is a flowchart illustrating an operation of the speed control device according to the second embodiment.

FIG. 6 is a flowchart illustrating an operation of a sector number counting device according to a third embodiment of the present invention.

FIG. 7 is a flowchart illustrating the operation of a sector number counting device according to a fourth embodiment of the present invention.

FIG. 8 is a block diagram for explaining a fifth embodiment of the present invention;

FIG. 9 is a block diagram showing the details of an input sector number counting device according to the fifth embodiment;

FIG. 10 is a flowchart for explaining the operation of the speed control device according to the fifth embodiment.

FIG. 11 is a block diagram for explaining a sixth embodiment of the present invention;

FIG. 12 is a block diagram for explaining details of an input sector number counting device according to the sixth embodiment;

FIG. 13 is a flowchart illustrating an operation of the input sector number counting device according to the seventh embodiment of the present invention.

FIG. 14 is a block diagram showing a configuration according to an eighth embodiment of the present invention;

FIG. 15 is a flowchart shown to explain the operation of the input sector number counting device in the eighth embodiment.

FIG. 16 is a flowchart for explaining the operation of the input sector number counting device according to the ninth embodiment of the present invention.

FIG. 17 is a block diagram for explaining a tenth embodiment of the present invention;

FIG. 18 is a flowchart illustrating an operation of the buffer remaining capacity counting device according to the tenth embodiment.

FIG. 19 is a flowchart illustrating an operation of the speed control device according to the tenth embodiment.

FIG. 20 is a block diagram for explaining an eleventh embodiment of the present invention;

FIG. 21 is a flowchart illustrating an operation of the communication control device according to the eleventh embodiment.

FIG. 22 is a flowchart shown to explain the operation of the statistical processing device according to the eleventh embodiment.

FIG. 23 is a flowchart for explaining the operation of the speed control device according to the eleventh embodiment.

FIG. 24 is a block diagram showing a twelfth embodiment of the present invention;

FIG. 25 is a flowchart shown to explain the operation of the signal processing device according to the twelfth embodiment;

FIG. 26 is a flowchart for explaining the operation of the statistical processing device according to the twelfth embodiment;

FIG. 27 is a flowchart shown to explain the operation of the speed control device in the twelfth embodiment.

[Explanation of symbols]

 11 disk drive device, 12 optical disk, 13 spindle motor, 14 optical pickup, 15 computer system, 16 signal processing device, 17 data buffer, 18 communication control device, 19 sector counting device, Reference Signs List 20 speed control device 21 disk drive device 22 optical disk 23 spindle motor 24 optical pickup 25 computer system 26 signal processing device 27 data buffer 28 communication control device 29 ... output sector number counting device, 30 ... input sector number counting device, 31 ... speed control device, 32 ... disk drive device, 33 ... optical disk, 34 ... spindle motor, 35 ... optical pickup, 36 ... computer system, 37 ... signal Processing unit, 38 ... data 39: communication control device, 40: buffer remaining amount counting device, 41: speed control device, 42: disk drive device, 43: optical disk, 44: spindle motor, 45: optical pickup, 46: computer system, 47 ... Signal processing device, 48 Data buffer, 49 Communication control device, 50 Statistical processing device, 51 Speed control device, 52 Disk drive device, 53 Optical disk, 54 Spindle motor, 55 Optical pickup, 56 Computer system, 57: Signal processing device, 58: Data buffer, 59: Communication control device, 60: Statistical processing device, 61: Speed control device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 20/18 572 G11B 20/18 572F

Claims (10)

[Claims] 1. A disk drive device for reading data from a disk based on a data read request from a computer system and sending the data to the computer system, a detecting means for detecting a speed of sending data to the computer system, A disk drive device comprising: control means for increasing or decreasing the rotational speed of the disk based on a result of detection by the detecting means, and controlling a data reading speed from the disk. 2. A disk drive device for reading data from a disk based on a data read request from a computer system and sending the data to the computer system, wherein first detection means for detecting a data reading speed of the computer system; Second detecting means for detecting a data reading speed from the disk, and increasing or decreasing the rotation speed of the disk based on a detection result by the first and second detecting means, and controlling a data reading speed from the disk. A disk drive device comprising: a control unit. 3. A disk drive device for reading data from a disk based on a data read request from a computer system, temporarily storing the data in a buffer, reading the data, and sending the read data to the computer system. And a control means for increasing or decreasing the rotation speed of the disk based on the detection result of the detection means, and controlling the speed of reading data from the disk. 4. A disk drive device for reading data from a disk based on a data read request from a computer system, temporarily storing the data in a buffer, reading the data, and sending the data to the computer system, wherein the data requested by the computer system is Detecting means for detecting a ratio present in the buffer, and control means for increasing or decreasing the rotation speed of the disk based on a detection result by the detecting means and controlling a data reading speed from the disk. Characterized disk drive device. 5. A disk drive device for reading data from a disk based on a data reading request from a computer system, temporarily storing the data in a buffer, reading the data, and sending the read data to the computer system, when the buffer becomes full. Detecting means for detecting the frequency of occurrence of retries for delaying data reading from the disk for a predetermined time, and increasing or decreasing the rotation speed of the disk based on the detection result by the detecting means;
A disk drive device comprising: control means for controlling a data reading speed from the disk. 6. A disk drive method for reading data from a disk based on a data read request from a computer system and sending the data to the computer system, a detecting step of detecting a speed at which data is sent to the computer system. A control step of increasing or decreasing the rotation speed of the disk based on the detection result of the detection step and controlling the data reading speed from the disk. 7. A disk drive method for reading data from a disk based on a data read request from a computer system and sending the data to the computer system, wherein a first detecting step of detecting a data reading speed of the computer system; A second detection step of detecting a data reading speed from the disk, and a rotation speed of the disk is increased or decreased based on a result of the detection by the first and second detection steps, to control a data reading speed from the disk. A disk drive method comprising a control step. 8. A disk drive method for reading data from a disk based on a data read request from a computer system, temporarily storing the data in a buffer, reading the data, and sending the data to the computer system, wherein the remaining amount of the buffer is detected. And a control step of increasing or decreasing the rotation speed of the disk based on a detection result of the detection step and controlling a data reading speed from the disk. 9. A disk drive method in which data is read from a disk based on a data read request from a computer system, temporarily stored in a buffer, read out and sent to the computer system, wherein the data requested by the computer system is A detection step of detecting a ratio of the data present in the buffer; and a control step of increasing or decreasing the rotation speed of the disk based on a detection result of the detection step and controlling a data reading speed from the disk. Disk drive method. 10. Reading data from a disk based on a data reading request from a computer system,
A disk drive method for storing data in a buffer, reading the data, and sending the data to the computer system.
A detecting step of detecting a frequency of retry for delaying data reading from the disk for a predetermined time due to the buffer being full, and increasing or decreasing the rotation speed of the disk based on a detection result of the detecting step Controlling the speed of reading data from the disk.