JP2000285590A - Disk unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record an image pickup result even just after the operation of recording start while effectively avoiding increase in power consumption when applying a device to a removable hard disk device recording a video signal and to output a reproduced result even just after the operation of reproduction start while effectively avoiding increase in power consumption. SOLUTION: At the time of recording data which is to be recorded is temporarily held in a buffer memory until the rotary speed of a disk-like recording medium becomes a writing possible rotary speed. At the time of reproduction, data which is held in the buffer memory and is previously read is outputted until the rotary speed of the disk-like recording medium becomes rotary speed by which reproduction can be executed. The data transfer speed of data recorded in the disk-like recording medium is controlled in accordance with the data quantity of data held in the buffer memory.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive, and can be applied to, for example, a removable hard disk drive for recording video signals. The present invention effectively avoids an increase in power consumption by temporarily storing data to be recorded in a buffer memory until the rotation speed of the disk-shaped recording medium becomes a writable rotation speed during recording. It is also possible to record an imaging result or the like immediately after the operation of starting recording. During playback,
Until the rotational speed of the disk-shaped recording medium reaches a reproducible rotational speed, by outputting the pre-read data held in the buffer memory, it is possible to effectively avoid an increase in power consumption and immediately after the operation of starting reproduction. , A reproduction result can be output.

[0002]

2. Description of the Related Art Conventionally, as a device for recording a video signal, a video tape recorder using a magnetic tape as a recording medium has been widely used. In such a video tape recorder, a video signal and an audio signal input in a time series are demarcated in units of fields or frames of the video signal and are recorded diagonally on a magnetic tape.

[0003] In such a video tape recorder, in a camera-integrated video tape recorder driven by a battery, recording and recording standby are repeated in response to a pressing operation of a trigger switch. The rotating drum is rotated at the same rotation speed. Thus, in this type of video tape recorder, recording can be started immediately in response to a recording start operation.

In this type of camera-integrated video tape recorder, when the recording standby state continues for a certain period of time or more, the rotation of the rotating drum is stopped, thereby reducing power consumption.

On the other hand, in a personal computer, an application program or the like is recorded by using a hard disk device. In recent years, the hard disk device has been rapidly increased in density and reduced in size. It has been done.

[0006]

By the way, with respect to the recording of video signals, it is considered that a small-sized recording device capable of recording for a long time can be produced by applying a hard disk device. Further, it is considered that a recording / reproducing apparatus capable of carrying a desired image of a desired subject can be configured to be carried as in the case of a video tape recorder with a camera.

However, in such a recording / reproducing apparatus, if the hard disk is constantly rotated, there is a problem that power consumption increases.

One method of solving this problem is to stop the rotation of the hard disk when the recording standby state continues for a certain period of time, as in a video tape recorder with a built-in camera, thereby reducing power consumption. Conceivable. However, in the case of this method, there is a problem in that the imaging result cannot be recorded until the hard disk starts up to a recordable rotation speed immediately after the recording is started.

Similarly, when the rotation of the hard disk 3 is stopped to reduce the power consumption, there is a problem that the reproduction result cannot be output immediately after the start of reproduction is instructed.

The present invention has been made in consideration of the above points, and a disk device capable of recording an imaging result or the like immediately after a recording start operation while effectively avoiding an increase in power consumption. An object of the present invention is to propose a disk device capable of outputting a reproduction result even immediately after a reproduction start operation while effectively avoiding an increase in power consumption.

[0011]

In order to solve the above-mentioned problems, in the invention according to claim 1, the control means instructs the drive means to start the operation in response to the operation of the operation element or the control command. When the rotational drive of the disk-shaped recording medium is started, the input data sequentially input is controlled to be temporarily held in a buffer memory, and when the rotational speed of the disk-shaped recording medium rises to a predetermined rotational speed, the recording system operates. Is started, and control is performed so that data continuous from the data temporarily stored in the buffer memory is recorded on the disk-shaped recording medium.

Further, in the invention according to claim 4, the control means stops the output of data from the buffer memory in response to the operation of the operation element or the control command, and stores a predetermined amount of data in the buffer memory. Then, the drive unit is instructed to stop the operation and is controlled to stop the rotation of the disk-shaped recording medium. Also, this control means
In response to the operation of the operation element or the control command, the transmission of the data stored in the buffer memory is started, and the start of the operation is instructed to the drive means to start the rotation drive of the disk-shaped recording medium. When the rotation speed rises to a predetermined rotation speed, the reproduction system is instructed to start the operation.

In the configuration according to the first aspect, the control means instructs the drive means to start the operation in response to the operation of the operation element or the control command, thereby starting the rotation of the disk-shaped recording medium. If necessary, the disk-shaped recording medium is driven to rotate, thereby reducing power consumption. Also, the input data sequentially input is temporarily stored in the buffer memory, and when the rotation speed of the disk-shaped recording medium rises to a predetermined rotation speed, the start of the operation is instructed to the recording system, and the data continuously stored in the buffer memory is continuously output. By recording the data to be recorded on the disk-shaped recording medium, it is possible to temporarily store the data in the buffer memory until the disk-shaped recording medium becomes rotatable as necessary and becomes recordable, and thereafter record the data. Thus, when the start of recording is instructed, data immediately after the instruction can be recorded.

According to a fourth aspect of the present invention, the control means instructs the driving means to stop the operation and stops the rotation of the disk-shaped recording medium in response to the operation of the operation element or the control command. Similarly, in response to the operation of the operation element or a control command, the drive means is instructed to start the operation and the rotation drive of the disk-shaped recording medium is started to rotate the disk-shaped recording medium as necessary. Drive, thereby reducing power consumption.
When controlling the rotation of the disk-shaped recording medium in this way,
In response to an operation of a control or a control command, the output of data from the buffer memory is stopped, and when a predetermined amount of data is accumulated in the buffer memory, the drive unit is instructed to stop the operation and the disk-shaped recording is performed. By stopping the rotation of the medium, data to be subsequently reproduced can be read ahead and held in the buffer memory. Also, this control means
Similarly, in response to the operation of the operation element or the control command, the transmission of the data stored in the buffer memory is started, and the start of the operation is instructed to the drive means to start the rotation drive of the disk-shaped recording medium, and When the rotation speed of the disk-shaped recording medium rises to a predetermined rotation speed, the reproduction system is instructed to start the operation, and after the rotation of the disk-shaped recording medium is started, the data is pre-read and held until reproduction becomes possible. When the playback data is sent and playback start is instructed,
Immediately after this instruction, the reproduced data can be output immediately.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(1) Configuration of Embodiment FIG. 2 is a block diagram showing a hard disk drive according to an embodiment of the present invention. This hard disk device 1
Is mounted on an imaging device, a set-top box, etc.,
The video signal and the audio signal output from these devices are recorded. In addition, in a state of being attached to these devices or being detached from these devices and being attached to another AV device, it reproduces and outputs the recorded video signal and audio signal.

For this reason, the hard disk drive 1 is detachably held in the AV equipment 2 such as an image pickup device and a set-top box, and data (hereinafter, referred to as AV data) obtained by compressing video data and audio data in a predetermined format. ) Is input / output to / from these AV devices 2, and control commands, status data, addresses, etc. associated with input / output of these AV data are input / output to / from these devices. Further, the AV data is recorded on the hard disk 3, and the AV data recorded on the hard disk 3 is reproduced and output.

Here, the hard disk 3 is formatted as shown in FIG. That is, the hard disk 3
Divides the information recording surface into an inner peripheral area and an outer peripheral area,
The inner area is allocated to the system entry area. Further, the outer peripheral area is allocated to the data area.

The data area is subdivided into clusters, and AV data is recorded in each cluster in units of a data amount of a predetermined number of frames.
In this embodiment, the hard disk 3 has M
When recording AV data compressed in the format of PEG (Moving Picture Experts Group),
One GOP of AV data is allocated to one cluster.

The data area is assigned a block number, which is the address of each cluster, and can be accessed in cluster units based on this block number. In this embodiment, the block number is shown in a 4-digit hexadecimal format.

On the other hand, the system entry area further includes a boot area and a FAT (Fail Allocation
ble) area and a directory area, and in the boot area, data necessary for starting up the hard disk 3 is recorded. On the other hand, F
In the AT area and the directory area, address information and the like necessary for accessing the AV data recorded in the data area are recorded.

That is, in the directory area, the file name of each file recorded in the data area, the block number of the first block which is the recording start position of each file, and the like are recorded. On the other hand, in the FAT area, a block number and the like of each block continuous to the head block of each file are recorded. Thereby, the hard disk 3
After detecting the head block number of the desired file name from the directory area, the block numbers following the head block number are sequentially detected from the FAT area so that the addresses of consecutive clusters constituting one file can be detected. It has been done.

In FIG. 3, when the file 1 is recorded in the clusters having the block numbers 1234h to 1240h in the data area, the code indicating the block number 1234h of the first block of the file 1 is stored in the directory area. , And a block number subsequent to the block number 1234h is sequentially recorded in a corresponding area of the FAT area. In FIG. 3, EOF (End Of File) is
This is identification information indicating the last block of one file.

More specifically, the directory area is:
File management data having the configuration shown in FIG. 4 is recorded for each file recorded in the data area. That is, in the file management data, the file name is assigned to the first 8 bytes, and the extension of each file is assigned to the next 3 bytes. Data indicating the attribute of the file is assigned to the next 1 byte, and the next 10 bytes are assigned to the data for reservation. The next two bytes are assigned to the data of the recording start time, the next two bytes are assigned to the data of the recording date and time, and the next two bytes are assigned the cluster number which is the head block number. Note that data of the file length is allocated to the last four bytes.

On the other hand, in the FAT area (FIG. 3), block addresses are allocated in correspondence with the block numbers (cluster numbers) of the data area, and the block numbers of clusters following each block address are recorded. ing. Further, as shown in FIG. 5, among codes not allocated to these block numbers, predetermined codes are allocated to identification information indicating a free area, a defective cluster, and EOF, respectively.

Thus, the hard disk 3 can access the FAT area to detect a free area in the data area.

Interface control circuit (IF control) 4
(FIG. 2), for example, SCSI (Small Computer System)
Interface) Controller, IDE (Intelligent Driv)
e Electronics) The data, control commands,
Construct an input / output circuit such as an address. Buffer memory 5
Temporarily holds AV data input and output between the hard disk control circuit 6 and the interface control circuit 4.

The servo circuit 7 drives the motor (M) 8 under the control of the hard disk control circuit 6, thereby driving the hard disk 3 to rotate at a predetermined rotation speed.
The servo circuit 7 similarly drives the motor (M) 9 to seek the magnetic head, and further performs tracking control.

Under the control of the hard disk control circuit 6, the read data channel section 10 adds an error correction code to the AV data input from the hard disk control circuit 6 during recording, and uses a method suitable for the characteristics of the recording / reproducing system. The encoding process generates bit sequence data, and the magnetic head is driven by the data. At the time of reproduction, the read data channel unit 10 performs signal processing on a reproduction signal obtained from the magnetic head to generate reproduction data, and performs error correction processing on the reproduction data to reproduce AV data and reproduce the AV data. Output to

The hard disk control circuit 6 is a controller for controlling the operation of the hard disk device 1.
The whole operation is controlled by analyzing a control command input from the interface control circuit 4 and executing a predetermined processing procedure according to the analysis result.

In this control, when a recording command is input from the AV device 2, the hard disk control circuit 6 executes the processing procedure shown in FIGS. That is, the hard disk control circuit 6 proceeds from step SP1 to step SP2, and determines whether or not a recording command has been input. If a negative result is obtained, the process proceeds to step SP2.
repeat.

On the other hand, when a recording command is input, the process proceeds from step SP2 to step SP3, where the operation of the servo circuit 7 is controlled to start the rotation of the hard disk 3. Subsequently, the hard disk control circuit 6 proceeds to step SP4, where the interface control circuit 4
Sends status data to the AV device 2 via the
Instructs the start of data output. The hard disk control circuit 6 starts storing the sequentially input AV data in the buffer memory 5, and determines whether or not the hard disk 3 has risen to the steady state rotational speed at which recording and reproduction can be performed in the subsequent step SP5.

If a negative result is obtained here, the hard disk control circuit 6 repeats step SP5, thereby accumulating the sequentially input AV data in the buffer memory 5, while keeping the rotation speed of the hard disk 3 at a steady rotation speed. Wait to get up. On the other hand, when the rotation speed of the hard disk 3 rises to a steady rotation speed, the hard disk control circuit 6 proceeds to step SP6, where the transfer speed is several times as large as the transfer speed of the AV data input from the AV device 2. High speed buffer memory 5 by
Recording of the AV data stored in the.

Thus, the hard disk control circuit 6
Until the recording of the AV data is instructed, the rotation of the hard disk 3 is controlled to stop to reduce the power consumption. A
When the recording of the V data is instructed, the AV data is temporarily stored in the buffer memory 5 until the rotation of the hard disk 3 is started and the steady state is reached, and then recorded on the hard disk 3. The hard disk control circuit 6
Is designed to prevent an increase in power consumption and to record an imaging result or the like immediately after a recording start operation.

When the recording of the AV data recorded in the buffer memory 5 is started in this way, the hard disk control circuit 6 proceeds to step SP7, where it judges whether or not the stop of the recording is instructed by the AV device 2. . If a negative result is obtained here, the hard disk control circuit 6 proceeds to step SP8, and determines whether or not the data amount of the buffer memory 5 has become equal to or less than a certain value. The hard disk control circuit 6 determines the data amount of the buffer memory 5 based on the address management of the buffer memory 5.

If a negative result is obtained here, the hard disk control circuit 6 returns to step SP6 and subsequently records the AV data stored in the buffer memory 5 at a high speed. Thereby, the hard disk control circuit 6 repeats the processing procedure of steps SP6-SP7-SP8-SP6, and when the data amount of the buffer memory 5 becomes equal to or less than the predetermined value, proceeds from step SP8 to step SP9.

Here, the hard disk control circuit 6 switches the data transfer speed to the hard disk 3 to a low data transfer speed corresponding to the data transfer speed of the sequentially input AV data, whereby the data is input via the buffer memory 5. The AV data is recorded on the hard disk 3 at a data transfer speed corresponding to the AV data.

Subsequently, the hard disk control circuit 6 proceeds to step SP10, and determines whether the data amount of the buffer memory 5 has increased to a predetermined value or more. Here, for example, when the access of the replacement sector is repeated in the access of the hard disk 3 or the like, the data amount of the buffer memory 5 increases, and in this case, the hard disk control circuit 6 proceeds to step SP6 and Switch the data transfer rate to a higher transfer rate.

As a result, the hard disk control circuit 6
The sequentially input AV data is recorded on the hard disk 3. In this series of processing,
The hard disk control circuit 6 loads the data of the above-mentioned system entry area into a built-in memory in advance,
A free area is detected in accordance with the data of the loaded system entry area to control recording of AV data in cluster units, and data of the FAT area and data for file management held in the memory corresponding to the recording in cluster units are stored. Update. Further, when the recording of the AV data is completed, the system entry area of the hard disk 3 is updated with the data of the system entry area held in the memory.

In this way, when the stop of recording is instructed by the AV device 2, the hard disk control circuit 6 proceeds from step SP7 to step SP11, where the recording of the AV data temporarily stored in the buffer memory 11 is completed. This step SP11 is repeated if a negative result is obtained. On the other hand, the buffer memory 11
When the recording of the temporarily held AV data is completed, the process returns to step SP2 and waits for the subsequent operation.

7 and 8 are flowcharts showing the processing procedure of the hard disk control circuit 6 during reproduction. The hard disk control circuit 6 proceeds from step SP21 to step SP22, and determines whether or not a reproduction command has been input. If a negative result is obtained, step SP22 is repeated.

On the other hand, when a reproduction command is input, the hard disk control circuit 6 proceeds from step SP22 to step SP23, in which the operation of the servo circuit 7 is controlled to start the rotation of the hard disk 3. Subsequently, the hard disk control circuit 6 proceeds to step SP24, where it determines whether the corresponding AV data is held in the buffer memory 5 by prefetching.

Here, for example, when the operation is switched from the recording operation mode to the reproduction operation mode, a negative result is obtained in the first reproduction or the like after the power is turned on, and the hard disk control circuit 6 is step SP24
From step SP25. Here, the hard disk control circuit 6 determines whether or not the rotation speed of the hard disk 3 has risen to a steady state rotational speed at which recording and reproduction can be performed.

If a negative result is obtained here, the hard disk control circuit 6 repeats step SP25 and waits for the rotation speed of the hard disk 3 to rise to a steady rotation speed. On the other hand, when the rotation speed of the hard disk 3 rises to a steady rotation speed, the hard disk control circuit 6 proceeds to step SP26 and starts reading the corresponding AV data according to the recording in the system entry area.

Further, in the following step SP27, the hard disk control circuit 6 starts outputting the AV data read from the hard disk 3 to the AV data device 2, and then proceeds to step SP28. Here, the hard disk control circuit 6 determines whether or not the reproduction is stopped.
Here, if a negative result is obtained, the hard disk control circuit 6 repeats step SP28, and thereby, until the reproduction of the file specified by the reproduction command is completed, or a reproduction stop command is input from the AV device 2. During this time, the corresponding AV data is sequentially reproduced.

On the other hand, if a positive result is obtained in step SP28, the hard disk control circuit 6 proceeds to step SP29 and stops outputting the AV data.

Subsequently, the hard disk control circuit 6 proceeds to step SP30, where it determines whether or not the prefetched data exists on the hard disk 3. In this case, for example, the hard disk control circuit 6 waits for the playback of the AV
When a playback stop command is input, or when a playback stop command is input from the AV device 2 before the processing based on an instruction to continuously play a plurality of files is completed, for example, AV not yet played
Since the data has been recorded on the hard disk 3, a positive result is obtained in step SP30, and the routine goes to step SP31.

Here, the hard disk control circuit 6 reads AV data of a predetermined cluster subsequent to the AV data whose output has been stopped from the hard disk 3 and stores it in the buffer memory 5, and then proceeds to step SP32 to rotate the hard disk 3. Stop control is performed, and the process returns to step SP22. Accordingly, the hard disk control circuit 6 stops the rotation of the hard disk 3 when the stop of the reproduction of the AV data is instructed to reduce the power consumption. Further, by pre-reading the AV data and holding it in the buffer memory 5, it is possible to immediately output the AV data when an instruction to start reproduction is subsequently given.

That is, when an instruction to start reproduction is input in a state where the prefetched data is held in the buffer 5 in this manner, the hard disk control circuit 6 proceeds to step SP
A positive result is obtained at 24, and the routine goes from step SP24 to step SP33. Here, the hard disk control circuit 6 reads the prefetched A stored in the buffer memory 5.
After the start of the output of the V data, the process proceeds to step SP34, and it is determined whether or not the hard disk 3 has risen to a rotation speed in a steady state at which recording and reproduction can be performed.

If a negative result is obtained here, the hard disk control circuit 6 repeats step SP34 and waits for the rotation speed of the hard disk 3 to rise to a steady rotation speed. On the other hand, when the rotation speed of the hard disk 3 rises to a steady rotation speed, the hard disk control circuit 6 proceeds to step SP35, starts reading the corresponding AV data according to the recording in the system entry area, and then proceeds to step SP28. . In this case, in the hard disk device 1, the pre-read A
When the V data is transmitted to the AV device 2, the hard disk control circuit 6 determines in step SP35 the cluster following the cluster for which the pre-read has been completed as F
The operation of the servo circuit 7 is controlled so that it is detected from the AT area and the reproduction is started from the detected cluster.

In the hard disk device 1, the time required for the hard disk 3 to rise to a steady state and the data of the AV data from the AV device 2 are stored in the buffer memory 5 so that the AV data does not overflow during recording. The capacity of the buffer memory 5 is selected according to the transfer speed. At the time of reproduction, the amount of AV data read ahead and held in the buffer memory 5 is set so that the AV data is not interrupted in the buffer memory 5 having the capacity selected in this way. Will be.

If a negative result is obtained in step 30, the hard disk control circuit 6 directly proceeds to step 3.
Move to 2.

(2) Operation of Embodiment In the above configuration, the hard disk drive 1 (FIG. 2) is mounted on, for example, an imaging device, a set-top box, etc., and a recording control command is input from these AV devices 2. Then, A which is input following this control command
The V data is input to the read data channel unit 10 via the hard disk control circuit 6, where it is modulated in a format suitable for recording and the magnetic head is driven.
This is recorded on the hard disk 3.

When a playback control command is input while connected to these AV devices, or detached from these devices and attached to other AV devices, a playback command obtained from the magnetic head is obtained. The signal is processed by the read data channel unit 10 to reproduce AV data, and the AV data is output to the AV device 2 via the hard disk control circuit 6 and the interface control circuit 4.

When recording / reproducing AV data in this manner, in the hard disk drive 1, when a reproduction command by designating a file name is input, the corresponding file management data is searched from the directory area.
As a result, the head block number (head cluster number) is detected for the file instructed to be reproduced.
Further, the record of the FAT address corresponding to this block number is searched, the block number of the cluster following this head block is detected, and so on until the EOF corresponding to the end block of the file is detected by searching the FAT area in the same manner. Block numbers of consecutive clusters are sequentially detected. The hard disk device 1 reproduces the AV data sequentially from the corresponding block while detecting the block number in this manner.
Is output to

On the other hand, when recording AV data, an empty area is sequentially detected from the FAT area, and the AV data is sequentially recorded in this empty area. In addition, file management data is recorded and a FAT area is set so that the file can be reproduced by the above-described reproduction procedure, and further, that the file can be managed.

In the hard disk device 1 (FIGS. 1 and 7), the rotation of the hard disk 3 is controlled to stop when the recording and reproduction processes are not being executed, and the recording and reproduction control by the AV device 2 is performed. When the command is input, the rotation of the hard disk 3 is started. As a result, the hard disk drive 1 rotates the hard disk 3 only when necessary, and the power consumption is reduced accordingly.

However, this makes it difficult to record and reproduce data immediately after the start of the recording and reproducing operation.

In response to this problem, in the hard disk drive 1, during recording, AV data sequentially input to the buffer memory 5 until the rotation speed of the hard disk 3 rises to a steady rotation speed and becomes recordable. It is temporarily stored, and is recorded on the hard disk 3 at a high speed when it starts up in a steady state. Accordingly, for example, even when the recording is repeated by operating the trigger switch while being attached to the imaging device, it is possible to record the imaging result constituting the AV data on the hard disk 3 immediately after the operation of the trigger switch.

In the recording immediately after the start, the AV data is recorded on the hard disk 3 at a high speed, so that the capacity of the buffer memory 5 can be reduced, and further, the overflow in the buffer memory 5 can be prevented.

That is, for example, when AV data having a data transfer rate of about 1.5 [Mbit / sec], which is data compressed by MPEG, is input, it takes about 2 [seconds] for the hard disk 3 to rise to the normal rotation speed. Then, 3 [Mbit] of data is temporarily stored in the buffer memory 5. In this case, if the AV data is recorded on the hard disk 3 at a data transfer rate of 8 [Mbit / sec] after rising to a steady state, the data of 3 [Mbit] held in the buffer memory 5 becomes 0.375 [Mbit]. sec] (3 [Mbit] / 8 [M
bit / sec]), the recording is completed.

Thus, in this case, it can be seen that overflow can be prevented by allocating a capacity of 3 Mbits or more to the buffer memory 5.

On the other hand, at the time of reproduction, when reproduction is stopped, reproduction is continued even after the transmission of AV data to the AV device 2 is stopped, whereby the AV data is prefetched and held in the buffer memory 5. . When the start of the subsequent reproduction is instructed, the AV data prefetched and held in the buffer memory 5 is transmitted until the hard disk 3 becomes reproducible.

Thus, even in the case of reproduction, the hard disk drive 1 starts the rotation of the hard disk 3 in response to the control command to reduce power consumption, and can immediately transmit AV data in response to the control command. Has been made.

(3) Effects of the Embodiment According to the above configuration, during recording, the AV data is held in the buffer memory until it rises to the steady rotation speed. By recording on the hard disk 3, the rotation of the hard disk 3 is started only when necessary to reduce power consumption, and an imaging result or the like can be immediately recorded in response to a recording start operation. .

At the time of reproduction, the pre-read AV data is held in the buffer memory, and when the reproduction is instructed, the pre-read AV data is maintained until the normal rotation speed is reached.
Data is output, and when the rotation speed rises to the steady rotation speed, the reproduction of the hard disk 3 is started, and only when necessary, the rotation of the hard disk 3 is started to reduce the power consumption, thereby responding to the reproduction start operation. As a result, the imaging result and the like can be immediately reproduced.

(4) Other Embodiments In the above-described embodiment, the case where the FAT area and the directory area are arranged in the system entry area and the connected file data is recorded in the data area has been described. The present invention is not limited to this, and can be applied to a case where various areas are arranged on a recording medium as needed, and further a case where connected file data is recorded in various areas. Obtainable. In this case, for example, a case where the directory area is managed separately in a root directory and a subdirectory, and a case where the directory area is arranged in a data area are conceivable.

In the above-described embodiment, the case where AV data is recorded on the hard disk has been described. However, the present invention is not limited to this case. The present invention can be widely applied to a case where the image data is mixedly recorded, and the same effect as that of the above-described embodiment can be obtained.

In the above embodiment, the FAT
Although the case where the data area of the hard disk 3 is managed by the file system has been described, the present invention is not limited to this, and can be widely applied to the case where the data area is managed by various management file systems.

Further, in the above-mentioned embodiment, the case where the present invention is applied to a removable hard disk device has been described. However, the present invention is not limited to this, and a phase change optical disk device, an optical disk device using thermomagnetic recording, etc. It can be widely applied to various disk devices.

[0071]

As described above, according to the present invention, during recording,
Until the rotation speed of the disk-shaped recording medium becomes a writable rotation speed, data to be recorded is temporarily held in a buffer memory, thereby effectively avoiding an increase in power consumption and immediately after the operation of starting recording. Can also record an imaging result and the like.

At the time of reproduction, the pre-read data held in the buffer memory is output until the rotational speed of the disk-shaped recording medium becomes a reproducible rotational speed.
By effectively avoiding an increase in power consumption, a reproduction result can be output immediately after the operation of starting reproduction.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a recording procedure of a hard disk control circuit in a hard disk device according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating an overall configuration of a hard disk device.

FIG. 3 is a table for explaining a recording area of a hard disk in the hard disk device of FIG. 2;

FIG. 4 is a table showing file management data recorded in a directory area of FIG. 3;

FIG. 5 is a table showing codes recorded in a FAT area of FIG. 3;

FIG. 6 is a flowchart showing a processing procedure following FIG. 1;

FIG. 7 is a flowchart showing a processing procedure at the time of reproduction of the hard disk control circuit of FIG. 2;

FIG. 8 is a flowchart showing a processing procedure following FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hard disk device, 2 ... AV equipment, 3 ... Hard disk, 5 ... Buffer memory, 6 ... Hard disk control circuit

Claims (5)

[Claims] 1. A disk drive for rotating a disk-shaped recording medium to record desired data on the disk-shaped recording medium, comprising: a driving unit for rotating and driving the disk-shaped recording medium; and a predetermined data output unit. A buffer memory for temporarily holding and outputting the output data, a recording system for recording the data output from the buffer memory on the disc-shaped recording medium, and operations of the driving unit, the buffer memory, and the recording system In response to an operation of a control or a control command, the control unit instructs the drive unit to start an operation and starts the rotation drive of the disk-shaped recording medium, Controlling the data to be sequentially input to be temporarily stored in the buffer memory; A disk drive for instructing the recording system to start operation when the rotation speed rises, and controlling the data to be recorded on the disk-shaped recording medium, the data being continuous from the data temporarily stored in the buffer memory. . 2. The data transfer rate of the data to be recorded on the disk-shaped recording medium by the recording system according to the data amount of the data held in the buffer memory. The disk device according to claim 1, wherein: 3. The apparatus according to claim 2, wherein the disk device is detachably held in a predetermined video device, the data output means is the video device, and the data is video data output from the video device. 2. The disk device according to claim 1, wherein: 4. A disk device for rotating a disk-shaped recording medium to reproduce data recorded on the disk-shaped recording medium, comprising: a driving unit for rotating and driving the disk-shaped recording medium; A reproduction system for processing the reproduction signal obtained and outputting the data; a buffer memory for temporarily holding and outputting the data output from the reproduction system; and a driving unit, the buffer memory, and the reproduction system. Control means for controlling an operation, wherein the control means stops outputting the data from the buffer memory in response to an operation of an operation element or a control command, and stores the data in the buffer memory by a predetermined amount. When the data is accumulated, the driving means is instructed to stop the operation and the control is performed so as to stop the rotation of the disk-shaped recording medium. Responds to a control command, starts sending data stored in the buffer memory, instructs the driving means to start operation, starts up the rotation drive of the disk-shaped recording medium, When the rotation speed rises to a predetermined rotation speed,
A disk device for instructing the reproduction system to start an operation. 5. The disk device according to claim 4, wherein the disk device is detachably held by a predetermined video device, and outputs the output data of the buffer memory to the video device.