JPH06208769A - Disk recorder - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a disk recording device used in an information processing system, and particularly to provide a concrete means for shortening a substantial seek time and speeding up a writing / reading process. With the goal. [Structure] When a command cannot be written when a command is received from the host, the head is moved to the seek position according to the command, and data processing is performed to write data information to a predetermined sector in sector units. In a disk recording apparatus that collectively performs writing alternative processing on sectors of an alternative track in accordance with the allocation of the alternative sector allocation means after writing processing to a normal sector is performed, It is characterized in that the seek position is predicted, and the head is moved to the predicted seek position before the next command from the host is received.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording apparatus used in an information processing system, and particularly, to provide a concrete means for shortening a substantial seek time and speeding up a writing / reading process. To do.

[0002]

2. Description of the Related Art In recent years, if the alternative sector processing is performed every time a defective sector is detected, an extra seek processing occurs and high-speed data processing cannot be performed. Therefore, the head after the writing / reading processing of the data information to the normal sector is performed. Is sought to the alternative track and processed in a batch.

The conventional alternative sector processing will be described below. FIG. 6 shows a block diagram of a conventional disc recording apparatus. A control unit 61 receives commands from the host and controls various processes in accordance with the instructions. If it is a write or read command, it controls the write or read processing of the specified sector with respect to the disk recording means 65. If the specified sector is defective and the above processing is impossible, the above processing is assigned to the alternative track.
Reference numeral 62 denotes a buffer memory unit, which is a data buffer for temporarily storing the sector data designated by 61 before writing or reading to the disk recording means 65, an alternative sector management table for storing alternative sector information when a defective sector is detected, It has a defective sector address buffer. Reference numeral 63 denotes an alternative sector allocation means, which allocates an available alternative sector under the control of the control unit 61 and passes the alternative address to the control unit 61. Reference numeral 64 denotes an alternative processing batch means that collectively executes the alternative processing using the alternative sector information under the control of the control unit 61.

The alternative sector processing of the disk recording apparatus configured as described above will be described. FIG. 7 shows an alternative batch process using the alternative process management table.

First, the writing process will be described. A data buffer 71 and an alternative sector management table 72 are provided in the buffer memory unit 62. Disk recording means 6 from host
All the data to be written in 5 are sequentially stored in the data buffer 71. After that, the data is written in the designated addresses of the disk recording means 65 in the order of storage in units of one sector. When there is a defective sector that cannot be written, the data buffer pointer of the defective sector, the physical address designated by the host, and the alternate sector physical address are stored in the alternate sector management table 72 each time. After the writing process to the disk recording unit 65 other than the defective sector is completed, the head is sought to the alternative track and the alternative sector management table 72 is referred to to find the defective sector data d1 and d2 remaining in the data buffer 71 at the alternative sector physical address. Write in bulk.

Next, the reading process will be described. The buffer memory unit 62 is provided with a data buffer 71, a substitute sector management table 72, and a defective sector address buffer 73. Data is read from the disk recording means 65 to the host one sector at a time and stored in the data buffer 71 in order. If there is a sector that cannot be read out, the defective sector physical address of the sector is stored in the defective sector address buffer 73. After the reading process from the normal sector is completed, the head is sought to the alternative track, the alternative sector management table is referred using the defective sector physical address of the defective sector address buffer 73, and the data buffer 71 is read from the alternative sector physical address. Are collectively read into the defective sector data areas d1 and d2 remaining in the memory area, and all the data in the data buffer 71 are read out to the host in the order of storage.

[0007]

However, in the above-mentioned conventional alternative sector processing method, since the head is on the alternative track after the completion of the alternative processing, the sequential write / read processing is continuously instructed by the host. To
If the defective sector is detected, there is a problem that a seek process from the alternative track to the track on which the pre-write / read process is performed is required at the next write / read process.

The present invention solves the above-mentioned problems of the prior art by predicting the seek position at which the host will access the disk recording means next, and after the alternative sector processing and before the next processing instruction from the host. An object of the present invention is to provide a high speed writing / reading process by automatically seeking the head of the disk recording means to a predicted seek position.

[0009]

In order to achieve this object, a disk recording apparatus of the present invention receives a command from a host, moves a head to a seek position corresponding to the command, and then a sector of a predetermined track. When writing / reading data information in units of sectors, if there is a sector that cannot be written / read out,
In a disk recording device, after writing / reading to / from a normal sector is performed, writing / reading alternative processing is collectively performed on sectors of another alternative track according to the allocation of the alternative sector allocation means. After the substitution process, the next seek position is predicted, and the head is moved to the predicted seek position before receiving the next command from the host.

[0010]

With this configuration, the head of the disk recording means is automatically sought to the predicted seek position before receiving the processing instruction from the host, so that the host successively issues the sequential write / read processing. In this case, even if the defective sector is detected in the previous processing step, unnecessary seek processing is less likely to be performed during processing, and the write / read processing can be speeded up.

[0011]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of a disk recording apparatus.
A control unit 11 receives a command from the host and controls various processes according to the instruction. If it is a write or read command, it controls the write or read processing of the specified sector with respect to the disk recording means 17. If there is a defective sector and the above processing cannot be performed, the above processing is assigned to the alternative track. 12 is a buffer memory unit,
A data buffer for temporarily storing the sector data designated by the control unit 11 before writing or reading to the disk recording means 17, a substitute buffer for storing substitute sector information when a defective sector is detected, and a buffer for storing seek position prediction data. Have.

Reference numeral 13 is an alternative sector allocation means, which allocates an available alternative sector under the control of the control unit 11 and passes the alternative address to the control unit 11. Reference numeral 14 denotes an alternative processing batch means which collectively executes the alternative processing using the alternative sector information under the control of the control unit 11. Reference numeral 15 is a seek position predicting means for predicting a position to be next sought from a command previously instructed by the host. 16
Is an automatic seek means, after the alternative batch processing, before the next command instruction from the host, the head of the disk recording means,
Under the control of the control unit 11, automatic seek is performed at the predicted seek position.

The operation of the disk storage device configured as described above will be described below. FIG. 2 is a processing flow of the seek position prediction means 15 of the present invention.

The control unit 11 receives a command from the host (21) and performs write / read processing and the like according to the command instruction (22). It is checked whether or not the seek processing of the head has occurred in the disk recording means 17 (23), and if it has occurred, the current access address and the number of processing sectors are sequentially stored (24). Then, the address is compared with the access address and the number of processing sectors stored at the time of the previous seek processing occurrence (25), and the access address at the time of the current seek processing is larger than the previous access address and the address obtained by adding the number of preprocessing sectors to the previous access address. In the case of the following, it is determined that sequential write / read processing is continuously occurring from the host, and the track No. having the current access address in the seek position prediction data. Is stored (27). If a command for which seek processing has not occurred is received and the above comparison conditions are not satisfied, it is determined that sequential access processing has not occurred from the host,
Since the next seek position cannot be predicted, the seek position prediction data is cleared (26).

FIG. 3 shows a processing flow when a write command is received from the host of the present invention. The buffer memory unit 1 stores sector data to be written from the host to the disk recording means 17.
Sequentially store in the data buffer that secures the area in 2 (3
1). The head of the disk storage means 17 is sought to the track instructed by the host to perform the writing process (32), and it is checked whether the sector data can be written in the designated sector (33). If it is writable, the data is written in the designated sector of the disk recording means 17 in the order of storage in units of one sector (3
4). If it is not writable, the alternative sector information is stored in the alternative sector buffer secured in the buffer memory unit 12 (35). The above process is repeated until the writing process of all the sector data and the storing process of the alternative sector buffer instructed by the host are completed (36).

When the writing process of the disk recording means 17 is completed, the head of the disk storage means 17 is sought to the alternative track (37), and the defective sector data still stored in the data buffer is used by using the alternative sector information. The alternative processing is completed by collectively writing (38) to the alternative address allocated by the alternative sector allocation means 13, and the completion of the writing processing is reported to the host. FIG. 5 is an explanatory diagram of an alternative process of the disk recording means 17 at the time of the above process. 5
Reference numeral 1 is a track for which a writing process is instructed by the host. In this case, 8 sectors of data are written in the track. Here, the defective sector 52 is detected in the writing process of the seventh sector.

After the writing process to the track is completed, the head seeks to the alternative track 53 and the alternative sector allocation means 1
The defective sector data is collectively written in the alternative sector 54 allocated in 3. The above process is the same as the conventional process.
Before the next processing instruction is issued from the host, the head of the disk recording means 17 is automatically sought on the seek position predicted in FIG. 2, that is, the track 51 (39). At this time,
If the seek position prediction data is cleared, it indicates that the seek position could not be predicted, and the head stops at the current seek position, that is, the track 53.

FIG. 4 shows a processing flow when a read command is received from the host of the present invention. The head of the disk storage means 17 is sought to the track instructed to be read by the host (41), and it is checked whether the designated sector data can be read (42). If the data can be read, the data is stored in order from the data recording means 17 in units of one sector in the data buffer secured in the read buffer memory section 12 (43). If it cannot be read, buffer memory unit 1
The alternative sector information is stored in the alternative sector buffer whose area is secured in 2 (44). The above process is repeated until the process of reading all the sector data and the process of storing the alternative sector buffer instructed by the host are completed (45). When the reading process of the disk recording means 17 is completed, the head of the disk storage means 17 is sought to the alternative track (46), and the alternative sector information is used to create the data buffer from the alternative address assigned by the alternative sector assigning means 13. The alternative process is completed by reading (47), and the data in the data buffer is read in the storage order to the host (4
According to 8), the completion of the reading process is reported to the host.

FIG. 5 shows the disk recording means 17 during the above processing.
FIG. 8 is an explanatory diagram of an alternative process of FIG. Reference numeral 51 denotes a track for which a read processing instruction has been issued by the host.
Data for the sector is being read. Here, the defective sector 52 is detected in the reading process of the seventh sector. After the reading process to the data buffer is completed, the head seeks to the alternative track 53 and the defective sector data is collectively read from the alternative sector 54 allocated by the alternative sector allocation means 13. Before the next processing instruction is issued from the host, the head of the disk recording means 17 is automatically sought on the seek position predicted in FIG. 2, that is, the track 51 (49). At this time, if the seek position prediction data has been cleared, it indicates that the seek position could not be predicted, so the head stops at the current seek position, that is, on the alternative track 53.

After the write / read processing, if the next processing instruction from the host is to access the previous track, it is not necessary to perform an extra seek operation during the processing execution.

[0022]

As described above, according to the present invention, the seek position predicting means is used to automatically seek the head of the disk recording means before the processing instruction from the host, so that the sequential write / read processing from the host is continued. Even if a defective sector is detected when instructed, it is not necessary to perform extra seek processing during processing, and it is possible to realize an excellent disk recording device that can speed up write / read processing. is there.

[Brief description of drawings]

FIG. 1 is a block diagram of essential parts showing an embodiment of a disk recording apparatus of the present invention.

FIG. 2 is a processing flow chart of a seek position prediction means in the embodiment.

FIG. 3 is a processing flow chart in writing processing execution of the embodiment.

FIG. 4 is a processing flow chart in read processing implementation of the embodiment.

FIG. 5 is an explanatory view of an alternative processing operation of the disk recording means in the embodiment.

FIG. 6 is a block diagram showing a main part of a conventional disc recording device.

FIG. 7 is an explanatory diagram of an operation of alternative batch processing using a conventional management table for alternative processing.

[Explanation of symbols]

 11 Control Unit 12 Buffer Memory Unit 13 Alternate Sector Allocation Means 14 Alternate Processing Batch Means 15 Seek Position Prediction Means 16 Automatic Seek Means 17 Disk Recording Means

Front page continuation (72) Inventor Masayoshi Toyota 2-10, Shoucho, Takamatsu City, Kagawa Prefecture Matsushita Kotobushiki Kogyo Co., Ltd. (72) Inventor Hiromi Kuwahara 2-10, Shoucho, Takamatsu City, Kagawa Prefecture Kotobuki Electronics Industry Co., Ltd.

Claims (2)

[Claims] 1. A command is received from a host, the head is moved to a seek position according to the command, and data information is written in sector units of a predetermined track in sector units.
When performing the reading process, if there is a sector in which the writing / reading process is impossible, after each writing / reading process to a normal sector, another replacement is performed according to the allocation of the alternative sector allocation means. In a disk recording apparatus that collectively performs writing / reading alternative processing on each sector of a track, the next seek position is predicted after the alternative processing, and the predicted seek is performed before the next command from the host is received. A disk recording apparatus, wherein the head is moved to a position. 2. The seek position is predicted when the address accessed by the last command is less than or equal to the sum of the accessed address of the previous command and the number of processing sectors and is larger than the accessed address of the previous command. A disk recording apparatus characterized in that a track having an address accessed by a command is set as a predicted seek position.