JPH06282384A - Disk drive control system - Google Patents

Abstract

PURPOSE:To provide the disk drive control system which restores data in an error occurrence position at the time of data read from a disk drive medium even in the case that a defect in the error occurrence position on the disk drive medium is made graver by the secular change or the like. CONSTITUTION:A disk drive 1 which has a cache memory 4 between a system host 2 and a disk drive medium 3 to transfer data is provided with a flash memory 5 where data in the error occurrent position at the time of data write to the disk drive medium 3 is stored, and data in the error occurrence position is read out from the flash memory 5 when data is read out from the disk drive medium 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive control system for controlling data transfer between a host system and a disk drive medium.

[0002]

2. Description of the Related Art Normally, a disk drive transfers data between a disk drive medium and a host system via a memory. When a write error occurs at the time of writing data to the disk drive medium, the data at the error location is saved by the retry process.

[0003]

However, in the conventional case, since the defect at the error occurrence point is initially small, even if the data at the error occurrence point can be saved by the retry process, the defect changes over time. If it becomes larger due to such reasons, it becomes impossible to save even if the data at the error location is retried. Therefore, when reading data from the disk drive medium, it is impossible to recover the data at the location where the error occurred.

The present invention has been made by paying attention to the above-mentioned circumstances, and an object of the present invention is to make a disk even if a defect at an error occurrence place on a disk drive medium becomes large due to aging. An object of the present invention is to provide a disk drive control method capable of recovering data at an error occurrence point when data is read from a drive medium.

[0005]

In order to achieve the above object, the present invention provides a disk drive that transfers data between a host system and a disk drive medium via a memory, and writes data to the disk drive medium. A flash memory for storing the data of the error occurrence point is provided, and when the data is read from the disk drive medium, the data of the error occurrence point is controlled to be read from the flash memory.

[0006]

According to the disk drive control method of the present invention, when a write error occurs when writing data to the disk drive medium, the data at the error location is stored in the flash memory, while the flash data is read when reading data from the disk drive medium. Since the data at the error occurrence point is controlled to be read from the memory, even if the defect at the error occurrence point on the disk drive medium becomes large due to aging, etc., the data at the error occurrence point will be read when the data is read from the disk drive medium. Can be restored.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a functional block diagram showing an outline of main parts of a system configuration of an embodiment to which a disk drive control system of the present invention is applied.

Also in this embodiment, the disk drive 1 can transfer data between the host system 2 and the disk drive medium 3 via the cache memory 4. Therefore, normally, the host system 2
The data sent from the host system 2 to the disk drive medium 3 is written by writing the data sent from the disk drive 1 addressed to the disk drive 1 to the cache memory 4 and then reading the data from the disk drive medium 3.
Stored in.

However, when a write error occurs at the time of writing data to the disk drive medium 3 and the defect at the error occurrence point is large, and the data at the error occurrence point cannot be saved even by retry processing, the host system 2 If the system configuration is such that the cache memory 4 is only interposed between the disk drive medium 3 and
When reading data from the disk drive medium 3, the data at the location where the error occurred cannot be recovered.

Therefore, in this embodiment, the disk drive 1
In addition, the flash memory 5 is provided to store the data of the error occurrence point at the time of writing the data to the disk drive medium 3, while the disk drive medium 3 has the error occurrence point at each error occurrence point at the data writing time. As a flag means for monitoring the data read time, the management information section 7 of each of the blocks 6 _{0 to} 6 _n has an address section 8 and an error flag 9 so that each block 6 ₀
The data section 10 can be managed by the error flag 9 every 6 _n .

Accordingly, in this embodiment, when data is written to the disk drive media 3, if the defect write error occurs (retry process is enabled or disabled defect) is for example the block 6 _0, the block 6 ₀ At the same time as writing the data, the process of writing the data and the management information in the flash memory 5 is executed. In addition, block 6 ₀
The process of setting the error flag 9 of the management information 7 of 7 is simultaneously executed.

As described above, by simultaneously writing data in the disk drive medium 3 and the flash memory 5, even if an abnormality occurs in the disk drive medium 3, the data will not be lost.

After that, when the error flag 9 is constantly monitored and the data is written in the address portion 8 in which the error flag 9 is set, the processing for updating the data in the flash memory 5 is always executed.

Next, when data is transferred from the disk drive 1 to the host system 2, a data read process for the disk drive medium 3 is executed. When this data read is made to for example block 6 _0,
Since the error flag 9 is constantly monitored, if the error flag 9 is set, data is transferred from the flash memory 5 to the host system 2. If the management information section 7 cannot be read, the management information in the flash memory 5 is checked, and if the address requested by the host system 2 and the address in the flash memory 5 match, the match is sent to the host system 2. Data at the viewed address (data at the location where the error occurred is transferred from the flash memory 5 to the host system 2).

As described above, since the flash memory 5 is used for storing data at an error occurrence point when a write error occurs, the disk drive 1 to which the present invention is applied is reliable in writing and reading data. It will be extremely expensive. Further, since the error occurrence status is stored in the flash memory 5, there is an advantage that the host system 2 side can confirm the progress of the error by directly reading the information in the flash memory 5 from the host system 2. .

[0016]

As described above, according to the present invention, when a write error occurs at the time of writing data to the disk drive medium, the data at the error occurrence point is irrespective of whether the defect at the error occurrence point is retryable or not. Is written to the flash memory, and when the data is read from the disk drive medium, the data at the error occurrence point is read and transferred to the host system, so there is no effect that defects at the error occurrence point change over time. A disk drive can be used. Therefore, the reliability of the disk drive is significantly improved.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an outline of a main part of a system configuration of an embodiment to which a disk drive control system of the present invention is applied.

[Explanation of symbols]

1 disk drive 2 host system 3 disk drive medium 4 cache memory 5 flash memory 6 _{0 to} 6 _n each block of flash memory 7 management information part 8 address part 9 error flag 10 data part

Claims (1)

[Claims] 1. A disk drive that transfers data between a host system and a disk drive medium via a memory is provided with a flash memory for storing data at an error occurrence point when data is written to the disk drive medium, A control method for a disk drive, wherein when the data is read from a disk drive medium, the data at the error occurrence location is controlled to be read from the flash memory.