JPS634463A - Alternative processing system for magnetic recording medium area - Google Patents

Abstract

PURPOSE:To simplify the retrieval processing after alternative processing by clearing information of error occurrence locating, abolishing write/management of alternating destination information and applying alternative processing thereby preventing the disabled processing if an error takes place in the write/read of the alternating destination information. CONSTITUTION:In reading a data by a read circuit 2 from a magnetic disk device area 1 being a recording medium written with data, if an error takes place, a central processing unit 4 commands the alternating processing to a write/read control circuit 5 as a result of various processings. The write/read control circuit 5 issues a command of performing the erasure processing of a sector having an error and the alternating processing of the sector having the error to a sector not in use of a predetermined alternating sector or alternating track to a write/erasure circuit 7 via a write data generating circuit 6. The write/erase circuit 7 erases the sector in error of the magnetic disk device area 1 and writes ID information or the like to the alternating area.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to alternative processing of an error occurrence location in a magnetic recording medium area, and in particular, processing by abolishing writing φ management of alternative destination information. The present invention relates to an alternative processing method that is simple and suitable for preventing alternative processing from becoming impossible.

[Conventional technology]

In the conventional method, as in the 2-sei method disclosed in Japanese Patent Application Laid-open No. 55-38660, an alternative security guard for a defective sector is provided on the same track, and flag information indicating that the sector is defective is written in the defective sector. . However, no consideration was given to the fact that if an error occurs in the extraction of flag information written in a bad sector, alternative processing (alternative processing) may not be possible.

[Apex while the invention is trying to solve]

The above-mentioned conventional technology provides 71 steps regarding processing when writing/reading of replacement destination information in a magnetic recording medium area becomes impossible.
There was a problem that error recovery was not possible because g had not been done.

The purpose of this invention is to prevent processing failure when an error occurs in writing/reading replacement destination information in alternative processing for an error location in the error recording medium area, and to simplify search processing after the alternative processing. There is a particular thing.

[Means for solving problems]

The above purpose is to abolish the management of alternative destination information and clear the error location (erase, gap write, etc.)
Then, by sequentially performing substitution processing in the substitution area, it can be captured in succession.

[Effect]

Alternative processing for the error occurrence area in the magnetic recording medium area is to clear the error occurrence area (erase, gap write, etc.)
Then, alternate processing (write) operations are sequentially performed in the alternate area.

Is the successive operation after the alternative processing from the relevant palace to the alternative area? :
She looks around and makes continuous movements. This eliminates the need for writing and managing the replacement destination information, thereby preventing processing failure when an error occurs in writing/reading the replacement destination information, and also simplifies the read processing after the replacement processing.

[Implementation row]

Hereinafter, one embodiment of the present invention will be explained starting from the first pressure. 1st
The figure is a schematic diagram of replacement processing for the magnetic disk device area, which is a series of replacement processing for the magnetic recording medium area. Conventionally, during alternative processing, alternative information was written and managed in a certain area, but if an error occurred in that area, alternative processing could not be performed (which led to data file destruction.The alternative processing method according to the present invention In order to prevent this data file from being destroyed and to simplify the processing, we have developed an alternative processing method in which the processing is performed in the following order.

■Clear the sector where a read error occurred (erase,
gap writing, etc.).

■Allocate the sector where the error occurred to an alternative sector. (
In case of A-2 sector) If the alternative sector is already used, it is allocated to an unused sector of the alternative track. (In the case of sector B-2) (1) In the read operation of a sector that has been substituted, the track corresponding to the sector is read and the sector is searched for.

■If the corresponding sector does not exist on that track, search the alternative track and perform a read operation.

As a result, it is possible to write the alternative information without filling it (@'f), and it is possible to prevent the failure of alternative processing in the event of an error in storing/repeating the alternative information, and to simplify the alternative processing.

FIG. 2 shows an example of a circuit block according to an embodiment of the present invention. In FIG. 2, when an error occurs when reading data in the reading circuit 2 from the S-disk device area 1, which is a recording medium in which data has been written, the central processing unit 4 performs write/read control as a result of various processes. Instructs circuit 5 to perform alternative processing. The write/read control circuit 5 erases the sector in which the error has occurred, and writes/writes the sector in which the error has occurred to a predetermined alternative sector or an unused sector of the alternative track via the write data generation circuit 6. Instruct the erase circuit 7. Write command erase circuit 7
erases the error sector in the magnetic disk drive area 1 and writes ID information, etc. to the alternative area. Data writing/reading of sectors including the substituted sector is performed by the readout circuit 2, which causes the write/read control circuit to search the track of the designated sector and the substitute track to find the corresponding sector, in response to instructions from the central processing unit 4. and instructs the data search/discrimination circuit 3 to perform write/display processing.

〔Effect of the invention〕

According to the present invention, there is no need to write and manage replacement destination information in the magnetic dual media area, thereby preventing processing failure due to errors in the replacement destination information expansion area and simplifying read processing after replacement processing. There is an effect that can be done.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the magnetic disk drive area before and after replacement processing according to an embodiment of the present invention, and FIG. 2 is a circuit block diagram used in the embodiment of FIG. 1. DESCRIPTION OF SYMBOLS 1...Magnetic disk drive area, 2...Continuation circuit, 3...Data search/discrimination circuit, 4...Central processing unit, 5...Reading during writing control circuit, 6...Writing Data generation circuit, 7...Write/erase circuit. ″

Claims (1)

[Claims] 1. A magnetic recording medium characterized by clearing the information at the error location, abolishing the writing and management of replacement destination information, and performing alternative processing in an alternative processing method for an error occurrence location due to a bad spot or the like on a magnetic recording medium. Alternative treatment methods for areas. The alternative processing method for a magnetic recording medium area is characterized in that the read operation under this alternative processing method includes a method of sequentially searching and reading from the relevant area to the alternative area.