JPH01151072A - Block attribute identifying system - Google Patents

Abstract

PURPOSE:To control a magnetic disk device to need the control of writing prohibition and reading prohibiting at high speed and to facilitate the control by providing a writing prohibiting attribute designating area and a reading prohibiting attribute designating area at the ID part of respective blocks of the magnetic disk device. CONSTITUTION:The ID part of respective blocks of a magnetic disk device is composed of a synchronizing pattern (PLO SYNC) to establish the synchronization, an address mark, a cylinder number (high order), a cylinder number (low order), a head number, a sector number, a flag, a writing prohibiting attribute designating area, a reading prohibiting attribute designating area, a cyclic redundancy checking (CRC) and a gap (GAP). A control means executes the control in accordance with the attribute information set to the ID part of a block having a writing prohibiting and reading prohibiting area and an additional information area. A recognizing means recognizes the attribute such as the writing prohibiting and reading prohibiting of the said block by the attribute information at the time of the writing and reading. Thus, the control can be executed at high speed and easily.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application) The present invention relates to write/read control of a magnetic disk device.

(Prior Art) Conventionally, in a magnetic disk device, writing/reading is performed by formatting the medium surface of the disk device and dividing it into blocks (sectors).

For control purposes, it may be necessary to assign attributes such as write prohibition/read prohibition to each block depending on the case.

By writing the attribute information for each block as data in a specific area inside the magnetic disk drive, reading the attribute information of that specific area into the memory of the control unit when the power is turned on, and searching the memory information during write/read operations. It was identified by attributes.

FIG. 2 is an explanatory diagram showing an example of an ID section using a block attribute classification method according to the prior art.

In Figure 2, is the ID section synchronized? Synchronization pattern to be established (PLO8YNC), address mark, cylinder number (
upper), cylinder number (lower), head number, sector number, flag, cyclic redundancy check (C
RC), and a gap (GAP).

(Problems to be Solved by the Invention) In the conventional block tonality identification method described above, it is sometimes necessary to search the memory in order to receive a write/read command, and the processing time becomes longer when the amount of attribute information increases. It has the disadvantage of becoming.

An object of the present invention is to have a write-prohibited/read-prohibited area and an additional information area in the ID section of each block in a magnetic disk device, and to check attributes such as write-prohibited/read-prohibited of the corresponding block based on attribute information when writing/reading. It is an object of the present invention to provide a block attribute identification method that eliminates the above-mentioned drawbacks by understanding the block attribute information, and is configured so that the processing time does not become long even if there is a large amount of attribute information.

(Means for Solving the Problems) The block attribute identification method according to the present invention includes a control means, g
, ='Jt means, and is applied to a magnetic disk device.

The control means is for executing control according to the attribute information set in the ID part of the block having the write inhibit/read prefecture area and the additional information area.

The recognition means is for recognizing attributes such as write prohibition/read prohibition of the corresponding block based on the attribute information at the time of writing/reading.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 shows I
FIG. 3 is a block diagram showing an embodiment of part D.

In Figure 1, the ID section includes a synchronization pattern (PLO5YNC) for establishing synchronization, an address mark, and a cylinder number (
upper), cylinder number (lower), head number, sector number, flag, write-protected attribute specification area, read-protected attribute specification area, cyclic redundancy check (CR)
C), and a gap (GAP).

In FIG. 1, 1 byte is used for the write-protection attribute designation area and 1 byte is used for the read-protection attribute designation area. Irregular 4 Computer System Inter 7Ax (Small
Computer System Interface
:5C8I), a command called a reserve unit command is defined, and it is possible to assign write-prohibited/read-prohibited attributes to each block inside the magnetic disk device.

If there is no write/read prohibition designation for the corresponding block, each is set as 10IQlHI, and if write/read prohibition is specified, it is a reserve unit command?
6-pit % corresponding to the issued host 5C8I ID
Set it to 1N.

When a read command is executed, the target block is detected using the address mark, cylinder number, head number, sector number, and flag, the read-prohibited attribute area is temporarily saved, and the data portion is read. While reading the data section, it is determined whether or not the data in the data section can be transferred based on the contents of the read-prohibited attribute area.

When executing a write command, the address mark, cylinder number, head number, sector number, and flag match, and the write-protected area is 100Hl.
A write operation is executed when the write-protected area is t.
If it is not QQ or #, the oath will not be taken.

In the above, control is executed by the control means according to the attribute information set in the ID section, and recognition of write prohibition/read prohibition is performed by the recognition means.

(Effects of the Invention) As explained above, the present invention provides a write-protection attribute designation area and a read-protection attribute designation area in the ID section of each block of a magnetic disk device.
This has the advantage that it is possible to quickly and easily control a magnetic disk device that requires read prohibition control.

[Brief explanation of the drawing]

FIG. 1 shows I
It is an explanatory view showing one example of part D. FIG. 2 is an explanatory diagram showing an example of an ID section using a block attribute identification method according to the prior art.

Claims (1)

[Claims] A control means for executing control according to attribute information set in an ID part of a block having a write-prohibited/read-prohibited area and an additional information area, and a control means for executing control according to attribute information set in an ID part of a block having a write-prohibited/read-prohibited area and an additional information area, and a write-prohibited part for the corresponding block according to the attribute information at the time of writing/reading. 1. A block attribute identification method for a magnetic disk device, characterized in that it comprises a recognition means for recognizing attributes such as read prohibition.