JPS61216169A - Fixed magnetic memory device - Google Patents

Abstract

PURPOSE:To improve the processing efficiency of a computer system and to attain a high-speed access of data by using hardware to perform the substitute processing for a defective part on the surface of a memory medium. CONSTITUTION:A memory 8 includes the memory parts 91, 92-9m for position information on defective areas consisting of an LSI memory storing the track and head numbers of the defective area of a magnetic disk 22 and memory parts 101, 102-10m consisting an LSI memory storing the track and head numbers of the area which substitutes said defective area, etc. If the position information on the defective area coincident with the track number position indicating signal 3 in the composite information 5 exists in the parts 91, 92-9m, a signal comparator 7 delivers the comparison result signal 12 to a signal selector 13 to validate the position information 11 on the substitute area corresponding to the position information 6 on the defective area. While the comparator 7 delivers the comparison result signal 12 which validates the information 5 to the selector 13 when said position information does not exist in the parts 91, 92-9m.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fixed magnetic storage device, and particularly to a fixed magnetic storage device used as an external storage device for a computer system.

[Conventional technology]

Fixed magnetic storage devices can provide high-speed and large-capacity data to computer systems, so they have rapidly become popular as prices have declined in recent years.

The operation of the fixed magnetic storage device will be explained using FIGS. 2 and 3. FIGS. 2 and 3 are a block diagram and a top view, respectively, showing an example of the configuration of a conventional fixed magnetic storage device. In the figure, a magnetic disk 22 has magnetic storage media 1 on its upper and lower surfaces, and a motor drives six magnetic disks 22 each having two read/write heads 20 and 21 for each magnetic disk 22. 23, and the read/write head 20 is rotated by the magnetic disk 22 in the radial direction as shown by the broken lines by the read/write head drive mechanism 17, which is installed in almost contact with the upper and lower surfaces of the magnetic disk 22, respectively. move in a straight line. Because the magnetic disk 22 is rotating.

The read/write head 20.21 follows the surface of the magnetic disk 22 with trajectories 221, 222 as shown in FIG. Each of these trajectories 22 depending on the position of the read/write head
1,222 etc. are called tracks. The read/write head drive mechanism 17 moves the read/write head 20, 21' to the track specified by the track position instruction signal 3 from the computer system. Therefore, the data 18 read/written by the read/write head 20
A read/write head selection circuit 16 switches which data 19 to be read/written by the read/write head 21 is to be connected to the computer system. The read/write head selection circuit 16 determines which read/write head to select based on the read/write head selection signal 1 sent from the computer system. The above is the basic operation of a fixed magnetic storage device.

Next, a description will be given of how the computer system controls the fixed magnetic storage device of this example.

The outermost track of the magnetic disk 22 is defined as track 10'', and the tracks rotating toward the center are track ``''1'S track''''.
2″′.

It is generally named Track@3-~. Regarding the read/write head, the read/write head 20 provided on the top surface of the magnetic disk 22 is the head O''.
Read/write head 21 provided on the bottom surface
It is named "1". In the above description of the basic operation of the fixed magnetic storage device, the case where there is one magnetic disk 22 was described, but currently, one fixed magnetic storage device often has a plurality of magnetic disks. Accordingly, the number of read/write heads increases accordingly. The read/write head provided on the top surface of the second magnetic disk is connected to the head 12.
”, the read/write head provided on the bottom surface is connected to head 3.
'', hereinafter the read/write head provided on the upper surface of the third magnetic disk is similarly named head 14'', etc.

The computer system allocates the address of the data storage location in the fixed magnetic storage device based on the track number and head number described above. Normally, one track is further subdivided into units called sectors, but their explanation will be omitted here. The computer system outputs the track position instruction signal 3 and read/write head selection signal 1 shown in FIG. operate.

Generally, magnetic disks in fixed magnetic storage devices include read/write data.
There are several defective parts that prevent write operations. These defective parts may occur during the manufacturing of the magnetic disk or during use of the fixed magnetic storage device. Users of solid magnetic storage devices must always avoid these defective parts. Specifically, the computer system recognizes the trut number and head number of the position where this defective part exists, and when it becomes necessary to read/write data in that part, it will be able to perform read/write operations. Data is read/written by converting the address to the track number and head number of another location. This is called alternative processing.

Conventionally, alternative processing such as recognizing the track number and head number of the defective portion and converting the address to a read/write operable portion was performed by computer system software.

[Problem that the invention seeks to solve]

Fixed magnetic storage devices, which are generally used as external storage devices for computer systems, are frequently accessed by the computer system.

In the above-mentioned conventional fixed magnetic storage device, replacement processing for defective portions on the storage medium surface is performed by software of the combi-tool system, which has the drawback of reducing the processing efficiency of the computer system and hindering high-speed data access.

[Means for solving problems]

The fixed magnetic storage device of the present invention incorporates processing means for performing alternative processing for defective portions on the surface of the storage medium. The processing means also includes a storage unit that stores defective part position information on the storage medium surface and alternative part position information corresponding thereto, and collates the defective part position information from the storage unit with position instruction information from the host device. and a selection processing section that selects the alternative portion position information when a matching result is obtained.

〔Example〕

Next, the present invention will be explained with reference to FIG.

FIG. 1 is a block diagram showing an embodiment of the fixed magnetic storage device of the present invention.

In FIG. 1, the read/write head selection signal 1 and track position instruction signal 3 sent from the computer system are temporarily stored in a register 4. The register 4 outputs composite information 5, which is a combination of the read/write head selection signal 1 and the track position instruction signal 3, to the signal comparator 7 and the signal selector 13. On the other hand, the memory 8 includes defective portion position information storage sections 91, 92, . ~9m and alternative part position information storage units 101, 102, which are composed of LSI memories and the like that store the track number and head number of the part to be used as a substitute for the defective part. It consists of ~10m. Since the defective part position information and the alternative part position information each form a pair, the memory 8 stores m pairs of defective part position information and alternative part position information corresponding to the defective part existing in the magnetic disk 22. It is stored as such.

Now, the signal comparator 7 sequentially compares and collates the composite information 5 from the register 4 with all the defective part position information 6 existing in the defective part position information storage sections 91, 92) to 9m of the memory 8. The signal comparator 7 outputs the comparison result signal 12 to the signal selector 13. The signal selector 13 selects the track position instruction signal 3 in the composite information 5 and the alternative partial position information storage units 101, 102 . The alternative partial position information 11 from ~tom is the comparison result signal 1 from the signal comparator 7
2, the read/write head selection circuit 16
A read/write head selection signal 14 and a track position instruction signal 15 are output to the read/write head drive mechanism 17, respectively. The signal comparator 7 determines whether the defective part position information that matches the track position instruction signal 3 in the composite information 5 is found in the defective part position information storage units 91, 92 . ~9m, a comparison result signal 1 that validates the alternative part position information 11 paired with the defective part position information 6
2 is output to the signal selector 13, and if the composite information 5 does not exist, a comparison result signal 12 is output to the signal selector 13 that makes the composite information 5 passed through the register 4 valid.

Note that in this embodiment, the alternative part position can be arbitrarily set by the computer system.

According to this example, the computer system does not need to perform alternative processing for defective parts in the fixed magnetic storage device, and the processing efficiency of the computer system can be improved. Furthermore, since the position conversion from a defective part to a replacement part is performed by software, the position conversion processing speed is faster than that performed by software in a conventional computer system.

〔Effect of the invention〕

As explained above, the present invention enables the computer system to perform alternative processing for defective parts on the storage medium surface using 7-ware, thereby eliminating the need for the computer system to perform alternative processing and achieving the processing efficiency required for an external storage device. This has the effect of satisfying various conditions such as good performance and high-speed data access. Furthermore, since the alternative part position can be set arbitrarily by the computer system, the most efficient magnetic disk control system can be configured by selecting the alternative part position according to the individual magnetic disk control system. be.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a fixed magnetic storage device of the present invention, and FIGS. 2 and 3 are a block diagram and a top view, respectively, showing an example of the configuration of a conventional fixed magnetic storage device. 1.14...Read/write head selection signal, 2
．． 18, 19... Data, 3, 15...
・Track position instruction signal, 4...Register, 5
...Composite information, 6...Failure part position information, 7...Signal comparator 8...Memo IJ
,91,92. ~9m... Defective part position information storage section, 101, 102. ~iom...Alternative partial position information storage unit, 11...Alternative partial position information,
12... Comparison verification result signal, 13...
Signal selector, 16... Read/write head selection circuit, 17... Read/write head drive mechanism, 20° 21... Read/write head, 2
2... Magnetic disk, 221, 222...
...Trajectory, 23...Motor.

Claims (2)

[Claims] (1) A fixed magnetic storage device characterized by having a built-in processing means for performing alternative processing for defective portions on the surface of the storage medium. (2) In the fixed magnetic storage device according to claim (1), the processing means includes a storage unit that stores defective part position information on the storage medium surface and alternative part position information corresponding thereto; A fixed magnetic storage device comprising: a selection processing unit that compares defective part position information from a host unit with position instruction information from a host device and selects the alternative part position information when a matching result is obtained.