JPH0312071A - Fixed magnetic storage device - Google Patents

Abstract

PURPOSE:To eliminate the need for an alternate processing of a host device and to promote the processing efficiency and then to access a bit of information at high speed by performing the alternate processing of a defective part on the surface of a storage medium with hardware. CONSTITUTION:Position information of a storage part of a defective position information register 8 and position information of an alternate part position information storage part forming a counterpart to the former are read out of a defective part of a magnetic disk 22 and the alternate part position information storage part via read/write heads 20 and 21 to be stored in the register 8. Consequently, before processing read/write information by a host device with the fixed magnetic storage device, the defective part of the magnetic disk and the defective part/alternate part position information 25 from the alternate part position information storage part are read out and stored in the register 8 by an IC for controlling the fixed magnetic storage device, so that it is not necessary for the host device to carry out any alternate processing, and hence the processing efficiency can be promoted. Then, since an address change from the defective part to the alternate part is performed by the hardware, this address change processing speed is faster than the conventional method with software.

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 using a magnetic storage controller.

[Conventional technology]

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

Next, a method of controlling the fixed magnetic storage device will be explained using FIGS. 3 and 4.

FIG. 3 is a block diagram of a magnetic storage section used in an example of a conventional fixed magnetic storage device, and FIG. 4 is a plan view of the magnetic disk of FIG. 3. A conventional fixed magnetic storage device consists of a magnetic storage section, a magnetic storage control section (not shown), and an alternative processing device (not shown) for a host device as shown in FIG. As shown, a magnetic disk 22 having a magnetic storage medium formed on its surface is rotated by a motor 24, and a read/write head 20, 21 is brought into almost contact with the magnetic disk 22 to perform recording and reproducing operations. The write heads 20° 21 are moved linearly in the diametrical directions A and B of the magnetic disk 22 by the read/write head Kudo mechanism 23. Since the magnetic disk 22 is rotating,
The read/write head 20.21 is 26.27 in FIG.
It moves on the surface of the magnetic disk 22 along a trajectory as shown in FIG.

These respective trajectories according to the positions of the read/write heads 20 and 21 are called tracks 26°27.

The read/write head drive mechanism 23 moves the read/write head 20, 21 to the track designated by the track position instruction signal 3 from the magnetic storage control section.

The magnetic disk 22 has magnetic storage media formed on its upper and lower surfaces, and has two read/write heads for one magnetic disk.
own. Therefore, the read/write data 18 recorded and reproduced by the read/write head 20 and the write head 2
The read/write head selection unit 17b switches which of the read/write data 19 recorded and reproduced in the read/write data 19 to be input or output to the magnetic storage control unit.

The read/write head selection unit 17b determines which read/write head to select based on the read/write head selection signal l sent from the magnetic storage control unit.

The above is the basic operation of the fixed magnetic storage section.

Next, control of the fixed magnetic storage section will be explained.

The tracks on the magnetic disk 22 include track 0 as the outermost track, and track 1 toward the center of the magnetic disk.
．． Track 2. Track 3... is numerically named. Regarding the read/write heads 20 and 21, the read/write head 2o in contact with the top surface of the magnetic disk 22 is named head 0, and the read/write head 21 in contact with the bottom surface is named head 1. In the above explanation of the basic operation of the fixed magnetic storage unit, the case where there is one magnetic disk 22 was described, but currently, with - fixed magnetic storage units,
In many cases, multiple magnetic disks and ri are herded. Accordingly, the number of read/write heads increases accordingly. The read/write head in contact with the top surface of the second magnetic disk is head 2, the read/write head in contact with the bottom surface is head 3.The read/write head in contact with the top surface of the third magnetic disk is head 4. It is named...

The magnetic storage control section allocates addresses of data storage locations in the fixed magnetic storage section based on the track number and head number described above. Furthermore, one track is subdivided into units called sectors. The magnetic storage control unit recognizes in which sector the read/write head is located from the content of the read/write data.

The magnetic storage control section receives a command from the alternative processing device of the host device, and outputs the track position instruction signal 3 and read/write head selection signal 1 shown in FIG. 3 to the fixed magnetic storage section, and A predetermined track in the magnetic storage unit is designated, and then, while recognizing the sector position, the data in that sector is manipulated.

Generally, a magnetic disk of a fixed magnetic storage unit has several defective parts where recording and reproducing operations cannot be performed. Defective parts may occur during the manufacturing of the magnetic disk or during use of the fixed magnetic storage section. Users of fixed magnetic storage units must always avoid these defective parts.

Specifically, the host device recognizes the track number, head number, and sector position where this defective part exists, and records the data in that part.

When reproducing data, the address is converted to a track number, head number, and sector position of another location where recording and reproducing operations are possible, and data is recorded and reproduced. This is called alternative processing. Currently, alternative processing such as recognition of the track number, bed number, and sector position of the defective portion, and address conversion to a portion capable of recording and reproducing operations is performed by software in the host device.

[Problem to be solved by the invention]

With the conventional fixed magnetic storage devices mentioned above, it is necessary to use the software of the host device to perform alternative processing to avoid defective parts, which reduces the processing efficiency of the host device and prevents high-speed data access. There are drawbacks.

An object of the present invention is to provide a fixed magnetic storage device that allows high-speed data access and improves processing efficiency.

[Means to solve the problem]

The fixed magnetic storage device of the present invention inputs a read/write head selection signal, a track position instruction signal, and a sector position instruction signal from a sector position detection section that detects the sector position of a magnetic disk, and outputs a selected position signal. a register, a defective position information register comprising a defective part position information storage unit and an alternative part position information storage unit of the magnetic disk, a selected position signal from the position signal register, and defective part position information from the defective position information register. a position signal comparison unit that outputs a comparison result signal by comparing the data with the data, and a data signal selection unit that inputs the comparison result signal and determines whether to send the read/write data to either the alternative data storage unit or the read/write head. It consists of:

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a first embodiment of the present invention.

As shown in FIG. 1, a read/write head selection signal 1, a track position indication signal 3, and a sector position indication signal 28 from a sector position detection section (not shown) for detecting the sector position of the magnetic disk 22 are input. A position signal register 4 that outputs a selected position signal 5; and a defective part position information storage section 9 that stores information about the defective part 1 of the magnetic disk 22 in advance.
- 100 million copies of alternative part position information 10 for storing 1 to 9-m and alternative part position information 11 in pairs with defective part position information -
1 to 10 to m, and a position signal comparison unit 7 that compares the selected position signal 5 from the position signal register 4 and the defective part position information 6 and outputs a comparison result signal 12. , a data signal selection unit 13 which receives the comparison result signal 12 and selects and outputs read/write data; and read/write data 14 from the data signal selection unit 13.
When the read/write data 15 from the data signal selector 13 is input, the read/write head 2 is selected by the read/write head selection signal 1.
a read/write head selection unit 17 that selects one of 0.21, a magnetic disk 22 and a read/write head 2;
0.21 and a magnetic disk section equipped with their drive mechanism.

In FIG. 1, a 0 position signal register 4 stores a read/write head selection signal 1, a track position instruction signal 3, and a sector position instruction signal 28 sent from a host device (not shown) in the position signal register 4. From there, a selected position signal 5, which is a combination of the read/write head selection signal 1, the track position indication signal 3, and the sector position indication signal 28, is output to the position signal comparison section 7.

On the other hand, the defective position information register 8 includes defective part position information storage sections 9-1 to 9m in which defective part position information 6 of the track position, head position, and sector position of the defective part of the magnetic disk 22 is stored, and the defective part. It is comprised of alternative part position information storage parts 10-1 to 10m in which alternative part position information 11 is stored in an alternative data storage part 16 constructed of an LSI memory or the like used as a substitute for . The defective part position information 6 and the alternative part position information 11 exist as a pair. Therefore, in the defective position information register 8, there are pairs of defective part position information and alternative part position information corresponding to the number of defective parts present in the magnetic disk 22.

The position signal comparator 7 compares the selected position signal 5 from the position signal register 4 and all the defective part position information 6 existing in the defective part position information storage parts 9-1 to 9-m of the defective position information register 8. The comparison and verification results are sequentially compared and verified, and a comparison and verification result signal 12 of the comparison and verification results is outputted to the data signal selection section 13.

The data signal selection unit 13 selects whether to send the read/write data 2 from the host device to the read/write head selection unit 17 and process it on the storage medium of the magnetic disk 22 or to process it in the alternative data storage unit 16. do.

If the selected position signal 5 matches the defective part position information 6 from the defective position information register 8, the data signal selection unit 1
3 selects the alternative data storage section 16. As a result, the read/write data 2 from the host device is processed in the storage portion of the alternative data storage unit 16 specified by the alternative portion position information 11 paired with the defective portion position information 6 of the defective position information register 8. be done. If the selected position signal 5 does not match the defective part position information 6 from the defective position information register 8, the read/write data 2 from the host device is processed on the storage medium surface of the magnetic disk 22.

In the first embodiment, the defective part position information in the defective part position information storage part of the defective part position information register 8 and the alternative part position information in the alternative part position information storage part paired therewith are transmitted through the read/write head 2021. magnetic disk 22
The defective part/alternative part position information storage unit (not shown) is read out from the defective part/alternative part position information storage unit (not shown) and stored in the defective part position information register 8. Therefore, before the host device performs read/write data processing on the fixed magnetic storage device, the fixed magnetic storage device control integrated circuit collects the defective portion/substitute portion position information 25 from the defective portion/alternative portion position information storage unit of the magnetic disk. It is read and stored in the defective position information register 8.

According to the first embodiment, there is no need for the host device to perform any alternative processing for defective portions in the magnetic disk, and the processing efficiency of the host device can be improved. Furthermore, since the address conversion from the defective part to the replacement part is performed by hardware, the address conversion processing speed is also faster than that performed by software of a conventional host device.

FIG. 2 is a block diagram of a second embodiment of the present invention.6 As shown in FIG.
In the first embodiment shown in the figure, the defective part/alternative part position information 25 of the magnetic disk 22 is inputted to the defective position information register 8 from the read/write head selection unit 17, whereas the defective part/substitute part is input from an external device. Position information 251 is input.

In FIG. 2, the read/write head selection signal 1, track position indication signal 3, and sector position indication signal 28 sent from the host device are stored in the position signal register 4. A selected position signal 5, which is a combination of the read/write head selection signal 1, the track position indication signal 3, and the sector position indication signal 28, is output to the position signal comparator 7.

On the other hand, the defective position information register 8 is used as a substitute for the defective part position information storage sections 9-1 to 9-m, which store the track position, head position, and sector position of the defective part of the magnetic disk 22. Alternative part position information 1 in the alternative data storage unit 16 configured with LSI memory etc.
1 is stored in the alternative partial position information storage unit 10-1~
It consists of 10-m.

Each of the defective part position information 6 and the alternative part position information 11 exists as a pair. Therefore, in the defective position information register 8, there are pairs of defective part position information and alternative part position information corresponding to the number of defective parts present in the magnetic disk 22.

The position signal comparator 7 sequentially compares the selected position signal 5 from the position signal register 4 and all the defective part position information 6 existing in the defective part position information storage parts 9-1 to 9-m of the defective position information register 8. The comparison and verification result is outputted to the data signal selection section 13 as a comparison and verification result signal 12.

The data signal selection unit 13 selects whether to send the read/write data 2 from the host device to the read/write head selection unit 17 to be processed on the storage medium of the magnetic disk 22 or to be processed by the alternative data storage unit 16. do.

If the selected position signal 5 matches the defective part position information 6 from the defective position information register 8, the data signal selection section 13 selects the alternative data storage section 16. As a result, the alternative data storage unit 1 specified by the alternative part position information paired with the defective part position information of the defective part position information register 8
The read/write data 2 from the host device is processed in the storage section 6. If the selected position signal 5 does not match the defective part position information signal 6 from the defective position information register 8, read/write data 2 from the host device is processed on the storage medium surface of the magnetic disk 22.

In the second embodiment, the defective part position information 6 of the defective part position information storage parts 9-1 to 9-m of the defective part position information register 8 and the substitute part position information storage part 10-1 paired therewith are
The substitute part position information 11 of ~10-m is the defective part/substitute part position information signal 25. from the host device. It can be set arbitrarily. Therefore, before processing read/write data in the fixed magnetic storage device, the host device
Alternative partial position information signal 25. Defective part location information 6
and the alternative partial position information 11 is set.

According to the second embodiment, if the host device sets the defective part position information and alternative part position information in the defective position information register 8 before processing read/write data in the fixed magnetic storage device, then the magnetic disk There is no need to perform alternative processing for defective parts within the system, and the processing efficiency of the host device can be increased. In addition, since the address conversion from the defective part to the replacement part is performed by hardware, the address conversion processing speed is also faster than that performed by the software of the conventional host device.6 [Effects of the Invention] As explained above, the present invention By performing alternative processing for defective portions on the storage medium surface using hardware, the higher-level device does not need to perform alternative processing, thereby improving the processing efficiency of the higher-level device and enabling high-speed data access.

In addition, since the alternative part position can be arbitrarily set by the host device, an efficient fixed magnetic storage device control system can be constructed by selecting the alternative part position according to the individual fixed magnetic storage device. There is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a first embodiment of the present invention, FIG. 2 is a block diagram of a second embodiment of the present invention, and FIG. 3 is a block diagram of a magnetic storage unit using an example of a conventional fixed magnetic storage device. The block diagram, FIG. 4, is a plan view of the magnetic disk of FIG. 3. 1... Read/write head selection signal, 2... Read/write data, 3... Track position instruction signal, 4...
・Position signal register, 5... Selected position signal, 6...
Defective part position information, 7... position signal comparison section, 8...
Defective position information register, 9-1 to 9-m... Defective part position information storage unit, 10-1 to 10-m... Alternative part position information storage unit, 11... Alternative part position information, 12.・
・Comparison and verification result signal, 13...data signal selection section, 1
4.15... Read/write data, 16... Alternative data storage section, 17.17. ... Read/write head selection section, 18.19... Read/write data, 20.2
DESCRIPTION OF SYMBOLS 1... Read/write head, 22... Magnetic disk, 23... Read/write head drive mechanism, 24...
Motor, 25, 25. ...Bad part/alternative part position information, 26.27...Track, 28...Sector position indication signal.

Claims (1)

[Claims] a position signal register that receives a read/write head selection signal, a track position instruction signal, and a sector position instruction signal from a sector position detection section that detects a sector position of the magnetic disk and outputs a selected position signal; and a defective portion of the magnetic disk. A defective position information register consisting of a position information storage section and an alternative part position information storage section compares the selected position signal from the position signal register with the defective part position information from the defective position information register to generate a comparison result signal. and a data signal selection section which inputs the comparison result signal and determines whether to send the read/write data to either the alternative data storage section or the read/write head. Fixed magnetic storage.