JPH01285070A - Floppy disk device - Google Patents

Abstract

PURPOSE:To improve the processing efficiency of a host device and to access data at high speed by performing the alternative processing of a defective part on the face of a storage medium with hardware. CONSTITUTION:The defective part position information of defective part position information storage parts 91, 92, -9m and the alternative part position information of alternative part information storage parts 101, 102, -10m which are the pair are read out of the defective part alternative part position information storage part of a floppy disk 16 through read-write heads 17 and 18 and stored in a defective position information register 8. Consequently, before the host device processes the read-write data, the floppy disk device reads a defective part alternative part position information signal 31 out of the defective part alternative position storage part of the floppy disk 16 and stores it in the defective position information register 8. Thus, the host device need not perform the alternative processing concerning the defective part of the floppy disk and the processing efficiency of the host device can be improved. Its position conversion processing speed becomes higher than performed with the software of the host device.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a floppy disk device.

[Conventional technology]

Floppy disk devices are used in a wide variety of applications because they are small, inexpensive, and easy to handle. In addition, in recent years, floppy disk devices have become more compact and consume less power, so they are increasingly being used in portable devices.

Next, the operation of the floppy disk device will be explained using FIGS. 3 and 4.

FIG. 3 is a block diagram showing an example of a conventional floppy disk device, and FIG. 4 is a top view thereof.

A floppy disk 16 having a magnetic storage medium on its surface is rotated by a motor 14, and the floppy disk 16 is rotated by a motor 14.
The read/write heads 17 and 18 are contacted to perform recording and reproducing operations.

The read/write heads 17 and 18 are moved linearly in the radial direction of the floppy disk 16 by the read/write head driver groove 13. Since the floppy disk 16 is rotating, the read/write head 17 is moved at 32. in FIG.
33, trace the surface of the floppy disk. Each of these trajectories 32 and 33 depending on the position of the read/write head is called a track. The read/write head drive mechanism 13 moves the read/write head 17. to the track designated by the track position instruction signal 2 from the host device.
Move 18.

Generally, the floppy disk 16 has magnetic storage media on its upper and lower surfaces, and each floppy disk has two read/write heads.

Therefore, the read/write head selection unit 25 switches which of the data recorded and reproduced by the read/write head 17 and the data recorded and reproduced by the read/write head 28 should be connected to the host device.

The read/write head selection unit 25 determines which read/write head to select based on the read/write head selection signal 1 sent from the host device.

The above is the basic operation of the floppy disk device.

Next, we will explain how this floppy disk device is controlled by the host device.

Set the outermost track of floppy disk 16 to track 1
and track 2. toward the center. Track 3. Track 4.・・・・・・It is named after - boat fishing.

Regarding the read/write head, the read/write head that is in contact with the top surface of the floppy disk 16 is set to head 0.
, the read/write head in contact with the lower surface is named head 1. The host device allocates the address of the data storage location in the floppy disk device using the track number and head number described above.

The host device outputs a track position instruction signal 2 and a read/write head selection signal 1 shown in FIG. 3 to the floppy disk device to designate a predetermined track in the floppy disk device and manipulate the data thereon.

Generally, floppy disks have several defective parts that prevent recording and playback operations. Floppy disk users must always avoid these defective parts. Specifically, the host device recognizes the track number and head number of the position where this defective part exists, and when recording and reproducing data in that part, it recognizes the track number and head number of another location where recording and reproducing operations are possible. Data is recorded and played back by exchanging addresses with head numbers. This is called alternative processing.

Currently, alternative processing such as recognizing the track number and head number of the defective portion and exchanging the address to a portion capable of recording and reproducing operations is performed by software in a host device.

[Problem to be solved by the invention]

In this way, in conventional floppy disk devices,
Since alternative processing is required to avoid defective parts and use them, there is a problem in that the processing efficiency of the host device is reduced and high-speed access to data is hindered.

An object of the present invention is to provide a floppy disk device that allows high-speed access and improves the processing efficiency of a host device.

[Differences between the invention and the prior art]

The present invention differs from the conventional floppy disk device described above in that alternative processing is realized by hardware and is built into the floppy disk device.

[Means to solve the problem]

The floppy disk device of the present invention includes a position signal register that inputs a read/write head selection signal and a track position instruction signal from a host device and outputs a selected position signal, a floppy defective part position information storage unit, and an alternative part position information. a defective position information register comprising a storage section; a position signal comparison section for comparing a selected position signal from the position signal register with the defective part position information from the defective part position information storage section; The alternative data read/write head to be recorded and reproduced and the comparison result signal from the position signal comparison section are input, and the data is recorded and reproduced by the normal read/write head or by the alternative data read/write head. The device includes a signal selection unit that selects whether to record or reproduce data.

〔Example〕

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

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

In FIG. 1, once the read/write head selection signal 1 and track position instruction signal 2 sent from the host device are
Store in position signal register 3.

The position signal register 3 outputs a selected position signal 4, which is a combination of the read/write head selection signal 1 and the track position instruction signal 2, to the position signal comparator 6.

On the other hand, the defective position information register 8 is stored in the floppy disk 1.
A defective part position information storage section 91,92.6 stores the track position and head position of the defective part of No.6. ~9m and alternative part position information storage units 101, 102, which store the track position and head position of the alternative part where data is recorded and reproduced by an alternative data read/write head, which is used as a substitute for the defective part. It consists of ~10m. The defective part position information and the alternative part position information exist as a pair. Therefore, the defective part position information register 8 has pairs of defective part position information and alternative part position information corresponding to the number of defective parts existing on the floppy disk 16.

The position signal comparison unit 6 compares the selected position information signal 4 from the position signal register 3 with the defective part position information storage units 91, 92 . It sequentially compares and collates all the defective part position information signals present in ~9m, and outputs the comparison and collation results to the signal selection section 29.

The signal selection unit 29 processes data at the position on the storage medium surface of the floppy disk 16 specified by the read/write head selection signal 1 and track position instruction signal 2 from the host device, or stores the data in the defective position information register 8. Floppy disk 16 specified by the alternative part location information
Select whether to process data at the location on the storage medium surface. When the selected position information signal 4 matches the defective part position information signal 5 from the defective part position information register 8, the signal selection unit 29 selects alternative part position information paired with the defective part position information signal. Specified floppy disk 1
Select the data at the position No. 6 on the storage medium surface. If the selected position information 4 does not match the defective part position information 5 from the defective position information register 8, the signal selection unit 29 is designated by the read/write head selection signal 1 and track position instruction signal 2 from the host device. Data at a position on the storage medium surface of the floppy disk 16 is selected.

In this embodiment, the defective part position information storage sections 91, 92 . ~9m defective part position information and its paired alternative part position information storage unit 101,1
02. The substitute part position information of ~10 m is read out from the defective part substitute part position information storage section of the floppy disk 16 through the read/write heads 17 and 18 and stored in the defective position information register 8. Therefore, before the host device performs read/write data processing, the floppy disk device reads the defective portion replacement portion position information signal 31 from the defective portion replacement portion position information storage section of the floppy disk 16 and stores it in the defective position information register 8. Store.

According to this embodiment, there is no need for the host device to perform any alternative processing for the defective portion of the floppy disk, and the processing efficiency of the host device can be improved.

Furthermore, since the position exchange from the defective part to the substitute part is performed by hardware, the position conversion processing speed is faster than when it is performed by software of the host device.

FIG. 2 is a block diagram of a second embodiment of the present invention.

In FIG. 2, once the read/write head selection signal 1 and track position instruction signal 2 sent from the host device are
Store in position signal register 3.

From the position signal register 3, a selection position signal 4 which is a combination of the read/write head selection signal and the track position instruction signal 2 is output.
is output to the position signal comparison section 6.

On the other hand, the defective position information register 8 is stored in the floppy disk 1.
A defective part position information storage section 91,92.6 stores the track position and head position of the defective part of No.6. ~9m and the track position of the alternative part where data is recorded and reproduced by the alternative data read/write head used as a substitute for the defective part.

Alternative partial position information storage unit 1 in which head positions are stored
01,102. It consists of ~10m. The defective part position information and the alternative part position information exist as a pair. Therefore, the defective part position information register 8 stores as many pieces of defective part position information, substitute part position information, and replacement parts as there are defective parts existing on the floppy disk 16. Partial position information exists in pairs.

The position signal comparison unit 6 compares the selected position information signal 4 from the position signal register 3 with the defective part position information storage units 91, 92 . It sequentially compares and collates all the defective part position information signals present in ~9m, and outputs the comparison and collation results to the signal selection section 29.

The signal selection unit 29 processes data at the position on the storage medium surface of the floppy disk 16 specified by the read/write head selection signal 1 and track position instruction signal 2 from the host device, or stores the data in the defective position information register 8. Floppy disk 16 specified by the alternative part location information
If the selection position information signal 4 for selecting whether to process data at a position on the storage medium surface matches the defective part position information signal 5 from the defective position information register 8, the signal selection unit 29 selects the position on the storage medium surface. Floppy disk 16 designated by alternative part position information paired with defective part position information signal
Select the data at the position on the storage medium surface. If the selected position information 4 does not match the defective part position information 5 from the defective position information register 8, the signal selection section 29 selects the position specified by the read/write head selection signal 1 and track position instruction signal 2 from the host device. Data at a position on the storage medium surface of the floppy disk 16 is selected.

In this embodiment, the defective part position information storage sections 91, 92 . ~9m defective part position information and its paired alternative part position information storage units 101, 10
2. The replacement part position information of ~10 m is set by the defective part replacement part position information signal 31 from the host device.

Therefore, before performing read/write data processing, the host device sets the defective part position information and substitute part position information in the defective position information register 8 using the defective part substitute part position information signal 31.

According to this embodiment, if the host device sets the defective part position information and substitute part position information in the defective position information register 8 before processing read/write data, there is no need to perform substitute processing thereafter, and the host device The processing efficiency of the device can be increased.

Furthermore, since the position conversion from the defective part to the substitute part is performed by hardware, the position conversion processing speed is faster than when the position conversion is performed by software of the host device.

〔Effect of the invention〕

As explained above, the present invention uses hardware to perform alternative processing for defective portions on the storage medium surface, thereby eliminating the need for the host device to perform alternative processing and achieving high processing efficiency, which is required for external storage devices. This has the effect of satisfying various conditions such as being able to access data at high speed.

Furthermore, since the position of the alternative part can be arbitrarily set by the host device, an efficient floppy disk drive control system can be configured by selecting the optimum position of the alternative part for each floppy disk drive control system. There is an effect that can be done.

[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, Fig. 3 is a block diagram showing an example of a conventional floppy disk device, and Fig. 4 is a block diagram of a floppy disk device. FIG. 3 is a top view of the device. 1...Read/write head selection signal, 2...
... Track position instruction signal, 3 ... Position signal register, 4 ... Selected position signal, 5 ...
・Defect part position information, 6...position signal comparison section,
7... Comparison and verification result signal, 8... Defective position information register, 91, 92. ~9m... Defective part position information storage section, 101, 102. ~10m...
...Alternative part position information storage unit, 11...Alternative part position information signal (read/write head selection), 12
. . . Alternative partial position information signal (track position selection), 13 . . . Read/write head drive mechanism, 1
4... Motor, 15... Alternative data read/write head drive mechanism, 16... Floppy disk, 17.18, 19.20... Read/write head , 21.22, 23.24...
Read/write data from read/write head, 25.
...Read/write head selection section, 26...
・Alternative data read/write head selection section, 27, 28・
...read/write data, 29...signal selection section, 30...read/write data, 31.
...Defective part replacement part position information signal, 32. 3
3・−・−) rack. Agent: Patent Attorney Uchihara Otoz, 7/Otsu

Claims (1)

[Claims] A defective floppy disk consisting of a position signal register that inputs a read/write head selection signal and a track position instruction signal from a host device and outputs a selected position signal, a floppy disk defective part position information storage unit, and an alternative part position information storage unit. a position information register; a position signal comparison unit that compares a selected position signal from the position signal register with the defective part position information from the defective part position information storage unit; and an alternative for recording and reproducing data in an alternative part of the floppy disk. The comparison result signal from the data read/write head and the position signal comparison section is input, and data is recorded and reproduced using the normal read/write head or data is recorded and reproduced using the alternative data read/write head. 1. A floppy disk device, comprising: a signal selection unit that selects whether to use a floppy disk.