JPH03198201A - Floppy disk device - Google Patents

Abstract

PURPOSE:To allow high-speed access and to improve the processing efficiency of host devices by providing plural detectors which detect index positions and outputting plural times of index signals during one rotation of disk. CONSTITUTION:The 1st and 2nd index position detectors 11, 12 which detect the index positions of the floppy disk 13 and an OR circuit 15 which ORs the outputs thereof are provided. Two pieces of the index holes formed on the disk 12 are detected by two pieces of the detectors 11, 12 and these are logically synthesized by the OR circuit 15 to output the one index signal 4. The index signals are, therefore, outputted twice in one rotation of the disk. The overhead time of the max. 160ms is thereby reduced to a half with the conventional disk fo 360 revolutions. The processing efficiency of the host device is thus improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a floppy disk device, and more particularly to a floppy disk device that detects the index position of a floppy disk.

[Conventional technology]

Conventionally, such floppy disk devices have been used in a wide range of applications because they are small, inexpensive, and easy to handle. Recently, as floppy disk devices have become smaller and have lower power consumption, they are increasingly being used in portable devices.

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

As shown in Figures 3 and 4, the conventional floppy
In the disk device, a floppy disk 13 having a magnetic storage medium on its surface is rotated by a motor 14, and a read/write head 8.9 is brought into contact with the floppy disk 13 to perform a recording or reproducing operation. The read/write head 8.9 moves linearly in the diametrical direction of the floppy disk 13 under the control of the read/write head drive mechanism 10. For example, since the floppy disk 13 is rotating, the read/write heads 8 and 9 follow the surface of the floppy disk 13 along the trajectory of the track 17 shown in FIG. On the other hand, the read/write head drive mechanism 10 uses a floppy drive (not shown).
The read/write head 8.9 is moved to the track designated by the track position instruction signal 3 from the disk device control integrated circuit.

The long floppy disk 13 has magnetic storage media on the top and bottom surfaces, and there are 2 disks for every 21 floppy disks.
Since it has read/write heads 8.9, the data recorded or reproduced by the read/write heads 8,
The read/write head selection unit 5 selects which of the data recorded or reproduced by the read/write head 9 is output to the floppy disk device control integrated circuit. That is, the read/write head selection unit 5 is controlled by the read/write head selection signal 1 sent from the floppy disk device control integrated circuit, and selects which read/write head 8 or 9 from the read/write data 2. Decide whether

Furthermore, the above-mentioned floppy disk device uses an index signal 4 for the floppy disk device control integrated circuit to take timing of data read/write processing.
This index signal 4 is output from the floppy disk.
When the index hole made in the disk 13 is detected by the index position detector 11, it is output.

In short, this index signal 4 is output once during one revolution of the floppy disk 13.

Next, the operation of the above-mentioned floppy disk device will be explained.

First, the outermost track of the floppy disk 13 is designated as track O, and tracks 1. Track 2. Track 3. ...I'm called to go fishing on a boat. Further, the read/write head 8 in contact with the upper surface of the floppy disk 13 and the read/write head 9 in contact with the lower surface of the head O1 are named head 1. Moreover, the floppy disk device control integrated circuit allocates addresses for data storage locations within the floppy disk device using the track numbers and head numbers described above.

Furthermore, one track is subdivided into units called sectors, and the floppy disk device control integrated circuit determines which sector the read/write head 8.9 is assigned to based on the contents of the index signal 4 and read/write data 2. Check if there is one.

The integrated circuit for controlling the floppy disk device outputs a track position instruction signal 3 and a read/write head selection signal 1 to the floppy disk device in response to commands from the host device, and outputs a track position instruction signal 3 and a read/write head selection signal 1 to the floppy disk device. Specify a given track of . After that, while checking the sector position, the data in that sector is manipulated. especially,
As described above, the floppy disk device control integrated circuit determines the timing of data read/write processing based on the index signal 4 output from the floppy disk device. -The rotation speed of the floppy disk 13 of the floppy disk device for boat fishing is 360 rpm.
m, the index signal 4 is output at a period of 160 m5. Therefore, when performing some processing on a floppy disk device, a maximum of 160 m5 of overhead time is required.

[Problem to be solved by the invention]

The above-described conventional floppy disk device requires an overhead time of up to 160 m5 when in use, which has the drawback of reducing the processing efficiency of the host device and hindering high-speed data access.

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

[Means to solve the problem]

The floppy disk device of the present invention includes a plurality of index position detectors for detecting index signals of the floppy disk, and means for outputting the index signal a plurality of times during one rotation of the floppy disk. It is composed of

〔Example〕

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

FIG. 1 is a block diagram of a floppy disk device showing a first embodiment of the present invention.

As shown in FIG. 1, this embodiment includes a read/write head selection section 5 that selects read/write heads 8 and 9 based on a read/write head selection signal 1, and a read/write head selection section 5 that selects read/write heads 8 and 9 based on a read/write head selection signal 1. 8.9, first and second index position detectors 11.12 that detect the index position of the floppy disk 13, and a motor 14 that rotates the floppy disk 13. , and an OR circuit 15 for taking the OR logic of the outputs of the index position detectors 11 and 12 and outputting it as the index signal 4.

In such a floppy disk device, two index holes made in the floppy disk 13 are detected by two index position detectors 11 and 12, and they are logically combined to produce one index signal 4.
Output. That is, one rotation of the floppy disk 13 outputs the index signal 4 twice. Therefore, in the case of a typical floppy disk device (rotation speed of 3
60 rpm), the maximum overhead time is reduced by half. Furthermore, by increasing the number of index holes and index position detectors, overhead time can be further reduced and processing efficiency of the host device can be increased.

FIG. 2 is a block diagram of a floppy disk device showing a second embodiment of the present invention.

As shown in FIG.
index holes are detected by two index position detectors 11 and 12, and their outputs are sent to an OR circuit 1.
5 are logically combined and one index signal 4 is output. In this embodiment, the index signal 4 is output twice when the floppy disk rotates once. Therefore, in the case of a typical floppy disk device (rotation speed: 360 rpm), the maximum overhead time is reduced by half.

Further, by further increasing the number of index holes and index position detectors 11, 12, overhead time can be further reduced, and processing efficiency of the host device can be improved.

〔Effect of the invention〕

As explained above, the floppy disk device of the present invention outputs the index signal multiple times during one revolution of the floppy disk, thereby reducing the overhead time of the host device and allowing high-speed data access. This has the effect of improving the processing efficiency of the host device.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a floppy disk device showing a first embodiment of the invention, FIG. 2 is a block diagram of a floppy disk device showing a second embodiment of the invention, and FIG. 3 is a block diagram of a floppy disk device showing a second embodiment of the invention. FIG. 4 is a block diagram of an example of a floppy disk device, and FIG. 4 is a top view of the floppy disk shown in FIG. 1... Read/write head selection signal, 2... Read/write data, 3... Track position instruction signal, 4
... Index signal, 5... Read/write head selection section, 6, 7... Read/write data, 8.9.
... Read/write head, 10... Read/write head drive mechanism, 11.12... Index position detector, 13... Floppy disk, 14... Motor, 15... OR circuit, 16... Axis.

Claims (1)

[Claims] A floppy disk characterized in that it has a plurality of index position detectors for detecting the index position of the floppy disk, and means for outputting an index signal a plurality of times during one revolution of the floppy disk. disk device.