JPH011164A - floppy disk drive device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of Industrial Application The present invention relates to a floppy disk drive device that speeds up the operation of initializing a floppy disk.

(2) Conventional technology Traditionally, floppy disks used in personal computers, word processors, etc. have been written on the floppy disk before use, with tracks being written in the radial direction and in the circumferential direction as shown in Figure 4. The physical locations for writing and reading data must be determined by dividing it into sectors. This is the first time that we have been able to determine the physical location by dividing it into tracks and sectors! ! ! It is called 1ization.

Roughly speaking, today, both sides of a floppy disk are used for writing and reading data, and initialization is performed on both sides of the floppy disk, distinguishing side 0 and size F' 1 on the front and back sides, respectively. .

This initialization process utilizes the index signal and side switching signal generated within the floppy disk drive to transfer predetermined data to the floppy disk while switching tracks and sides as shown in the flowchart in Figure 3. This is done by writing. Here, the index signal is 1 equal to the rotation of the floppy disk.
The side switching signal is a pulse signal that is output once per rotation, and is a switching signal for distinguishing the front and back sides of the floppy disk as side O and side I.

In a floppy disk drive, initialization and data reading and writing are performed by rotating the floppy disk and moving a read/write head (not shown) in the radial direction of the floppy disk.

Furthermore, in order to read and write on the front and back sides of a floppy disk, heads provided on the front and back sides of the floppy disk are switched. Therefore, time is required for the head to move from one track to the next until the operation becomes stable.Similarly, when the head is switched between side 0 and side l, the operation is stable. Before it stabilizes, the head IJJ
Time is required for replacement.

Therefore, conventionally, initialization was performed as follows.

That is, first, when the index signal shown in FIG. 5(a) falls, initialization data is written to track However, the side is switched from side 0 to side I until the next index signal falls.

After that, at the next falling edge of the index signal, track
, writes initialization data to side 1, finishes writing the initialization data at the falling edge of the index signal, and then writes data from side l to side O until the next index signal falls. Side switching and truck movement are performed.

Furthermore, at the next fall of the index signal, initialization data is written to track X+1, side 0.
First at the next falling edge of the index signal! Side switching from side 0 to side I is performed between the end of writing the 1n data and the next fall of the index signal.

Initialization is completed by repeating this until the final track. Note that switching from side O to side L or switching from side 1 to side O is performed by the side switching signal shown in FIG. 5(C), and when this side switching signal is at a high level, the floppy disk Side O is selected by a control circuit within the drive device, and side I is selected when the side switching signal is at a low level.

(3) Problems to be Solved by the Invention However, both head movement and side switching are performed within one cycle of the index signal, and head movement and side switching take an unnecessary long time. There is a problem in that the initialization process takes a long time because of idle time.

(4) Means for Solving the Problems The present invention has been made in view of the above points, and aims to speed up the initialization of floppy disks. In a floppy disk drive device that initializes a floppy disk based on an index branch signal synchronized with one rotation of the floppy disk and a side switching signal for distinguishing between the front and back sides of the floppy disk, the index signal is delayed. It is comprised of a delay means and a switching means for switching between the output of the delay means and the index signal based on the side switching signal.

(5) Effect In this configuration, the floppy disk is initialized based on the output of the switching means and the side switching signal, and by reducing the idle time that occurs when moving the side switching end track, the floppy disk can be initialized at high speed. It acts to change the situation.

(6) Examples Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a block diagram showing an embodiment of a floppy disk drive device according to the present invention.

In FIG. 1, an index signal A (second
Figure (a)) is provided. The index signal A is supplied to the selection circuit 6 as is, and is also supplied to the selection circuit 6 as a delayed signal B (FIG. 2(b)) delayed by a delay time T in the delay circuit 5. The delay time T is set in consideration of the time required for side switching of the head and movement between tracks. The selection circuit 6 is a switching circuit that switches between the index signals A and - or the delayed signal B and outputs the selected signal to the output terminal 3.

Input terminal 2 receives a side switching signal E (see Fig. 2(e)) which is externally supplied to the floppy disk drive device.
) is supplied as is, and this side switching signal E
The selection circuit 6 is switched by. That is, when the side switching signal E is at a high level, the index signal A supplied to the input terminal l is selected, and when the side switching signal E is at a low level, the delayed signal B, which is the output of the delay circuit 5, is selected. They are selected and supplied from output terminals 3 to a floppy disk controller (not shown) outside the floppy disk drive device.

Next, the operation will be explained with reference to FIG. Figure 2 shows
It is a waveform diagram explaining the operation|movement at the time of initial jjJJ conversion.

First, initialization data is written to the size l''O of track X when l falls to the first index signal. Writing of initialization data continues until the next fall of index signal A2.

When the index signal A2 falls, initialization of side l of track X cannot be started immediately because of the time required for side switching. Side l of truck
Initialization starts from the falling edge of the delay signal B2.

That is, the fall of 2 to the index signal and the delay signal B2
During the fall of , the side switching signal is switched from a high level to a low level, and the delay signal B, which is the output of the delay circuit 5, is selected by the selection circuit 6. As a result, the delay signal B is supplied to the floppy disk controller, and the fall of the delay signal B2 causes the track
Initialization data is written to side 1 of . Writing of initialization data continues until the next fall of delay signal B3. When the delay signal B3 falls, initialization of side 0 of track X+1 cannot be started immediately because of the time required for track switching and the time required for side switching. Initialization of side O of track X+1 is started from the fall of index signal A4.

Thereafter, the above-described initialization operation is repeated until the final track, thereby completing the initialization. In comparison with the conventional example shown in FIG. 5, the conventional example requires four cycles of the index signal to initialize both sides of the l track, whereas the floppy disk according to the present invention explained in FIG. According to the drive device, only three cycles of the index signal are required to initialize both sides of the same track.

Therefore, the initialization work can be performed in three-quarters of the time required compared to the conventional example, and the initialization time can be significantly shortened.

(7) Effects of the Invention As explained above, the present invention provides a method for switching the floppy disk based on the index signal synchronized with one revolution of the floppy disk and the side switching signal for distinguishing between the front and back sides of the floppy disk. A floppy disk drive device configured to perform initialization includes a delay means for delaying an index signal, and a switching means for switching between the output of the delay means and the index signal based on a side switching signal.

In this configuration, the output of the switching means and the side switching signal are used as a reference for the first floppy disk! ! By performing the n conversion and reducing the idle time that occurs during side switching and track movement, it is possible to speed up the initialization of the floppy disk.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a floppy disk drive device according to the present invention, FIG. 2 is a waveform diagram explaining the operation of the circuit shown in FIG. 1, and FIG. 23 is an explanation of the initialization operation. Figure 1 is a conceptual diagram explaining the initialization operation, Figure 5 is a flowchart for
FIG. 3 is a waveform diagram illustrating the initial jllization operation in a conventional floppy disk drive device. 1... Input terminal 2... Input terminal 3... Output terminal 5... Delay circuit 6... Selection circuit Patent applicant NEC Home Electronics Co., Ltd. Agent Patent attorney Yama 1) Takeki No. 3 Figure 4th flash

Claims (1)

[Claims] In a floppy disk drive device that initializes a floppy disk based on an index signal synchronized with one rotation of the floppy disk and a side switching signal for distinguishing between the front and back sides of the floppy disk, the index signal is It has a delay means for delaying, and a switching means for switching between the output of the delay means and the index signal based on the side switching signal. A floppy disk drive device that performs initialization.