JPH04192164A - floppy disk 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] Industrial applications The present invention relates to a floppy disk device.

2. Description of the Related Art In general, an information recording floppy disk used in a floppy disk device has a large number of concentrically formed information writing tracks.

By the way, since the data transfer speed in conventional floppy disk devices is the same, as shown in Figure 3,
The number of sectors 23 as the minimum writing unit provided on each track 22 of the floppy disk 21 is as follows:
They were all the same regardless of the length.

Problem to be Solved by the Invention In this way, although the length of the tracks formed on a floppy disk increases from the inside to the outside, the inner track with the shortest length is Only the number of sectors corresponding to the track length is formed, resulting in a great deal of waste.

Therefore, an object of the present invention is to provide a floppy disk device that can solve the above problems.

Means for Solving the Problems In order to solve the above problems, the floppy disk device of the present invention provides track 0 of the floppy disk drive.
A track number counting circuit that calculates a track number based on a number detection signal and a seek operation signal from a floppy disk controller, and data that changes the system clock and data write clock according to the track number signal from this track number counting circuit. The transfer speed switching circuit is equipped with a transfer speed switching circuit.

Effect: According to the above structure, the data transfer speed can be changed according to the track number of the floppy disk, so that the number of sectors per track can be increased from the inside to the outside.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows a block diagram of the main parts of a floppy disk device, and FIG. 2 is a plan view showing a state of recording on a floppy disk by the floppy disk device.

The floppy disk device according to this embodiment includes main equipment such as a floppy disk drive (not shown) and a floppy disk controller (not shown), as well as track 0 from the floppy disk drive, as shown in FIG. A reset circuit 1 inputs the number (number zero) detection signal a and outputs a reset signal S, a step pulse signal (for head movement) C from the floppy disk controller, and a direction control signal indicating the theta direction (hereinafter referred to as
DIR signal) d and a reset signal S from the reset circuit 1, and a track number count circuit 2 which outputs a track number signal e; The floppy disk controller is provided with a data transfer rate switching circuit 3 which inputs a reset signal S and outputs a system clock f and a write clock g corresponding to the track number to the floppy disk controller.

The operation in the above configuration will be explained.

When the floppy disk controller sets the initial state of the floppy disk drive, that is, track number 0, the track number O detection signal a from the floppy disk controller becomes active. In response to this track number 0 detection signal a, a reset signal is outputted from the reset circuit 1 to the track number counting circuit 2 and the data transfer switching circuit 3, and each reset is performed.

Next, when the floppy disk controller performs a seek operation to the target track, the track number counting circuit 2 calculates the track number using the step pulse signal C and the DIR signal d, and the track number signal e is output to the data transfer rate switching circuit 3. The data transfer speed switching circuit 3 outputs a system clock f and a write clock g corresponding to the track number to the floppy disk controller.
The data transfer speed is switched.

This data transfer speed is inside (track number is N)
The transfer speed is the same as before, and the outside (track number is 0)
As the number of tracks increases, the data transfer speed gradually increases so that it becomes the same value as the magnetic flux density of the inner track.

FIG. 2 shows track 1 recorded on the floppy disk 11 when the data transfer speed of the floppy disk controller is changed according to the track number.
2 and sector 13 are shown.

According to the above embodiment, the track number counting circuit 2 calculates the track number using the step pulse signal C and the DIR signal d, and the data transfer rate switching circuit 3 calculates the track number using the step pulse signal C and the DIR signal d.
Since the data transfer speed is switched according to the track number, the number of write sectors per track increases from the inside to the outside, and therefore the recording capacity of the floppy disk as a whole can be increased.

Effects of the Invention As described above, according to the configuration of the present invention, the data transfer speed can be changed according to the track number of the floppy disk, so that the number of write sectors per track can be increased from the inside to the outside. This makes it possible to significantly increase the recording capacity of the floppy disk as a whole.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
Fig. 1 is a block diagram showing the main parts of a floppy disk device, Fig. 2 is a plan view showing the state of recording on a floppy disk by the same floppy disk device, and Fig. 3 is a state of recording on a floppy disk by a conventional floppy disk device. FIG. 1... Reset circuit, 2... Track number counting circuit, 3... Data transfer switching circuit, a...
Track 0 detection signal, b...reset signal, C...
...Step pulse signal, d...DIR signal, e
...Track number signal, f...System clock, g...Write clock.

Claims (1)

[Claims] 1. A track number counting circuit that calculates the track number based on the track number 0 detection signal from the floppy disk drive and the seek operation signal from the floppy disk controller, and a system clock that calculates the track number based on the track number signal from the track number counting circuit. and a data transfer rate switching circuit that changes a data write clock.