JPS58147802A - Information recording method of floppy disk - Google Patents

Abstract

PURPOSE:To increase the amount of information which can be recorded without causing any off-track phenomenon by making track density greater at an outer circumference where expansion depending upon temperature and humidity is large than at an inner circumference where the influence of the expansion is less. CONSTITUTION:In an area (a) from an outermost circumferential track (0 track) to the 1st track, recording with the conventional standard track density of 48 TPI is performed. In an area (b) from the (i+1)th track on the inner circumferential side to an innermost circumferential track, the track density is doubled to 99 TPI. A switching track (i) depends upon the expansion/contraction length of a medium, but when this track (i) is nearly a half the overall length, the storage capacity of each side of floppy disk is increased by one and half.

Description

[Detailed description of the invention] [Description of the technical field to which the invention pertains] Concerning how to efficiently record.

[Description of prior art]

In devices with a large diameter, such as a conventional standard 8-inch floppy disk, attempts to improve its track density (the number of tracks per unit radial distance) may be affected by temperature or humidity expansion of the floppy disk. Otherwise, off-rack may occur during reading. To avoid this, track servo technology is known, but the equipment becomes expensive. For this reason, track density and
It was possible to increase the

[Purpose of the invention]

The present invention focuses on the fact that the expansion due to temperature or humidity fK is large near the outer periphery, and decreases as the inside becomes smaller due to temperature or humidity. purpose.

[Summary of the invention]

The present invention is characterized by a method of recording information by reducing the track density on the outer periphery of a disk and increasing the track density on the inner side.

[Explanation based on examples]

FIG. 1 shows an 8-inch floppy disk.

In the region (a) from the outermost trunk (0 track) to the first track, recording is performed at 48 TP, which is the conventional standard trunk density. Next, in the area (b) from the 1+19th track on the inner circumference side to the innermost track,
Track density will be doubled to 96TP.

The switching track 1 is determined by the expansion and contraction length of the medium due to temperature and humidity, but as shown in Figure 1, if this length is reduced to about half of the total length, the storage capacity per side of a conventional floppy disk is 15 times that of a conventional floppy disk. becomes.

In other words, the conventional storage capacity can be obtained only in area (b), and the capacity is increased by the area (a).

Changing the track density for one track in this way can be easily realized using the circuit illustrated in FIG. That is, in region (a), two pulses (25 top/'rrack) are used to move the step motor 1 for seeking the magnetic head by one track, and in region (1))
Then, one pulse of gold is used to move one track (15 to
p/Track), it can be accommodated by slightly changing the circuit of the conventional device.

The circuit shown in FIG. 2 will be explained in detail. The seek command from the host device is given from a step command S indicating the number of tracks to be followed and a signal indicating the direction to proceed. These instructions are added to counter 2.

The counter 2 is mask-reset by the 0-track sensor output (output of the 0-track detector) R, and the number of tracks is incremented by the step command SK. Whether the power is amplified or down depends on the signal. In this way, the counter 2 becomes a register indicating how many tracks the head is currently located on.

On the other hand, inputs 8 and D are applied to pulse generating circuits 3 and 4. This circuit 3Fi1stop/Track is a circuit that generates a pulse signal, and circuit 4 is 25tep/terres.
This is a circuit that generates an ACLC pulse signal. The output of these circuits 3.4 is added to 5.6. Here, the output of the force inputter 2 is ANDed and applied to the motor drive circuit 7.

In such a configuration, the output enable of the counter 2 is "1" and the output q is "0" from the innermost track to the first track, so the generation circuit 4 of 2at@p/TrgLCk is enabled, and the step When the motor l is incremented by one track with two pulses, it becomes K. On the other hand, from the 1+1 track to the innermost track, the output Q is "1" and the output possible is "0", so 1step /Track (D
The Q generation circuit 3 becomes effective, and the step motor 1 is incremented by one track with one pulse.

[Explanation of application examples]

In the above example, the entire floppy disk is divided into two areas, but if the entire floppy disk is divided into Kn areas,
Recording can be performed by increasing the recording density on the inside. A control circuit for this purpose can be similarly designed by learning from the above example.

[Explanation of Effects] As explained above, according to the present invention, the track density tube can be made smaller in the outer periphery where expansion due to temperature and humidity is large, and the track density can be increased in the inner periphery where the influence of expansion is small. For example, the amount of information that can be recorded without causing off-track can be increased.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a method according to an embodiment of the present invention. FIG. 2 is a diagram showing an example of the configuration of a control circuit for implementing the present invention. l...Step motor, 2...Counter, 3.4.
...Pulse generation circuit, 5.6...-AND circuit, 7...
・Drive circuit. Patent applicant NEC Corporation Representative Patent attorney Nao Takashi Ide

Claims (2)

[Claims] (1) Divide the floppy disk from the outermost track to the innermost track into multiple areas, and record information so that the track density in the inner area is greater than the track density in the outer area. A method for recording information on a floppy disk as a 1s image. (2) The floppy disk according to claim (1), wherein the plurality is 2, and the area is divided by approximately half the distance from the outermost track to the innermost track.
How information is recorded on a disc.