JPS61162865A - Method and device for discriminating floppy disk - Google Patents

Abstract

PURPOSE:To discriminate the kinds of respective recording media only with floppy disks by discriminating the kinds of the respective recording media on the basis of differences in light transmissivity of the recording media which differ in recording density. CONSTITUTION:When a transistor Tr is on, the value of the load resistance of a photodetector 2 is set only by the quantity of light passed through an index hole 4 regardless of whether a standard recording medium or high-density recording medium is loaded so that the minus input terminal voltage of a comparator COMP is lower than its plus input terminal voltage. The output of the comparator COMP is outputted from a D type flip-flop IC4 with the leading edge of a monostable multivibrator IC3 and then the output signal of the D type flip-flop IC4 goes up to H when a standard recording medium is loaded and falls to L when a high-density medium is loaded, so that recording media which differ in transmissivity, i.e. recording density are discriminated. Consequently, the discrimination is made only at the side of the floppy disk device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a floppy disk discrimination method and a discrimination device, and in particular, to a floppy disk that is suitable for discriminating recording media with different recording densities. The present invention relates to a disc discrimination method and a disc discrimination device.

[Background of the invention]

In a conventional floppy disk device, in order to determine the type of recording medium, a process as shown in FIG. 5, which is a flowchart for determining the type of recording medium, is performed.

In other words, the floppy disk drive detects that the recording medium (media) has been exchanged, and the host system uses the detection signal related to this exchange to configure the circuit for high-density media, and then performs a specific test on the floppy disk drive. A read test is performed by instructing a seek to a track, a test signal corresponding to the recording density of the recording medium is recorded and reproduced, and the type of recording medium is determined based on the presence or absence of an error.

In other words, as shown in the figure, if the lead test is OK, leave the high-density media as is, and if the lead test is NG, that is, if it cannot be read, set the circuit for standard media, perform the lead test in the same way as above, and then perform the lead test. O
K is the standard media.

In the case of this method, in order to support recording media with different recording densities, it is necessary to use a floppy disk device.

This required changes to both the software on the host system side that controls this, and could not be easily adopted.

In addition, related to this type of device.

For example, there is a method described in JP-A-59-96562.

[Object of the Invention] The present invention provides a floppy disk discrimination method and a method for discriminating floppy disks in a simple manner that allows the discrimination between types of recording media with different recording densities to be completed within a floppy disk drive device without recording or reproducing signals. The purpose is to provide a discrimination device.

[Summary of the invention]

The floppy disk discrimination method according to the present invention is applied to a floppy disk device that is capable of selectively recording and/or reproducing information on recording media having different recording densities, or both.

The type of recording medium is determined based on the difference in light transmittance of recording media with different recording densities.

In addition, the configuration of the floppy disk discriminating device according to the present invention includes an index provided in a floppy disk device that can selectively perform recording or reproduction, or both, on recording media having different recording densities. Output from the signal detection mechanism. An output signal based on the amount of light transmitted through the recording medium is inputted, and a discrimination circuit is used to discriminate between recording media with different recording densities based on the input signal.

More detailed information is as follows.

High density of recording media is achieved mainly by increasing the coercive force of the magnetic material and making the magnetic layer thinner. The characteristics of general standard recording media and high-density recording media are shown in the table below.

That is, high-density media has a high light transmittance due to its thin magnetic layer thickness.

The present invention detects the above-mentioned difference in light transmittance to detect i? This is designed to determine the type of recording medium.

[Embodiments of the invention]

Embodiments of the present invention will be described with reference to FIGS. 1 to 4.

Here, FIG. 1 is used for carrying out an embodiment of the floppy disk discrimination method according to the present invention.

A block configuration diagram of a floppy disk device equipped with a floppy disk discrimination device, FIG. 2 is an enlarged perspective view of its index signal detection mechanism, and FIG. 3 is a circuit configuration diagram of a floppy disk discrimination device according to an embodiment. FIG. 4 is a timing chart thereof.

First, in FIG. 1, the R/W head is a head that selectively records or reproduces information on recording media with different recording densities, or performs the in-between process, and the R/W circuit controls this. It is something.

Further, the control circuit controls the R/W circuit using an interface signal from the interface circuit.

The media discrimination signal is sent to the host system as an interface signal, the index signal is sent to the host system as an interface signal, the R/W is controlled by the media discrimination signal, and circuit constants are set to be optimal for each medium. It is something.

The recording medium discriminating device related to the floppy disk discriminating device is constructed as shown in FIG. 3 by an index signal detection mechanism and a recording medium discriminating circuit, which will be described in detail below.

The index signal detection mechanism is shown in Figures 2 and 3 using water resistance R1.
, R5, and R6.

That is, in FIG. 2, the index hole 4 provided in the recording medium 3 is detected by the light emitting element 1 and the light receiving element 2, and as the recording medium 3 rotates, the index hole 4 is detected.
A detection signal is obtained every rotation.

Then, as shown in FIG. 2, the light emitted from the light emitting element 1 passes through the index hole 4 of the recording medium 3 and reaches the light receiving element 2.

As a result, a photocurrent flows through the light receiving element 2, the voltage at one input terminal of the comparator COMP decreases, and the resistors R5 and R
6, the output terminal of the comparator COMP changes from L to H when the voltage becomes lower than the voltage at the input terminal of the comparator COMP, which is determined by 6.

This output is the index signal input to the control circuit described above.

Therefore, the identification of a floppy disk is performed in a first-order manner.

That is, in FIG. 3, a monostable multivibrator (one-shot multivibrator) ICI.

The output pulse width of IC2 and IC3 is determined by resistors R7 and
The time tz-t determined by R8, R9 and capacitors C1, C2°C3 and shown in (2) to (4) in FIG.
It becomes m-tm.

Here, t shown in (1) index signal width in FIG.
is the time during which the light receiving element 2 can detect the light emitted from one light emitting element 1 through the index hole 4 of the recording medium 3.

Therefore, based on the above time t, these times are t
The settings are such that L>ts+t*+tj>tz+ts>tm.

Further, the output of the monostable multivibrator IC2 is connected to the base of a transistor T via a resistor R4, and the transistor is turned off only during a time t corresponding to the output pulse width.

Therefore, at one hour t3, the collector load resistance of the light receiving element 2 is only the resistor R1, and at times other than time t,
Since the transistor T is turned on, the collector load resistance of the light receiving element 2 becomes the value of the parallel connection of the resistor R1 and the resistor R2.

This state is shown in (5)R(+□□) in Fig. φ.

Here, the setting value of the resistance R1 is not only determined depending on the amount of light passing through the index hole 4, but also when the recording medium 3 is of high density. Even when the photocurrent of the light receiving element 2 is caused by the amount of light transmitted through the recording medium 3, the comparator COMP.

When the -input terminal voltage is set to be lower than the input terminal voltage, and in the case of a standard recording medium related to S quasi-density, the light receiving element 2 is affected by the amount of transmitted light other than the index hole 4. For photocurrent, comparator C
The voltage at one input terminal of OMF is set so as not to drop below the voltage at ten input terminals. That is, the output of the comparator COMP is L.

In addition, the value of the load resistance (parallel connection value of R2 and R1) of the light receiving element 2 when the transistor T is in the on state is the value of the load resistance (parallel connection value of R2 and R1) of the index hole 4, regardless of whether it is a standard recording medium or a high density recording medium. Depending on the amount of light that has passed through, one input terminal voltage of the comparator COMP increases to ten input terminal voltages (
It is set to be lower than the reference voltage v6°N, shown in the figure.

This state can be expressed as (6) COMP, -I N in Figure 4.
(Standard Media), (6')COMP, -I
N (high density media).

Therefore, the output signal of comparator COMP is.

Figure 4 (7) (7) COMP, OUT (standard media).

(7') CO? [P, OUT C high density media)
As shown in D, when using a standard recording medium, it is 1.0 when using a high-density recording medium. +1. It becomes H only during the time.

D
The output signal of the type flip-flop I (4) is as shown in Fig. 4 (
As shown in 8), when the standard recording medium is used, it becomes H, and the same <
As shown in (8'), the recording media 1 and L are of high density and have different transmittances. That is, it becomes possible to discriminate between recording media having different recording densities.

Incidentally, the ZF summer end 77 shown in FIG. 3 indicates that the L signal is used for high-density media, and the H signal is used for *$ media.

According to this embodiment, the conventional index detection means is used without adding any special detection means.

Moreover, unlike the conventional example, it is possible to determine the type of recording medium that can be constantly monitored.

〔Effect of the invention〕

According to the present invention, it is possible to distinguish between recording media with different recording densities based on the difference in light transmittance of the recording media without recording or reproducing data. This has the effect of eliminating the need to change the disk device control program, etc.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a floppy disk device equipped with a floppy disk discriminating device, which is used to implement an embodiment of the floppy disk discriminating method according to the present invention, and FIG. 2 is an index signal detection mechanism thereof. FIG. 3 is a circuit configuration diagram of a floppy disk discriminating device according to an embodiment of the present invention, and FIG. 4 is a timing chart thereof. FIG. 5 is a conventional flowchart for determining the type of recording medium. 1... Light-emitting element, 2... Light-receiving element, 3... Recording medium, 4 pieces, LZray 9... Index hole, COMP,... Boat ←
IC1゜IC2, IC3...monostable multivibrator, IC4...D type flip-flop, T...
・Transistor, R1-R10...Resistor, 01-C3
...Capacitor. (1 other person) General Enoki ° ′ grass l Kuchika 2 eyes Kaya A eyes (8゛) zct (L 22-2 nininininini==:=you-1111111 (f7: iJ metesano

Claims (1)

[Claims] 1. In a floppy disk device capable of selectively recording and/or reproducing information on recording media with different recording densities, optical transmittance of recording media with different recording densities A floppy disk discrimination method characterized in that the type of each recording medium is discriminated based on the difference in floppy disks. 2. In the item described in claim 1, the type of recording medium, such as standard or high density, is determined by utilizing the difference in the amount of transmitted light of each recording medium due to the difference in light transmittance of the recording medium. A method for identifying floppy disks. 3. Light transmitted through a recording medium output from an index signal detection mechanism provided in a floppy disk device that is capable of selectively recording and/or reproducing on recording media with different recording densities. 1. A floppy disk discriminating device comprising a discriminating circuit that inputs an output signal based on the amount of light and discriminates recording media with different recording densities based on the input signal.