JPH06103580B2 - Floppy disk device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a floppy disk device using a floppy disk having a servo pattern recorded therein, and more specifically, a floppy disk having a servo pattern recorded therein. And a floppy disk device capable of recognizing different types of floppy disk in which servo patterns are not recorded.

(Prior Art) FIG. 2 is a block diagram showing an example of this type of floppy disk device.

When the floppy disk 1 is attached to the driving mechanism including the spindle motor 6, the disc in sensor 5 identifies that the floppy disk is attached.

The output of the disk sensor 5 is sent to the motor control circuit 10,
As a result, the motor control circuit 10 starts the rotation of the spindle motor 6. When the spindle motor 6 starts to rotate, the index sensor 7 turns the spindle motor 6 to 1
One pulse is output to the rotation speed detection circuit 8 each time the circuit is rotated.

The rotation speed detection circuit 8 detects the rotation speed of the spindle motor by measuring the interval between the pulses output from the index sensor 7. When the speed is within the predetermined range, a signal is output to the motor control circuit 10.

When a signal is input from the rotation speed detection circuit 8, the motor control circuit 10 stops the rotation of the spindle motor 6 and starts the mounting operation.

As described above, when the floppy disk is conventionally mounted on the driving mechanism, it is confirmed that the floppy disk is properly mounted by rotating the spindle motor and detecting that the rotation speed is stable. , The rotation of the spindle motor was stopped and the mounting operation was ended.

(Problems to be Solved by the Invention) By the way, the conventional floppy disk device has a means for determining whether or not the floppy disk has a servo pattern recorded when the floppy disk is mounted on the driving mechanism. I didn't have it.

Therefore, since the floppy disk device itself cannot identify the type of floppy disk, if you accidentally install a floppy disk with a servo pattern recorded that is different from the desired floppy disk, the servo pattern There is a possibility of destroying. For example, if a floppy disk with a servo pattern recorded is mistakenly installed and a format command is issued from an external host device, the format with the servo pattern recorded will be destroyed, and the servo pattern will be self-formatted. I can't, so this flotspy disc becomes useless.

The object of the present invention is to solve the above-mentioned drawbacks, and by determining whether or not a servo pattern is recorded when the floppy disk is mounted, even if an incorrect command is input to the host device, It is an object of the present invention to provide a floppy disk device that does not destroy the servo pattern of the floppy disk.

(Means for Solving the Problem) In order to achieve the above-mentioned object, a floppy disk device according to the present invention is compatible with the first recording density of the floppy disk in which a servo pattern for magnetic head positioning is recorded. In the floppy disk device, which can read / write by reading and writing, and can read / write corresponding to a recording density different from the first recording density which does not require the servo pattern, the floppy disk is mounted on the driving mechanism. And a motor control circuit that detects that the floppy disk is mounted and rotates the spindle motor,
A rotation speed detection circuit that measures the rotation speed of the spindle motor and detects that the rotation speed is within a predetermined range, and a signal indicating that the rotation speed has reached the predetermined range from the rotation speed detection circuit are received. At this time, the servo pattern recorded on the floppy disk within a fixed time after receiving this signal is identified, and a servo pattern detection signal corresponding to the presence or absence of this servo pattern is output to the outside of the floppy disk device and Servo pattern detecting means for sending a control signal for stopping the rotation of the spindle motor to the motor control circuit after a predetermined time has passed.

(Example) Hereinafter, the present invention will be described in more detail with reference to the drawings.

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

When the floppy disk 1 is mounted on the driving mechanism including the spindle motor 6, the diskin sensor 5 identifies this, and the output of the diskin sensor 5 is sent to the motor control circuit 10.

The motor control circuit 10 thereby starts the rotation of the spindle motor 6.

When the spindle motor 6 starts rotating, the index sensor 7 outputs one pulse to the rotation speed detection circuit 8 every time the spindle motor 6 makes one revolution.

The rotation speed detection circuit 8 detects the rotation speed of the spindle motor by measuring the interval between the pulses output from the index sensor 7. When the speed falls within a predetermined range, signals are output to the servo pattern detection circuit 4 and the delay timer 9 which form the servo pattern detection means 11, respectively.

When the signal is input from the rotation speed detection circuit 8, the delay timer 9 outputs the signal to the servo pattern detection circuit 4 and the motor control circuit 10 after a preset time has elapsed.

When the servo pattern detection circuit 4 receives the signal from the rotation speed detection circuit 8, the servo pattern detection circuit 4 discriminates whether or not the reproduced signal obtained by amplifying the output of the magnetic head 2 by the read / write circuit 3 includes the servo pattern. When the servo pattern is detected, a servo pattern detection signal is output.

On the other hand, if the servo pattern is not detected before the signal is input from the delay timer 9, it is determined that the servo pattern does not exist, and the servo pattern detection signal is not output. The output of the servo pattern detection signal is held unless the work of ejecting the floppy disk and mounting it again is performed. When a signal is input from the delay timer 9, the motor control circuit 10 stops the rotation of the spindle motor 6 and completes the mounting operation.

In this way, during the mounting operation, it is judged whether or not the servo pattern is recorded on the mounted floppy disk, and the servo pattern detection signal corresponding to this result is output to the external control device so that the servo pattern exists. If you do, even if you input a wrong command such as format, by giving the external control device a function that does not execute it,
It is possible to prevent the destruction of the format of the floppy disk in which the servo pattern is erroneously recorded.

(Effects of the Invention) As described above, according to the present invention, when the floppy disk is mounted on the driving mechanism, the servo pattern detecting means for identifying whether or not the servo pattern is recorded on the floppy disk is provided. When the servo pattern is detected, the servo ID detection signal is output to the host device outside the floppy disk device, so that the host device can judge whether or not the servo pattern is recorded. Even if an erroneous command is input to the host device, for example, even if a format command is input, the servo pattern is not erroneously destroyed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a floppy disk device according to the present invention, and FIG. 2 is a block diagram showing a conventional floppy disk device. 1 ... Flotpie disk 2 ... Magnetic head 3 ... Read / write circuit 4 ... Servo pattern detection circuit 5 ... Disk-in sensor 6 ... Spindle motor 7 ... Index sensor 8 ... Rotation speed detection circuit 9 ... Delay timer 10 ... Motor control circuit 11 ... Servo pattern detection means

Claims (1)

[Claims] 1. A first recording density capable of being read / written corresponding to a first recording density of a floppy disk on which a servo pattern for magnetic head positioning is recorded and which does not require the servo pattern. In a floppy disk device capable of reading / writing corresponding to different recording densities, when the floppy disk is mounted on a driving mechanism, a motor control circuit which detects that the floppy disk has operated and rotates a spindle motor And a rotation speed detection circuit that measures the rotation speed of the spindle motor and detects that the rotation speed is within a predetermined range, and a signal indicating that the rotation speed has reached the predetermined range from the rotation speed detection circuit. When this signal is received, the servo pattern recorded on the floppy disk within a fixed time after receiving this signal is identified, and this servo pattern is detected. Servo pattern detection means for outputting a servo pattern detection signal corresponding to the presence or absence of a pattern to the outside of the floppy disk device and sending a control signal for stopping the rotation of the spindle motor to the motor control circuit after the lapse of the predetermined time. A floppy disk device characterized by being provided.