JPH07134878A - Method for escaping from sucked condition of recording medium and recording/reproducing head of disc apparatus - Google Patents

Abstract

PURPOSE:To make quick access by a recording/reproducing head, by performing an operation one or more times to move the recording/reproducing head from a track position in the outer peripheral or inner peripheral direction and then return to a track position before the movement when the head is sucked. CONSTITUTION:When a DD motor 1 is turned ON in accordance with an instruction from a host system while a disc 2 is inserted in an FDD, it is detected a predetermined time later from the presence/absence of arm input of an index pulse whether the disc 2 is attracted to a magnetic head 4a or 4b. When the disc 2 is sucked, a positioning motor 5 for the magnetic head is excited a predetermined number of steps N while a signal for controlling the rotation of the motor 5 in forward/ backward directions is kept, at a forward low level. As a result, the head 4a, 4b is moved N tracks in the outer peripheral direction of the disc 2. Thereafter, the motor 5 is excited N steps while the signal is turned into a backward high level, so that the head 4a, 4b is moved N tracks in the inner peripheral direction of the disc 2. The disc 2 is separated from the magnetic head 4a, 4b by the sum of the driving force when the head 4a, 4b is reciprocated and driving force of the motor 1 to rotate the disc 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention rotatably drives a disk-shaped recording medium and moves a recording / reproducing head on the medium in the outer peripheral direction or the inner peripheral direction of the medium so that a desired track on the medium is obtained. The present invention relates to an escape method for escaping from an adsorbed state where the medium and the recording / reproducing head are adsorbed in a disk device for recording or reproducing information.

[0002]

2. Description of the Related Art There is a floppy disk device (hereinafter referred to as FDD) as the above disk device. In FDD,
A floppy disk, which is a flexible disk-shaped magnetic recording medium, is rotationally driven, and the magnetic head is moved on the disk in the outer peripheral direction or the inner peripheral direction, so-called seek, and information is read to a desired track on the disk. / Write. Due to the configuration of the host system using this FDD, in order to save power and prevent heat generation, the disk drive motor (hereinafter referred to as DD motor) of the FDD is turned on only when read / write is necessary, and is driven when it is not necessary. It is often turned off to stop the rotation. The rotation of the DD motor with the disc inserted in such a configuration,
That is, when the rotation of the disk is stopped and the rotation stopped state continues for a long time, the disk and the magnetic head are attracted to each other, and even if the DD motor is turned on for reading / writing thereafter, the disk cannot be rotated. Sometimes.

As a method of escaping from such a state where the disk and the magnetic head are attracted to each other, conventionally, the magnetic head is moved by a predetermined number of tracks in one direction of the outer circumference or the inner circumference of the disk while the DD motor is turned on. The method was adopted. This is shown in FIG. As shown in FIG. 7, assuming that the initial track position (hereinafter referred to as the initial head position) of the magnetic head at the time of attraction is the track 62, the magnetic head is moved by 8 tracks to the track 54 in the outer peripheral direction. Due to the combined force of the driving force of the movement of the magnetic head and the force of the DD motor for rotating the disk, the attraction between the disk and the magnetic head is released, and it is possible to escape from the attracted state.

[0004]

The above-mentioned FDD independently performs the escape operation from the adsorption state by the FDD.
The host system such as the computer to which D is connected has no concern. Therefore, when the host system tries to read / write the FDD after the escape from the attracted state, the host system is in the initial head position before the magnetic head moves for the escape from the attracted state. In this case, the direction of movement to the target track for read / write and the number of tracks of the movement amount are designated.

However, in the above conventional escape method, the FD
In D, the magnetic head is moved by a predetermined number of tracks in the outer or inner circumferential direction for ejection, and the magnetic head is at a track position different from the initial head position at the time of adsorption after the ejection. Therefore, after escaping, the magnetic head is moved from the different track position according to the instruction of the host system to read / write.
If you try to write, you will access a track that is different from the target track, which will result in an error. As a result, the host system causes the FDD to move the magnetic head to the outermost track 00 of the disk, and to move it to the target track again. For this reason, there is a problem that the read / write access time after the escape from the adsorption state is very long.

Therefore, an object of the present invention is to solve such a problem, and to access a target track in accordance with an instruction from the host system in a short time after the recording medium and the head in the above-mentioned disk device are released from the attracted state. It is an object of the present invention to provide a method of escaping from an adsorption state that can be carried out immediately without loss.

[0007]

In order to solve the above-mentioned problems, according to the present invention, a disk-shaped recording medium is rotationally driven, and a recording / reproducing head is placed on the medium in the outer peripheral direction or the inner peripheral direction of the medium. In a disk device that moves to record or reproduce information on or from a desired track on the medium, when the medium and the recording / reproducing head are in an attracted state, the recording / reproducing head is in the attracted state. After moving from the track position on the medium to the outer peripheral direction or the inner peripheral direction and then returning to the track position at the time of the adsorption state before the movement, escape from the adsorption state by performing at least one operation. I adopted the escape method.

[0008]

According to such an escape method, since the recording / reproducing head is returned to the track position when it is in the adsorption state after the movement for the escape, the host system responds to the instruction after the escape. The target track can be accessed without error, and can be immediately accessed without loss of time.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

First, FIG. 1 schematically shows a schematic structure of an FDD to which the method of escaping from the adsorption state according to the present invention is applied. In FIG. 1, the spindle 1 of the DD motor 1
The floppy disk 2 is mounted on a and the DD motor 1
It is rotated by the drive of. The magnetic heads 4 a and 4 b mounted on the carriage 3 come into contact with both surfaces of the disk 2. The carriage 3 is moved in the radial direction of the disk 2 by the drive of a head positioning motor (stepping motor) 5, whereby the magnetic heads 4a and 4b are moved in the outer peripheral direction or the inner peripheral direction along the radial direction of the disk. , Data reading / writing is performed on a desired track of the disk 2. The read / write is performed via a read / write circuit (not shown) to which the magnetic heads 4a and 4b are connected.

The drive of the DD motor 1 and the head positioning motor 5 is controlled by the control circuit 8 via the drivers 6 and 7. A DD motor ON signal for instructing the control circuit 8 to turn on / off the DD motor 1 from a host system (not shown), a direction signal for instructing a head moving direction,
A step signal instructing the movement of one track of the head is input, and in response to this, the control circuit 8 controls the drive of the motors 1 and 5 to rotationally drive the disk 2 and the magnetic heads 4a and 4a.
Move b.

An index detector 9 for detecting an index hole (not shown) formed in the disk 2 or an index magnet fixed to a rotor (not shown) of the DD motor 1 is connected to the control circuit 8. The detector 9 detects an index hole or an index magnet, and generates one index pulse for each rotation of the disk 2.

Next, an escape method according to the present invention when the disk 2 and the magnetic heads 4a and 4b are attracted to each other in the FDD having the above structure will be described with reference to FIGS.

The flowchart of FIG. 2 shows the processing procedure of the control circuit for escaping from the adsorption state. First, assuming that the disk 2 is inserted into the FDD and the DD motor 1 is turned off (step S1), when the DD motor 2 is turned on according to an instruction from the host system (step S2), a predetermined time t elapses. After that, it is determined whether or not the disk 2 and the magnetic heads 4a and 4b are attracted by the presence or absence of the input of the index pulse from the index detector 9 (step S3). In other words, when not adsorbed, as shown in the timing chart of FIG.
When the D motor ON signal is set to an active low level and the DD motor 2 is turned on, the DD motor 2 immediately rotates, and an index pulse is generated as the disk 2 rotates. Further, in the case of adsorption, as shown in the timing chart of FIG. 4, even if the DD motor 2 is turned on and the predetermined time t has elapsed, the DD motor 2 does not rotate and no index pulse is generated.

As a result of the above judgment, when the magnetic head 4 is not adsorbed, the magnetic head 4 is responsive to the instruction from the host system.
Then, a and 4b are moved to the target track for read / write, and read / write is started (step S6).

On the other hand, in the case of adsorption, first, as shown in FIG. 4, the motor 5 is rotated a predetermined number of steps while the level of the signal for controlling the forward / reverse rotation of the head positioning motor 5 is set to the low level of forward rotation. The magnetic heads 4a and 4b are excited by N, for example, 4 steps, and moved by 4 tracks in the outer peripheral direction of the disk 2 (step S4).

Subsequently, the level of the signal for controlling the forward / reverse rotation is set to the high level of the reverse rotation, and the motor 5 is excited by the same number of steps N, for example, 4 steps, and the magnetic heads 4a and 4b are moved toward the inner circumference of the disk 2 for 4 tracks. It is moved (step S5).

By the processing of steps S4 and S5, as shown in FIG. 5, assuming that the initial head position at the time of adsorption is the track 62, the magnetic head is first moved from the track 62 by 4 tracks in the outer peripheral direction to the track 58. After being moved, it is moved four tracks in the inner circumferential direction, and track 6
Return to 2. By the combined force of the driving force of this reciprocating movement and the driving force of the DD motor 1 for rotating the disk 2, the attraction between the disk 2 and the magnetic heads 4a and 4b can be released, and the attraction state can be escaped.

After escaping from the attracted state in this way, the magnetic heads 4a and 4b are moved to the read / write target track in accordance with an instruction from the host system, and read / write is performed.
Writing is started (step S6). Here, since the movement of the magnetic heads 4a and 4b in accordance with the instruction from the host system is performed from the initial head position at the time of attraction, as in the case of the conventional escape method described above with reference to FIG. There is no need to move the head, and access can be made immediately without loss of access time. Further, by making the total amount of reciprocating movement of the head for escape from the adsorption state equal to the amount of movement in one direction in the conventional method, the energy at the time of escape can also be made equal.

Of course, the amount of movement in the outer peripheral direction and the inner peripheral direction for the escape is not limited to four tracks, and it is first moved in the inner peripheral direction and then returned in the outer peripheral direction. Of course, it may be possible to do so.

In order to escape, as shown in FIG. 6, for example, the magnetic head is moved from the track 62 at the initial head position at the time of attraction by 2 tracks in the outer peripheral direction and then by 2 tracks in the inner peripheral direction to the initial position. It is also possible to return to the head position, further move two tracks in the inner circumferential direction, and then move two tracks in the outer circumferential direction to return to the initial head position. That is, after the movement from the initial head position in the outer peripheral direction or the inner peripheral direction, the operation of returning to the initial head position may be performed twice or three times or more. In short, the magnetic head may be moved so as to finally return to the initial head position. It should be noted that such an escape method is not limited to FDD, and may be similarly applied to any disk device capable of attracting a disk and a head.

[0022]

As is apparent from the above description, according to the present invention, when the disc-shaped recording medium and the recording / reproducing head are attracted to each other in the disc device, the recording / reproducing head is set to the adsorption state. When the suction is performed, the suction is performed by performing at least one operation of moving the track from the track position on the medium in the outer circumferential direction or the inner circumferential direction and then returning to the track position when the suction state before the movement is achieved. Since I adopted the escape method to escape from the state,
Since the read / write head returns to the track position when it was in the adsorption state after the move for escape, the target track can be accessed after the escape according to the instruction from the host system without making a mistake in the track. The excellent effect is that it can be carried out immediately without loss of time.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a schematic configuration of an FDD to which a method of escaping a disk and a magnetic head from an attracted state according to the present invention is applied.

FIG. 2 is a flowchart showing a processing procedure of a control circuit for escape from an adsorption state in the FDD.

[Fig. 3] DD motor ON signal and D when not in a suction state
It is a timing chart figure of the rotation speed of a D motor.

FIG. 4 is a timing chart of a DD motor ON signal, a DD motor rotation number, a head positioning motor excitation signal, and a normal / reverse rotation control signal of the same motor when exiting from the suction state.

FIG. 5 is an explanatory diagram showing a state of movement of a magnetic head for escape.

FIG. 6 is an explanatory diagram showing another example of movement for escape.

FIG. 7 is an explanatory diagram showing a state of movement of a magnetic head according to a conventional escape method.

[Explanation of symbols]

 1 DD motor 2 Floppy disk 3 Carriage 4a, 4b Magnetic head 5 Head positioning motor 6, 7 Driver 8 Control circuit 9 Index detector

Claims (1)

[Claims] 1. A disk-shaped recording medium is rotatively driven, and a recording / reproducing head is moved on the medium in an outer peripheral direction or an inner peripheral direction of the medium to record or reproduce information on a desired track on the medium. In the disk device to be performed, when the medium and the recording / reproducing head are in the attracted state, the recording / reproducing head is moved from the track position on the medium in the attracted state to the outer circumferential direction or the inner circumferential direction. After that, the recording medium and the recording / reproducing head of the disk device are ejected from the adsorption state by performing at least one operation of returning to the track position when the adsorption state before the movement is reached. How to escape from.