JPH03113866A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To evade a state of infeasibility of recording and reproducing a magnetic disk by counting and recording the number of floating times of a magnetic head. CONSTITUTION:A motor 6 is stared or stopped by a start signal or a stop signal from a revolution control part 8 so that the magnetic disks 1A-1C are rotated and stopped repeatedly, and recording and reproducing operations are performed by the magnetic heads 2A-2C accordingly. Then, the number of start ing times of the motor 6 is counted by a counter 13 and recorded as the number of floating times of the magnetic heads 2A-2C in a recording part 14. Consequent ly, an estimated number of floating times to incur the situation of infeasibility of recording and reproducing the magnetic disks 1A-1C is set separately, and by comparing this set number of floating times with an actual counting value, the approach of a limit can be predicted. By this method, a state of infeasibility of recording and reproducing can be evaded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a magnetic disk device used as an auxiliary storage device in a computer or the like.

[Conventional technology]

@2 Figure is a perspective view showing a schematic configuration of a conventional magnetic disk device.

In the figure, (1) is a magnetic disk for recording information, and (2) is a magnetic head provided opposite the magnetic disk for recording information on the magnetic disk and reproducing recorded information. , 3) are springs that support the magnetic head.

3 and 4 are enlarged schematic diagrams showing the relationship between a magnetic disk and a magnetic head, and as is well known, (1) shows a substrate (b) and a structure provided on this substrate. (4) is a floating body supported on the magnetic disk by the above-mentioned spring (3), and (2) is a magnetic head attached to the end of this floating body. It is.

In such a configuration, when the magnetic disk (1) is stopped, the floating body (4)
It is in contact with the surface of the magnetic disk (1) due to the pressing force of the cover spring (3), but if the magnetic disk (1) is rotating, as shown in FIG. The buoyancy force that acts on the floating body (4) due to the air flow;
At a position where the pressing force of the spring (3) is balanced, the magnetic head floats with a slight gap maintained between it and the magnetic disk.

[Problem to be solved by the invention]

Since the conventional LA disk device is configured as described above, when the magnetic disk is started or stopped, the floating body (4) travels in contact with the surface of the magnetic disk, and the recording medium layer @ wear occurs.

For this reason, although a wear-resistant coating is applied to the surface of the magnetic disk, the wear still progresses, and there is a problem in that it eventually becomes impossible to record and reproduce information correctly.

The present invention has been made to solve these problems, and aims to provide a magnetic disk device that can prevent the situation in which recording and reproduction become impossible.

[Means to solve the problem]

A magnetic disk device according to the present invention is configured to count and record the number of floating times of a magnetic head.

[For production]

According to this invention, since the number of floating times of the magnetic head is counted and recorded, the number of floating times that is assumed to cause a situation in which recording and playback of the magnetic disk are impossible is separately set, and this setting floating number is set separately. By comparing the number of times and the actual count value, approaching the limit can be predicted.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

In this figure, CIA) (IBXIC) respectively support magnetic disks, and (6) supports each magnetic disk.
A spindle driven by a motor (6) to rotate a magnetic disk, (2A) (2BX2C) are magnetic heads provided corresponding to each magnetic disk, (3AX3
BX3C) is a spring that supports each g & air head, (7) is a support part that supports each spring, and (8) is a motor rotation control part, which is controlled by the first switch (9) and the second switch αQ. and is connected to the motor (6).

(to) is a counter that counts the number of floating times n of the magnetic head, and in this embodiment, it detects the power-on of the motor (6) and counts the number of times the motor is activated.

0 fathom is the recording part that records the count results of the counter, and it is the limit number of floating times N that is assumed to cause a situation where recording and reproduction of the magnetic disk is impossible. This value is set by taking into consideration the material and thickness, the material of the floating body, the number of times the magnetic disk has been started and the wear record of the same type of magnetic disk, and this value can also be recorded.

μs is a comparison unit that compares the count result n of the counter with a separately set limit number of floating times N, and when n≧N, it emits a signal and opens the second switch σ0. . Qllll receives the signal from the comparator and determines n≧
A display section for displaying "N" and Q.eta. are other control sections of the magnetic disk device, which transmit and receive recording and reproduction signals of the magnetic disk with an external circuit (not shown). Note that among the above-mentioned switches, the first switch y'' (9) is always kept open, and the second switch GO is always kept closed.

Next, the operation of the embodiment will be explained.

The motor (6) starts or stops in response to a start signal or a stop signal from the rotation control section (8), and the magnetic disks (IA) to (IC) repeat rotation and stop.

The magnetic heads (2A) to (2C) operate as described above in response to this, and perform recording and reproducing operations as in the conventional apparatus.

In this case, the number of times the motor is started is counted by a counter (to), and the number of floating times n of the magnetic head is counted by the recording section 0.
Recorded in 4. The recorded number of floats n is stored in advance in the recording section 0.
Comparison section (to) with the limit number of floats N recorded in 4.
and are compared here.

As a result of the comparison, if n≧N, that is, if there is a high possibility that recording and reproduction of the magnetic disk will not be performed correctly, a signal is emitted from the comparing section 4, and the display section a@ is operated. In addition to displaying that fact, the second switch <1 (l
is opened, the control signal to the motor (6) is stopped, and the operation of the magnetic disk is stopped.

In this case, even if the rotation control section (8) issues the start signal again, the second switch αQ remains open, so the magnetic disk drive will not operate.

Therefore, the information recorded on the LA disk is protected, but since this VI magnetic disk cannot operate any further, it is necessary to read out the information already recorded and transfer it to another recording device. .

In this case, the second switch y″Ql) which is in the open state is left as it is, the first switch (9) is closed, and the rotation control unit (8) issues the CFkIJJ signal to control the rotation of the magnetic disk. (The purpose can be achieved by reading information through the Ilt1 section αη.

The closing operation of the first switch (9) may be automatically performed on the condition that the above-mentioned display is displayed on the display section [alpha].

In the above explanation, the number of times the magnetic head floats is counted by the number of times the motor is activated when the power is turned on.
In the case of emitting a signal, the control signal may be counted, or the vibrations generated as the magnetic disk rotates or the vibrations generated in the magnetic head are detected and counted. be effective.

Further, the recording section for recording the count results may be constructed by any means such as a magnetic disk, a semiconductor memory, or a mechanical recording means.

Furthermore, when the magnetic disk drive is stopped by a signal from the comparing section and then restarted to transfer information recorded on the magnetic disk, the floating position of the magnetic head may be moved to a position different from the normal position. Alternatively, restrictions may be set on the number of times the magnetic disk can be activated and other operating conditions.

〔Effect of the invention〕

As described above, according to the present invention, since the number of floating times of the VT head is counted and recorded, it is possible to avoid a situation where recording and reproduction on a magnetic disk becomes impossible, and a magnetic disk device reliability can be improved.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention, FIG. 2 is a perspective view showing a schematic configuration of a conventional magnetic disk device, and FIGS. 3 and 4 show the relationship between a magnetic disk and a magnetic head. It is a schematic diagram enlarged and shown. In the figure, (1) (IA) (IB) (IC) are magnetic disks, (21 (2A) (2B) (2C) are magnetic heads, (3) (3A) (3B03C) are springs, (4
) is a floating body, (6) is a motor, (8) is a rotation control unit, (
9) (!I is the switch, sub is the counter %, Q41 is the recording section, Q5 is the comparison section, a6 is the display section, αη is the other control 1
There are 11 parts. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A magnetic disk that is rotatably provided and capable of recording information, and a magnetic disk that is provided opposite to the magnetic disk,
When the magnetic disk stops, it touches the surface of the magnetic disk,
In a device equipped with a magnetic head that is capable of floating from the surface of the magnetic disk when the magnetic disk rotates and is configured to record and reproduce information on the magnetic disk, the number of times the magnetic head floats is counted and , a magnetic disk device characterized by recording.