JPS62205571A - Memory device - Google Patents

Abstract

PURPOSE:To prevent the erasure accident of the information stored on a disk by detecting the pulse intervals of a revolution pulse signal within the starting time of a device. CONSTITUTION:The rotating speed of the disk 3 is made slower to rise in the abnormal stage than in the normal stage by the friction resistance of the disk 3 and head 6 in the starting stage of a rotating device 2. The rotating speed of the disk 3 is, therefore, slower in the abnormal stage than in the normal stage upon lapse of the prescribed time since the point of the time when the device 2 is started at the same time. The pulse intervals of the revolution pulse signal from a revolution detector 8 is detected by counter means 22, 24. The detected pulse intervals are longer in the abnormal. stage than in the normal stage. A slight increase of the probability to generate the erasure accident of the information stored on the disk arising from the accident to allow the head to float from the disk is thereby detected and therefore, the erasure accident is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a storage device used in electronic computers, computer peripheral terminal equipment, and the like.

[Conventional technology]

Figure 9 is an example! Terakai Publication No. 60-101777, Electronics (April 1985 issue, hard disk,
P60-P65. Ohmsha) and software knowledge (
Written by Mitsuji Yada, 1982, P75-P83. Ohmsha)
1 is a configuration diagram showing a conventional magnetic disk device used as an example of a storage device shown in FIG.

In the figure, 1 is a support stand, 2 is a rotating device such as a spindle motor attached to the support stand l, and 3 is a rotating device! A disk, such as a magnetic disk, as a recording medium mounted on a rotating shaft 2, a pressure spring 4 fixed to an arm 5 at one end, and a head such as a magnetic head for recording and reproducing at the other end. 6 is attached facing upward. 7 is a support mechanism that supports the arm 5; 8 is a rotation detector that detects the rotational position of the disk 30 according to the rotation device 2 and outputs a rotation pulse signal. 9 is a head moving mechanism incorporating the support mechanism 7 to move the head 6 in the radial direction of the disk 3; 10 is a head drive circuit for driving the head moving mechanism 9;

11 is a recording/reproducing circuit that outputs a recording signal to the head 6 to write information on the disk 3, and uses a signal read from the disk 3 via the head 6 as a reproduction signal; 12 is a disk drive circuit; The rotating device 2 is driven to rotate.

Reference numeral 13 denotes a control device, which incorporates, for example, a central processing unit, inputs rotation pulse signals from the rotation detector 8, centrally controls the head drive circuit 10, recording/reproducing circuit 11, and disk drive circuit 12, and controls an electronic computer ( (not shown), inputs information to be recorded on the disc, and outputs information reproduced from the disc 3.

Next, the operation will be explained. While the rotating device 2 and the disk 3 are at rest, the head 6 is in contact with the recording surface of the disk 3 due to the upward pressing force of the pressure spring 4 that presses the head 6.

When the rotating device 2 is driven to rotate when the disk drive circuit 12 receives a starting start command from the control device 13 to start the rotating device 2, the disk 3 rotates, and the viscous air flow generated on the surface of the disk 3 rotates the rotating device 2. A downward buoyant force is generated on the head 6, and the head 6 gradually begins to float above the recording surface of the disk 3.

On the other hand, when the disk 3 rotates, a rotation pulse signal is output from the rotation detector 8. The control device 13 controls the rotation of the rotating device 20 through the disk drive circuit 12 in accordance with this rotation pulse signal so that the rotation of the rotating device 20 becomes a steady rotation of, for example, 3600 rpm.During steady rotation of the rotating device 2 and the disk 3 In this case, the buoyant force is balanced with the pressure force of the pressure spring 4 that presses the head 6, and a small gap is maintained between the disk 3 and the head 6. This allows the head 6 to press against the disk 3. placed facing each other.

In this state, when a recording or reproducing command is sent from an electronic computer (not shown) to the recording/reproducing circuit 11 via the control device 13, the recording/reproducing circuit 11 controls the recording/reproducing circuit 11 to write a command to the disk 3 via the head 6. Information is recorded or reproduced from the disc 3. Of course, at this time, the head moving mechanism 9 receives a drive command from the control device 13 via the head drive circuit 10 so that the head 6 is positioned on a predetermined track of the disk 30, and the head moving mechanism 9 moves the support mechanism 7 in the radial direction of the disk 3. drive

Next, in braking the rotating device lt2, a drive stop command is given from the control device 13 to the disk drive circuit 12,
When the rotation of the rotation device 2 by the disk drive circuit 12 ceases, the rotational speed of the rotation device 2 and the disk 3 is slowed down due to braking, so the buoyancy of the head 6 becomes smaller than the pressing force of the pressure spring 4, and the head 6 gradually approaches the surface of the disk 3, and when the rotation stops, the head 6 disk 3
comes into contact with the recording surface.

[Problem that the invention seeks to solve]

Conventional storage devices are configured as described above, so if dust generated from inside the storage device moves in and out of the tiny gap between the head and the disk, or if the storage device is subjected to strong vibrations or shocks from outside, the head may become damaged. There are problems in that the head or the disk is gradually damaged by indirect or direct contact with the disk, and after a long period of time, the head becomes unable to fly above the disk and the information stored on the disk is lost.

This invention was made in order to solve the above-mentioned problems, and in order to prevent the accident of loss of stored information on the disk, it is possible to detect when the possibility of the loss of information has increased slightly. The purpose is to obtain a storage device that can be used.

[Means for solving problems]

The storage device according to the present invention, within the startup time of the rotating device,
A detection means is provided for detecting the pulse interval of a rotation pulse signal output from a rotation detector that detects the rotational position of a disk mounted on a rotation device.

[For production]

In the storage device according to the present invention, when the head and/or the disk starts to be scratched, the scratches increase the frictional resistance between the head and the disk, and when the startup time of the rotating device becomes longer due to the influence of this frictional resistance, the rotation pulse at the time of startup increases. If the pulse interval of the signal is long for a long period of time from the time of start-up, this is detected by the detection means.

〔Example〕

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

FIG. 1 shows a storage device according to an embodiment of the present invention, and in the figure, the same reference numerals 1 to 8 as in FIG. 7 are the same as in the conventional example. 20 is a microcomputer which inputs the rotation pulse signal from the rotation detector 8, and 21 is firmware which is provided in the microcomputer 20 and consists of a flow described below.

Note that this microcomputer 20 may also serve as a part of the control device described in the conventional example. Other parts having the same configuration as the conventional example are not shown.

FIG. 2 is an embodiment showing a flow of the contents of the firmware shown in FIG. 1, and FIG. 3 shows a block configuration of a detection means that implements the flow. In FIG. 3, reference numeral 22 denotes a first counting means, which is reset by an activation start command, counts the clocks of the oscillation means 23, and outputs a counting start permission signal when a predetermined number of clocks have been counted. Reference numeral 24 denotes a second counting means, which is reset by the activation start command, after which a counting start permission signal is input from the counting means 22 of the cylinder 1, and then oscillation starts from the time when the first rotation pulse signal is input from the rotation detector 8. Counting of the clock from the means 23 is started. This counting is continued until the next rotation pulse signal is input from the rotation detector 8. Reference numeral 25 denotes comparison and determination means, which includes memory means 2 for predetermined values.
A detection signal is output by comparing the predetermined value stored in advance in 6 and the count value by the second counting means 24.

It should be noted that the detection means is composed of components indicated by symbols 22 to 26 within the broken lines.

Next, the operation of this embodiment will be explained. Rotating device 2
Waits until a start-up command is issued to (step Sl)
). When a start command is issued, the counting means (first and second counting means 27, 28) are reset (step 82).
. Next, wait until a predetermined time has elapsed (step 83).
. After a predetermined period of time has elapsed, it is determined whether or not the rotation pulse signal from the rotation detector 8 is a warning (step S4). When it is determined that a rotation pulse signal has been generated, the internal clock is counted (step 85). This counting operation is continued until the next rotation pulse signal is generated from the rotation detector 8. When it is affirmatively determined that the next rotation pulse signal has been generated from the rotation detector 8 (affirmative determination in step S6), the counting operation is stopped (step 87). It is determined whether the counted value is greater than or equal to a predetermined value (step S8). If it is judged to be above a predetermined value, it is judged to be normal and the return operation is not performed.If it is judged to be above a predetermined value, it is judged that the frictional resistance between the disk 3 and the head 6 is large and abnormal, such as a pulse etc. A detection signal is output (step S9), and the process returns.

Normally, when the rotating device 2 is started, the rotational speed of the disk 3 rises slower in an abnormal state than in a normal state due to frictional resistance between the disk 3 and the head 6. Therefore, when a predetermined period of time has elapsed from the starting point of the rotating device 2 at the same time, the rotational speed of the disk 3 is slower in the abnormal state than in the normal state. This means that at that time, the pulse interval of the rotation pulse signal output from the rotation detector 8 is longer in the abnormal state than in the normal state. Therefore, in this embodiment, whether the pulse is normal or abnormal is detected by detecting the pulse interval at that time.

In the case of this embodiment, step s6 may be set to "Have the number of rotation pulse signals input from the rotation detector 8 reached a predetermined number?", and the interval between three or more rotation pulse signals may be measured and detected. .

FIG. 4 is a flowchart of another embodiment showing the contents of the 7 arm 7 shown in FIG. 1, and FIG. 5 shows the configuration of the detection means that realizes the flow. In FIG. 5, 30 is a timer means which starts operating in response to a start command and outputs a timer clock after a predetermined time, and 31 is a third counting means which counts the rotation pulse signal from the rotation detector 8 in response to a start command. The counting is started and stopped by the timer clock from the timer means 30. 32 is a comparison/judgment means that compares the count value of the third counting means 31 with a reference value stored in advance in the predetermined value memory means 26 and outputs a detection signal. In this embodiment, the rotation detector 80 counts the rotation pulse signals for a predetermined period of time from the starting point of the rotation device 2, detects the magnitude of the counted value, and outputs a detection signal. It should be noted that the detection means is composed of components indicated by reference numerals 26, 30 to 32.

Next, the operation of this embodiment will be explained. It waits until a startup start command is issued (step 510).

When it is affirmatively determined that the activation start command has been generated (affirmative determination in step 810), a timer operation is started to generate a timer clock (step 511). From the time when the timer starts operating, the rotation pulse signals output from the rotation detector 8 are counted (step 812). This counting operation proceeds with an affirmative determination that the timer clock has occurred (affirmative determination in step S13). If it is affirmatively determined that the timer clock has occurred, counting is stopped (step 514). This count value is the number of rotation pulse signals output from the rotation detector 8 during a predetermined period of time from the starting point. Naturally, the frictional resistance between the disk 3 and the head 6 when the rotating device 2 is started is greater in an abnormal state than in a normal state, so the rise in the rotational speed of the disk 3 in an abnormal state is the same as the rotational speed of the disk 3 in a normal state. slower than the rise of

Therefore, the count value is relatively larger during normal times than during abnormal times.

Next, the process moves from step 314 to the next step, where it is determined whether the counted value is greater than or equal to a predetermined value (step S15).
). If it is determined in the affirmative that it is equal to or greater than the predetermined value, it is determined to be normal and the process is returned to normal.

If the negative determination is that it is less than the predetermined value, it is determined that there is an abnormality, and a detection signal such as a pulse is output in step S1.
6), return.

Further, as a modification of this, the rotation pulse signal of the rotation detector 8 may be counted for a predetermined time after a predetermined time has elapsed from the start time.

Note that in each of the above embodiments, a start-up command is used, but it does not have to be a start-up command, but may be a control signal that is output a predetermined time after the start-up command.

Fig. 'fC6 is a flowchart of another embodiment showing the contents of the firmware shown in Fig. 1, and Fig. 7 shows the configuration of the detection means implementing step 7o-.

In FIG. 7, 23, 25, and 26 are the same as those in FIG. When the pulse signals are counted and a predetermined number of pulse signals are counted,
It outputs a counting start signal, inputs the next rotation pulse signal, and outputs a counting stop signal at 9 o'clock. 41 is a second counting means that counts the clocks from the oscillation means 23 according to the signal from the first counting means. The frequency of the oscillation pulse of this oscillation means 23 is much higher than the maximum frequency of the rotation pulse signal of the rotation detector 8. Note that the detection means is indicated by the symbol 23 within the broken line.
．． It is composed of the components shown in 25.26.40.41.

Next, the operation of this embodiment will be explained. Rotating device 2
Waits until a start-up command is issued (step 52).
1). When a start-up command is generated, the start-up command causes the counting means (the first and second counting means 40 in FIG. 7) to start.
41) is reset (step 522). The process waits until a predetermined number of pulses are input from the rotation detector 8 (step 523). After inputting a predetermined number of pulses, the internal clock (clock output from the oscillation means 23) is counted (step 524). This counting is continued until the next rotation pulse signal is input from the rotation detector 8 (step S25). When it is affirmatively determined that the next rotation pulse signal has been input (affirmatively determined in step 825), counting of the internal clock is stopped (step 826). It is determined whether this count value is within a predetermined value by comparing it with a predetermined value (step 527).

If it is affirmatively determined that the counted value is within the predetermined value, it is determined that the relationship between the disk 3 and the head 6 is normal, and the process is returned to normal. If it is determined that the counted value exceeds a predetermined value, it is determined that the relationship between the disk 3 and the head 6 is abnormal, and a pulse or the like is output as a detection signal (step 828), and the process returns.

FIG. 8 shows an example of application of the present invention, in which 50 and 52 are the first and second magnetic disk drives shown in FIG. It is. When the above-described detection signal is sent from the first magnetic disk device 50 to the computer 51, the computer 51 immediately issues a command to the first magnetic disk device 50, and
Before the head 6 of the magnetic disk drive 50 becomes unable to fly above the disk 3, the information is reproduced from the disk 3 and the reproduced information is stored in the second magnetic disk drive 52, thereby preventing the loss of stored information. Accidents can be prevented.

In each of the above embodiments, the rotation detector S may use rotational position information obtained from the disk 3 via the head 6, and the same effects as in the above embodiments can be achieved.

Further, in each of the above embodiments, the head is used for recording and reproducing, but it may also be used only for recording or reproducing, and in this case, the recording and reproducing circuit can be replaced by a recording circuit or a reproducing circuit.

Further, in each of the above embodiments, the case of a magnetic disk device has been described, but bell sound as a well-known storage device applying a well-known optical method, magneto-optical method, laser method, electric field method, electric charge method, or other method may be used. It may also be a recording device or other storage device.

Alternatively, a computer may be used instead of the microcomputer, software may be used instead of firmware, and an electronic computer control device may be used instead of the microcomputer and firmware, and the same effects as in the above embodiments can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, when starting up the rotating device,
Since the configuration is configured to detect the pulse interval of the rotation pulse signal output from the rotation detector that detects the rotational position of the disk, it is possible to prevent the loss of information stored on the disk due to an accident in which the head is unable to float above the disk. This has the effect of being able to detect that the possibility of a loss has increased slightly, and thereby preventing such disappearance accidents.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a storage device according to an embodiment of the present invention;
Fig. 2 is a flow diagram of one embodiment of the firmware shown in Fig. 1, Fig. 3 is a block diagram for realizing the flow shown in Fig. 2, and Fig. 4 is a 70% diagram of another embodiment of the firmware shown in Fig. 1.
Fig. 5 is a block diagram for realizing the flow shown in Fig. 4, Fig. 6 is a flow diagram of another embodiment of the 7 armware shown in Fig. FIG. 8 is a block diagram showing an example of application of the present invention, and FIG. 9 is a block diagram showing a conventional storage device. In the figure, 2 is a rotating device, 3 is a disk, 6 is a head, 8 is a rotation detector, 13 is a control device, 20 is a microcomputer, 21 is firmware, 22 is a first counting means, 23 is an oscillation means, 24 25 is a second counting means, 25 is a comparison and determination means, and 26 is a predetermined value memory means. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A rotation device rotates a disk as a recording medium, a rotation detector detects the rotational position of the disk, a rotation pulse signal output from the rotation detector is input, and a rotation control device controls the rotation of the rotation device. In a storage device in which a head used for controlling and recording and/or reproducing information on the disk is arranged opposite to a recording surface of the disk, the rotation control device starts the rotation device. A start-up command is input, and when the rotating device is started, immediately after a predetermined period of time has elapsed since the starting point of the rotating device, or immediately after the disk has rotated by a predetermined number of rotations from the starting point, the rotation detector is activated. A storage device comprising a detection means for detecting an interval between pulses of a rotation pulse signal.