JPS6289269A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To minimize the damage of a magnetic disk device by providing a protecting circuit which performs the recording and saving actions after detecting the impact vibrations, thereby recording immediately a state when the impact vibrations are received in an active mode or a pause mode in order to prevent the transmission of injuries. CONSTITUTION:Both horizontal and vertical pickups 1 and 2 detect the impact vibrations if some impact vibrations are produced and the vibrations is DC- outputted by an amplifier 3. When a switching circuit 4 is in an active mode, a level deciding circuit 5 decides the input level to display and record it at a display/record part 5. Thus the writing/reading actions and then a seeking action are inhibited and a magnetic head is set back to its go-home mode 9. When the circuit 4 is set under a pause mode, a level deciding circuit 13 decides the input level and records it to a display/record part 14. Then a drive inhibiting means 15 is actuated when the input level is higher than a certain value. Thus an operator can know the intensity of the impact vibrations according to the record of the part 6. This can minimize the damage due to the transmission of injuries to another data face.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic disk drive, and more particularly to a magnetic disk drive having an impact vibration detection pickup and an impact vibration detection protection circuit.

2. Description of the Related Art Magnetic disk drives are generally constructed to maintain a minimum distance between a magnetic disk plate and a magnetic head, and are extremely sensitive to shocks and vibrations. If impact vibration is applied to the magnetic disk drive due to some reason (such as an earthquake) and there is contact between the magnetic disk plate and the magnetic head, the storage surface of the magnetic disk plate may be damaged (usually referred to as a head crash). , it will destroy the contents of important data storage area. Therefore, it is necessary to minimize shock vibrations when they are applied to the magnetic disk drive.

Conventionally, in order to prevent this kind of damage, this type of magnetic disk device has been moved by methods such as moving the magnetic head away from the data area on the magnetic disk surface and positioning it in a safe area during transportation and storage. However, they did not have any special means for operation.

Therefore, if impact vibration is applied, the head crash will also propagate to several locations and cause major damage, so it is recommended to check the magnetic head and magnetic disk plate of the magnetic disk drive based on the situation in which the read error occurred. This method was used to deal with the problem.

For this reason, there is a drawback that a large amount of time and man-hours are required for confirmation. Furthermore, during transportation and storage, when a large shock vibration is applied, there is a drawback that if the device is started as it is, unexpected problems such as dust adhering to the magnetic head can damage the magnetic disk plate.

Problems to be Solved by the Invention The purpose of the present invention is to solve the above-mentioned drawbacks, namely, when impact vibration is applied, a head crash propagates to the magnetic disk plate, and inspection thereof requires a lot of time.

An object of the present invention is to provide a magnetic disk device which solves the problem of requiring a lot of man-hours.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a pickup that detects impact vibration, an amplifier that amplifies the electrical output signal of this pickup, and a switch that switches depending on the state of the device. circuit, an operation mode level judgment circuit section (1) that judges the output signals from the amplifiers respectively switched by this switching circuit, and distributes them to appropriate operation means, and a rest mode level judgment circuit section (2). ) and a display/recording section for recording and displaying impact vibrations, and this level judgment circuit section (1) has a display/recording section for recording and displaying impact vibrations.

It is equipped with means for stopping write/read operations, prohibiting seek operations and going home, reporting to a host device, and canceling normal operation when the power is turned off and shock vibration subsides. ) is equipped with a means for recording the display on the display recording section and prohibiting the start of the drive, and a rechargeable or battery power supply section.

Operation Since the present invention is configured as described above, during operation when the switching circuit is switched to the operating mode, the level judgment circuit section (1) judges the amplifier output of the shock vibration detected by the pickup. , depending on the strength of the amplifier output, the operation is stopped, seek operation is prohibited, go home, the power is turned off, the report is sent to the host device, and the impact vibration is displayed and recorded in the display and recording section.When the impact vibration subsides, this After checking the display record of the display recording section and performing appropriate processing, the normal operation is released, and even in the pause mode, the level judgment circuit section (2) is operated by the power supply section,
Drive start is prohibited depending on the strength of the amplifier output,
A display record indicating the degree of impact vibration and the prohibition of drive start can be recorded in the display recorder, and when the mode is changed from the rest mode to the operation mode, the display record can be checked before the operation is started.

Example Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, which shows a block diagram of an impact vibration detection protection circuit in a magnetic disk drive according to an embodiment of the present invention,
The magnetic disk drive of the present invention includes horizontal and vertical pickups 1 and 2 for detecting impact vibrations, an amplifier 3 for amplifying their outputs, a switching circuit 4 for switching between an operating mode and a rest mode, and this switching circuit. 4, the output of the amplifier 3 is switched and connected to the operating mode level judgment circuit (1) 5 and the rest mode level judgment circuit + 2).
13, display recording sections 6 and 14, and power supply section 1 during rest
2, the level judgment circuit (1) 5 sends a report to the host device 9 displays the display on the recording section 6, prohibits writing and reading operations 7.7- prohibits drilling and operation 8. Move to go-home mode9. The level judgment circuit (2) 13 includes means for power-off 10 and return to the normal working mode 1), and the level judgment circuit (2) 13 records the display on the display recording section 14 and prohibits drive start 15.
It has the means of

Next, using FIG. 1, the operation will be specifically explained during operation and during rest.

First, in the operating mode, that is, when power is supplied to the magnetic disk drive and it is used for business purposes, when it receives some kind of shock vibration (such as an earthquake), this is detected by the horizontal and vertical pickups 1 and 2, and the amplifier 3 provides DC output. When the switching circuit 4 is in the operation mode, this DC output is input to the level judgment circuit section (1) 5, and the level judgment circuit section (1) is input to the level judgment circuit section (1) 5.
1) In step 5, the input level is determined and transmitted to the display/recording section 6 for display and recording, and in order to prevent damage from propagating to other data surfaces, write and read operations are performed by the write/read prohibition means 7. The seek operation for driving the magnetic head is prohibited by a seek operation inhibiting means 8, and the magnetic head is returned to a go-home mode 9. When a larger impact vibration is received, actions such as turning off the power to the magnetic disk drive using means 1° are performed for safety reasons.

Therefore, the operator can know the strength and duration of the impact vibration by recording the information on the display unit 6, and by performing the above-mentioned evacuation operation, the operator can minimize damage propagation to other data surfaces. This allows damage to be dealt with quickly. Furthermore, these states can be sent to the higher-level device, and the state of the magnetic disk device can also be determined by the higher-level device.

When the impact vibration subsides, it is determined that there is damage, and if normal use is possible, the normal operation mode 1) is restored.

Next, when the magnetic disk drive receives some kind of shock or vibration in the rest mode, i.e., when it is being transported, stored, etc. and the power is not being supplied to it, this is detected by the horizontal and vertical pickups 1.2. When the amplifier 3 outputs a DC signal, the switching circuit 4 is in the rest mode, and the signal is inputted to the level judgment circuit (2) 13 via the power supply part 12 in the rest state. The level determination circuit section (21) 3 determines the input level and transmits it to the display recording section 14 for recording. Furthermore, when the output level of the amplifier 3 is above a certain level, the drive inhibiting means 15 is activated.

Therefore, when power is supplied and the magnetic disk storage is used, the operator is informed by the display/recording section 14 that shock vibration has been applied, and the drive is prevented from starting to prevent damage from propagating. Damage can be prevented to a minimum and countermeasures can be taken promptly.

Effects of the Invention As explained above, according to the present invention, by providing a protection circuit that detects impact vibration, records it, and evacuates it,
Whether it is in operation or at rest, when it receives impact vibration, it immediately records the condition and prevents the propagation of damage.
This has the effect that damage can be minimized and a highly reliable magnetic disk device can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a collision detection and retention circuit in a magnetic disk drive according to an embodiment of the present invention. 1...Impact vibration detection pickup (for horizontal detection), 2...Impact vibration detection pickup (for vertical detection), 3...Amplifier, 4... Switching circuit, 5...Level judgment circuit section (1), 6...
...Display - Recording section (operating mode), 7...
Write and read operations prohibited, 8... Seek operations prohibited, 9... Go home mode, 1o... Power off, 1)... Normal operation mode, 12... ...
...Power supply unit (rest mode), 13...Level judgment circuit part (2), 14...Display/recording part (rest mode), 15...Drive Start M stop. J glaze F gradient

Claims (1)

[Claims] A magnetic disk drive having at least means for switching between an operating mode and a rest mode includes a pickup that detects shock or vibration, an amplifier that amplifies the output signal of the pickup, a switching circuit that switches the output of the amplifier, and a switching circuit that switches the output of the amplifier. A level judgment circuit section (1) in an operating mode and a level judgment circuit section (2) in an idle mode which are switched and connected by a circuit, and a display recording section for displaying and recording shocks or vibrations are provided, and the level judgment circuit section (1) includes determining various output levels of the amplifier, recording the display in the display recording section, stopping write/read operations, prohibiting seek operations and going home, reporting to the host device, power-off, and impact. The level judgment circuit section (2) includes a means for canceling the normal operation when the vibration subsides.
Similarly, the magnetic device is characterized by comprising means for determining the output level of the amplifier, recording the display in the display recording section, prohibiting drive start, etc., and a power supply section (rechargeable or battery). disk device.