JP2000113571A - Failure analyzing method for magnetic disk device, failure reporting method for magnetic disk device and magnetic disk device utilizing these methods - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a circuit constitution without using a shock sensor even while specifying the cause of failure by judging whether or not the cause of failure is vibration, etc., by comparing respective run-out amt. between the time of the fault occurrence and the time of normal operation by means of the shock sensor, etc., and to suppress the rise of costs and the enlargement of the scale of a device by reducing the number of parts. SOLUTION: A failure analyzing method for a magnetic disk device, by which the cause of the failure is discriminated when the failure occurs in the magnetic disk, involves a vibration and shock judgment process, by which the reference run-out amt. preliminarily recorded in a memory at the time of normal operation is compared with the measured run-out amt. measured at the time of the failure occurrence (Step 107), and if the measured run-out amt. us beyond an appropriate range set in accordance with the reference run-out amt. (Step 108/No.), it is judged that the cause of the failure is vibration or shock (Step 114).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive used for a hard disk or the like of a computer, and more particularly, to a failure analysis method for determining the cause of a failure that has occurred in a magnetic disk drive and a magnetic disk drive for determining the determined cause. The present invention relates to a method for reporting a failure to a higher-level device of the device, and a magnetic disk device using these methods.

[0002]

2. Description of the Related Art Magnetic disk devices having a function of determining the cause of various failures occurring in a magnetic disk device and reporting the cause to a host device have been developed.

For example, a device failure such as an intake air temperature abnormality and a so-called hardware failure is detected, predetermined failure information is created based on the detected failure content, and this failure information is processed for different failure countermeasures for each failure information. There is a magnetic disk device that notifies a higher-level device that executes. In this magnetic disk drive, fault information based on an intake air temperature abnormality is created separately from fault information based on a hardware fault, and reported to a host device (see Japanese Patent Application Laid-Open No. Hei 8-235575).

In addition, it is necessary to specify the cause of a fault in order to create fault information based on the fault content after the fault is detected. For this reason, devices that need to identify the cause of the failure include, for example, a voltage sensor for detecting a voltage, a temperature sensor for detecting a temperature, and a shock sensor for detecting vibration and shock (Japanese Patent Application Laid-Open No. HEI 9-163,019). 59-178556).

[0005]

However, in the above-described magnetic disk drive, various sensors must be provided in order to identify the cause of the failure, which complicates the circuit configuration and increases the number of parts, resulting in cost reduction. And the size of the apparatus may be increased.

Accordingly, the present invention provides a magnetic disk drive fault analysis method, a magnetic disk drive fault reporting method, and a magnetic disk drive using these methods that can reduce the number of sensors to be installed while enabling the cause of the fault to be identified. It is intended to provide.

[0007]

As a technical means for achieving the above object, a failure analysis method for a magnetic disk drive according to the present invention comprises the steps of determining the cause of the failure when a failure occurs in the magnetic disk drive. In the failure analysis method for the magnetic disk device to be determined, the reference runout amount recorded in the memory in advance during normal operation is compared with the measurement runout amount measured at the time of occurrence of the failure, and the measurement runout amount is set based on the reference runout amount. If it is out of the appropriate range, a vibration / impact determination step of determining that the cause of the failure is vibration or impact is provided.

That is, when a failure occurs, it is determined whether or not the cause of the failure is vibration or impact by executing a vibration / impact determination step. Since this determination is made only by internal processing on the circuit, the cause of the failure can be specified without using a shock sensor.

In the magnetic disk drive failure analysis method according to the present invention, the reference runout amount previously recorded in the memory during normal operation is compared with the measured runout amount measured at the time of occurrence of the failure, and the measured runout amount is measured. If the amount is out of the appropriate range set based on the reference runout amount, the magnetic disk drive is operated by correcting the runout amount to an appropriate value within the appropriate range, and the correction eliminates the failure. In this case, the method includes a vibration / impact determination step of determining that the cause of the failure is vibration or impact.

Therefore, the run-out amount is corrected to an appropriate value, and after confirming that the magnetic disk device operates normally, the cause of the fault is specified. Therefore, the accuracy of specifying the cause of the fault can be improved. it can.

Furthermore, in the failure analysis method for a magnetic disk drive according to the third aspect of the present invention, the measured temperature is compared with the reference temperature recorded in advance in the memory and the measured temperature measured at the time of occurrence of the failure. If the temperature is out of the proper range set based on the temperature, a temperature rise determining step of determining that the cause of the failure is a temperature rise is provided.

That is, when a fault occurs, it is determined whether or not the cause of the fault is a temperature rise by executing the temperature rise determining step.

According to a fourth aspect of the present invention, in the failure analysis method for a magnetic disk drive, a reference temperature previously recorded in a memory is compared with a measured temperature measured when a failure occurs, and the measured temperature is set to the reference temperature. If the temperature is outside the appropriate range, the magnetic disk device is cooled by a fan to correct the temperature to an appropriate value within the appropriate range. It is characterized by having a temperature rise determination step of determining that the factor is a temperature rise.

Therefore, the cause of the failure is specified after the temperature is corrected to an appropriate value and the normal operation of the magnetic disk drive is confirmed, and the accuracy of specifying the cause of the failure can be improved.

Further, in the magnetic disk drive failure analysis method according to the present invention, the reference voltage previously recorded in the memory is compared with a measured voltage measured at the time of occurrence of the failure, and the measured voltage is compared with the reference voltage. If it is out of the proper range set based on the voltage, a voltage abnormality determining step of determining that the cause of the failure is voltage abnormality is provided.

That is, when a failure occurs, it is determined whether or not the cause of the failure is a voltage abnormality by executing a voltage abnormality determination step.

Further, in the magnetic disk drive failure analysis method according to the present invention, the reference voltage pre-recorded in the memory is compared with a measured voltage measured at the time of occurrence of the failure, and the measured voltage is compared with the reference voltage. If the error is outside the appropriate range set based on the voltage, the voltage of the magnetic disk device is corrected to an appropriate value within the appropriate range. If the correction does not cause the failure, the cause of the failure is an abnormal voltage. It is characterized by having a voltage abnormality determining step of determining

Therefore, the cause of the failure is specified after correcting the voltage to an appropriate value and confirming that the magnetic disk device operates normally, and the accuracy of specifying the cause of the failure can be improved.

On the other hand, according to a seventh aspect of the present invention, there is provided a magnetic disk drive failure reporting method for determining a cause of the failure and reporting the failure to a higher-level device when a failure occurs in the magnetic disk drive. A failure detecting step of detecting that the failure has occurred when the magnetic disk device does not receive at least one access command from the higher-level device; and a normal operation after the occurrence of the failure is detected. When comparing the reference runout amount previously recorded in the memory with the measured runout amount measured at the time of the failure occurrence, if the measured runout amount is outside the appropriate range set based on the reference runout amount, the cause of the failure is A vibration / impact determination step of determining that the failure is vibration or impact, and a reporting step of reporting the cause to the host device after determining the cause of the failure It is characterized by having a.
Further, in the fault reporting method for a magnetic disk device according to the invention of claim 8, the fault detection detects that the fault has occurred when the magnetic disk device does not receive at least one access command from the host device. After the occurrence of the fault is detected, the reference runout amount recorded in the memory in advance during normal operation and the measured runout amount measured at the time of the fault occurrence are compared, and the measured runout amount is based on the reference runout amount. If it is out of the proper range set in the above, the run-out amount of the magnetic disk drive is corrected to a proper value within the proper range and the operation is performed. And a vibration / impact determination step of determining that the failure is a shock, and a reporting step of reporting the cause to the higher-level device after determining the cause of the failure. It is characterized in that.

Therefore, when a failure occurs, the occurrence of the failure is detected by executing the failure detecting step. Then, by executing the vibration / impact determination step, it is determined whether or not the cause of the failure is vibration or impact, and the result of the determination is reported to the host device by executing the reporting step.

Further, in the fault reporting method for a magnetic disk drive according to the present invention, after the occurrence of the fault is detected, a reference temperature previously recorded in a memory is compared with a measured temperature measured at the time of the fault occurrence. The method according to claim 10, further comprising a temperature rise determining step of determining that the cause of the failure is a temperature rise if the measured temperature is outside the appropriate range set based on the reference temperature. In such a failure reporting method for a magnetic disk device, after the occurrence of the failure is detected, a reference temperature previously recorded in a memory is compared with a measured temperature measured at the time of the failure, and the measured temperature is determined based on the reference temperature. If the temperature is outside the proper range, the magnetic disk device is cooled by a fan to correct the temperature to a proper value within the proper range, and the correction prevents the failure from occurring. If factors of the disorder is characterized by having a temperature rise determination step of determining that the temperature rise.

Therefore, after the occurrence of a failure is detected by the failure detection step, it is determined whether or not the cause of the failure is temperature rise by executing the temperature rise determination step.

[0023] In the magnetic disk drive fault reporting method according to the eleventh aspect of the present invention, after the occurrence of the fault is detected, a reference voltage previously recorded in a memory is compared with a measured voltage measured at the time of the fault occurrence. The method according to claim 12, further comprising a voltage abnormality determining step of determining that the cause of the failure is a voltage abnormality if the measured voltage is out of an appropriate range set based on the reference voltage. Such a failure reporting method for a magnetic disk device, after the occurrence of the failure is detected, compares a reference voltage previously recorded in a memory with a measured voltage measured at the time of the failure, and determines the measured voltage based on the reference voltage. If the error is outside the appropriate range, the voltage of the magnetic disk drive is corrected to an appropriate value within the appropriate range. If the correction does not cause the error, the cause of the error is It is characterized by having a voltage abnormality determination step of determining that the pressure abnormality.

Therefore, after the occurrence of a failure is detected in the failure detection step, it is determined whether or not the cause of the failure is a voltage abnormality by executing the voltage abnormality determination step.

On the other hand, in the magnetic disk drive according to the present invention, when a fault occurs, the reference runout amount previously recorded in the memory during normal operation is compared with the measured runout amount measured at the time of the fault occurrence. If the measured run-out amount is outside the appropriate range set based on the reference run-out amount, a vibration impact judging unit for judging that the cause of the failure is vibration or impact is provided. In the magnetic disk drive according to the present invention, when a failure occurs, the measured runout amount is compared with a reference runout amount previously recorded in a memory during normal operation and the measured runout amount measured at the time of the failure occurrence. If the amount is out of the appropriate range set based on the reference runout amount, the magnetic disk drive is operated by correcting the runout amount to an appropriate value within the appropriate range, and the correction eliminates the failure. In this case, the apparatus has a vibration / impact determination unit that determines that the cause of the failure is vibration or impact.

That is, when a failure occurs, the vibration / impact determination unit determines whether the cause of the failure is vibration or impact. Since this determination is made only by internal processing on the circuit, the cause of the failure can be specified without using a shock sensor.

According to a fifteenth aspect of the present invention, when a fault occurs, the reference temperature previously recorded in the memory is compared with a measured temperature measured at the time of the fault, and the measured temperature 17. The magnetic disk drive according to claim 16, further comprising: a temperature rise determining unit that determines that the cause of the failure is a temperature rise if the temperature is outside the appropriate range set based on the reference temperature. When a failure occurs, a comparison is made between a reference temperature previously recorded in a memory and a measurement temperature measured at the time of the failure, and if the measured temperature is outside an appropriate range set based on the reference temperature, the magnetic The temperature of the disk device is cooled by a fan to correct the temperature to an appropriate value within the appropriate range. If the correction no longer causes the failure, it is determined that the cause of the failure is temperature rise. It is characterized by having a temperature rise determination unit for.

Therefore, when a failure occurs, the temperature rise determining unit determines whether the cause of the failure is a temperature rise.

Further, in the magnetic disk drive according to the present invention, when a failure occurs, the reference voltage previously recorded in the memory is compared with a measured voltage measured at the time of the failure, and the measured voltage is 19. A magnetic disk drive according to claim 18, further comprising a voltage abnormality determination unit that determines that the cause of the failure is a voltage abnormality if the voltage is outside an appropriate range set based on a reference voltage. When a failure occurs, the reference voltage pre-recorded in the memory is compared with the measurement voltage measured at the time of the failure, and if the measured voltage is outside the proper range set based on the reference voltage, the magnetic disk A voltage abnormality determining unit that corrects the voltage of the device to an appropriate value within the appropriate range and determines that the cause of the failure is an abnormal voltage when the correction no longer causes the failure. It is characterized in Rukoto.

Therefore, when a failure occurs, the voltage abnormality determining unit determines whether the cause of the failure is a voltage abnormality.

A magnetic disk drive according to a nineteenth aspect of the present invention is a magnetic disk drive, wherein the magnetic disk drive does not receive at least one access command from a higher-level device, and detects a fault that has occurred; After the occurrence of the failure is detected, the reference runout amount recorded in the memory in advance during normal operation is compared with the measurement runout amount measured at the time of the failure occurrence, and the measured runout amount is set based on the reference runout amount. If it is out of the range, a vibration / impact determination unit that determines that the cause of the failure is vibration or shock, and a report unit that reports the cause to the host device after determining the cause of the failure, I have. Further, the magnetic disk drive according to the twentieth aspect of the present invention is a magnetic disk drive, wherein the magnetic disk drive does not receive at least one access command from a higher-level device, a failure detection unit that detects that a failure has occurred, Is detected, the normal runout amount is compared with the reference runout amount previously recorded in the memory and the measured runout amount measured at the time of failure occurrence, and the measured runout amount is out of the proper range set based on the reference runout amount. If so, the run-out amount of the magnetic disk drive is corrected to an appropriate value within the appropriate range and the magnetic disk drive is operated. If the correction no longer causes the failure, it is determined that the cause of the failure is vibration or impact. It is characterized by having a vibration / shock determining unit and a reporting unit that reports the cause to the host device after determining the cause of the failure.

Therefore, when a failure occurs, the failure detection unit detects the failure. Then, the vibration / impact determination unit determines whether the cause of the failure is vibration or impact, and the report unit reports the result of the determination to the host device.

Further, in the magnetic disk drive according to the present invention, after the occurrence of the fault is detected, the reference temperature previously recorded in the memory is compared with a measured temperature measured at the time of the occurrence of the fault, and 23. The magnetic storage device according to claim 22, further comprising a temperature rise determination unit that determines that the cause of the failure is a temperature rise if the temperature is outside an appropriate range set based on the reference temperature. After the occurrence of the failure is detected, the disk device compares the reference temperature recorded in advance in memory with the measurement temperature measured at the time of the failure, and determines that the measured temperature is out of the proper range set based on the reference temperature. Then, the magnetic disk device is cooled by a fan and the temperature is corrected to an appropriate value within the appropriate range. If the correction no longer causes the failure, the cause of the failure is corrected. Is characterized by having a temperature rise determination unit determines that the temperature rise.

Therefore, after the occurrence of a failure is detected by the failure detection unit, the temperature rise determination unit determines whether the cause of the failure is a temperature rise.

Also, in the magnetic disk drive according to the present invention, after the occurrence of the fault is detected, the reference voltage previously recorded in the memory is compared with a measured voltage measured at the time of the fault, and 25. The magnetic recording apparatus according to claim 24, further comprising a voltage abnormality determining unit that determines that the cause of the failure is a voltage abnormality if the voltage is outside an appropriate range set based on the reference voltage. After the occurrence of the failure is detected, the disk device compares the reference voltage recorded in the memory in advance with the measurement voltage measured at the time of the failure, and determines that the measured voltage is out of the proper range set based on the reference voltage. In this case, the voltage of the magnetic disk drive is corrected to an appropriate value within the appropriate range. If the correction no longer causes the failure, it is determined that the cause of the failure is abnormal voltage. It is characterized by having abnormal voltage determining portion.

Therefore, after the occurrence of a failure is detected by the failure detection unit, the voltage abnormality determination unit determines whether the cause of the failure is a voltage abnormality.

[0037]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a magnetic disk drive failure analysis method and a magnetic disk drive failure report method according to the present invention; A specific description will be given based on this.

FIG. 3 shows an embodiment of the magnetic disk drive 10 of the present invention. The magnetic disk device 10 includes a vibration / impact determination unit 12 that determines whether a failure has occurred due to vibration or impact when a failure occurs. The magnetic disk device 10 includes a failure detection unit that detects that a failure has occurred in the magnetic disk device 10, a temperature rise determination unit 14 that determines whether the cause of the failure is a temperature rise, and a failure detection unit 14. And a report unit for reporting the cause of the above to the host device.
Among them, the failure detection unit and the report unit are configured by the controller 16 and are connected to the vibration / impact determination unit 12 and the temperature rise determination unit 14.

A power supply 18 is connected to the magnetic disk device 10, and a host system 20 as a higher-level device is connected to the controller 16 of the magnetic disk device 10. Further, a fan 22 for cooling the magnetic disk device 10 is installed, and is controlled by the host system 20. Here, it is assumed that the host system 20 is composed of a computer having a CPU, a RAM or a ROM serving as a recording device, and an I / O serving as an input / output device. However,
The host system 20 is not limited to a computer, but may be an electric circuit such as a sequence circuit.

The failure detection unit of the magnetic disk device 10 is configured to detect that the magnetic disk device 10
It detects that a failure has occurred when it does not accept the access command twice. The access command is, for example, a Write command / Read command. Here, the number of times of detecting that the access command is not accepted can be set to, for example, once or a plurality of times. If the setting is made a plurality of times, when the host system 20 executes a retry of transmitting an instruction again when the magnetic disk device 10 cannot be accessed,
If an access command is received by the retry, no failure is detected, so that the operation of the magnetic disk device 10 can be continued without interruption.

The vibration / impact judging section 12 comprises an MPU 24 and a memory 26
After the occurrence of a failure is detected, the reference runout amount recorded in the memory 26 in advance during normal operation such as inspection is compared with the measured runout amount measured at the time of the failure, and the measurement is performed. If the runout amount is out of the appropriate range set based on the reference runout amount, the magnetic disk drive
When the runout amount of 10 is corrected to an appropriate value within an appropriate range and the operation is performed, and the correction does not cause a failure, it is determined that the cause of the failure is vibration or impact.

The temperature rise judging section 14 is provided with the MPU 24
After the occurrence of a failure is detected, the reference temperature previously recorded in the memory 26 is compared with the measured temperature measured at the time of the failure, and the measurement is performed. If the temperature is outside the proper range set based on the reference temperature, the magnetic disk device 10 is cooled by the fan 22 and the temperature is corrected to a proper value within the proper range, and the correction does not cause a failure. Judge that the cause of the failure is temperature rise.

On the other hand, this failure analysis method in the magnetic disk device 10 is to determine the cause of the failure when a failure occurs in the magnetic disk device 10, and is recorded in the memory 26 in advance during normal operation. The reference runout amount is compared with the measured runout amount measured at the time of the occurrence of the fault.If the measured runout amount is outside the appropriate range set based on the reference runout amount, the runout amount of the magnetic disk drive 10 is adjusted within the appropriate range. The method has a vibration / impact determination step of determining that the cause of the failure is a vibration or a shock when the failure is no longer caused by this correction. The vibration impact determination step is executed by the vibration impact determination unit 12.

The failure analysis method in the magnetic disk device 10 compares a reference temperature recorded in the memory 26 in advance with a measurement temperature measured at the time of occurrence of the failure, and determines the measured temperature based on the reference temperature. If the temperature is outside the set appropriate range, the magnetic disk device 10 is cooled by the fan 22 to correct the temperature to an appropriate value within the appropriate range. Is included in the temperature rise determining step. The temperature rise determination step is executed by the temperature rise determination unit 14.

Further, the fault reporting method for the magnetic disk device 10 is to determine the cause of the fault when the fault occurs in the magnetic disk device 10 and report it to the host device.
A failure detecting step of detecting that a failure has occurred when the magnetic disk device 10 does not receive at least one access command from a higher-level device; a vibration / impact determination step and a temperature rise determination step described above; And reporting the cause to the host device after the determination. Among them, the failure detection step is performed by the failure detection unit, and the reporting step is performed by the reporting unit.

FIG. 1 shows the operation of the magnetic disk drive 10 described above.
And the flowchart shown in FIG.

First, the fault detecting step is executed by the fault detecting unit as follows (steps 101 to 106). The host system 20 transmits a write command / read command access command to the magnetic disk device 10 (step 10).
1). The magnetic disk device 10 executes an operation according to the received access command. Then, the magnetic disk device 10 reports the execution result to the host system 20 at any time regardless of whether the result is normal or abnormal. For example, if the termination is normal, Command Complete is reported as an execution result, and if abnormal, Check Condition is reported as an execution result. As a result of this report, if the access command has been executed normally (step 102 / Yes), the magnetic disk device 10 is determined to be normal (step 103) and waits until the next access command is sent.

When the magnetic disk device 10 does not normally receive the access command (step 102 / N
o), the host system 20 transmits a similar access command to the magnetic disk device 10 again (retry operation) (step 104). As a result of the retry operation, if the access command has been executed normally (step 105 / Yes), the magnetic disk device 10 is determined to be normal although there are signs of failure (step 103), and the next access command is executed. Wait until sent.

On the other hand, if the access command from the host system 20 is not normally received even after retrying the magnetic disk device 10 a preset number of times (for example, 32 times) (step 105 / No), Disk unit 10
Reports a failure to the host system 20 (Check Condition)
Is performed (step 106).

Next, the vibration / impact determination step is performed by a vibration / impact determination section.
12 is executed as follows (steps 107 to 11)
7). Upon receiving the failure report, the host system 20 transmits a control signal to the controller 16 of the magnetic disk device 10. The controller 16 transmits a runout measurement signal to the MPU 24. The MPU 24 measures the runout amount of the relevant track for which no access command has been received, and stores the measured value in the memory 26
Is compared with the run-out amount specific to the magnetic disk device 10 recorded in the step (step 107).

As a result of the comparison, if the measured run-out amount is within the allowable range (for example, ± 5% of the reference run-out amount) (step 108 / Yes), the magnetic disk device 10 executes the reporting process and executes It is not due to shock or vibration "(step 109). If the measured run-out amount is out of the allowable range (step 108 / N
o), the magnetic disk device 10 executes a reporting process to report to the host system 20 that a positioning error (Seek Error) has occurred. Then, the host system 20 transmits a control signal to the controller 16 of the magnetic disk device 10. The controller 16 sends a control signal to the MPU 24.
The MPU 24 corrects the runout amount of the magnetic disk drive 10 (Step 110). If the runout amount is not corrected to an appropriate value (for example, within ± 3% of the reference runout amount) (step 111 / No), the runout amount is corrected again (step 110).

After the runout amount is corrected to an appropriate value (step 111 / Yes), the host system 20 transmits an access command to the magnetic disk device 10 (step 112).
). If the magnetic disk device 10 executes the access command from the host system 20 and ends normally after the correction of the runout amount (step 113 / Yes), the magnetic disk device
10 executes the reporting process and reports to the host system 20 that "the failure factor is due to shock or vibration" (step
114). Based on this result, the investigation of the cause of the failure is based on the individual failure of the magnetic disk device 10, vibration from the system housing,
It can be determined that it suffices to focus on external impacts and the like.

When the magnetic disk device 10 does not normally receive the access command (step 113 / N
o), the host system 20 performs a retry operation on the magnetic disk device 10 (step 115). As a result of the retry operation, if the access command has been executed normally (step 116 / Yes), the magnetic disk device 10 executes a reporting process and states that "the failure factor is due to shock or vibration". (Step 114). On the other hand, when the access command from the host system 20 is not normally received even after the magnetic disk device 10 has retried the preset number of times (step 116 / N).
o), the magnetic disk device 10 executes a reporting process and reports to the host system 20 that "the failure factor is not due to vibration or impact" (step 117).

Further, the temperature rise determining step is executed by the temperature rise determining unit 14 as follows (steps 118 to 2).
09). That is, if it is determined in step 117 or 109 that “the failure factor is not due to vibration or shock”, the host system 20
The control signal is transmitted to the controller 16 of 10. The controller 16 sends a control signal to the temperature sensor 28. Temperature sensor
28 measures the temperature of the magnetic disk drive 10. And M
The PU 24 compares the measured value with a unique reference temperature value (for example, 62 ° C.) of the magnetic disk device 10 recorded in the memory 26 (Step 118).

As a result of the comparison, if the measured temperature is lower than the reference temperature (step 201 / Yes), the magnetic disk device 10 executes a reporting process and reports to the host system 20 that "the failure is not due to a rise in temperature". (Step 202).
If the measured temperature is higher than the reference temperature (step 201)
/ No), the magnetic disk device 10 executes a reporting process to report that a temperature failure has occurred in the host system 20. Then, the host system 20 transmits a control signal to the fan 22. The fan 22 corrects the temperature of the magnetic disk device 10 (Step 203). If the temperature is not corrected to an appropriate value (step 204 / No), the temperature is further corrected (step 203).

After the temperature is corrected to an appropriate value (step
204 / Yes), the host system 20
(Step 205). If the magnetic disk device 10 executes an access command from the host system 20 and ends normally after the temperature correction (step
206 / Yes), the magnetic disk device 10 executes the reporting process and reports to the host system 20 that "the failure factor is due to a rise in temperature" (step 207). With this result,
It can be determined that the investigation of the failure factor should be performed by focusing on the failure of the ICs, the thermal off-track, and the like.

When the magnetic disk device 10 does not normally receive the access command (step 206 / N).
o), the host system 20 performs a retry operation on the magnetic disk device 10 (step 208). As a result of the retry operation, if the access command has been executed normally (step 209 / Yes), the magnetic disk device 10 executes the reporting process and informs the host system 20 that "the failure is due to a rise in temperature". A report is made (step 207). On the other hand, if the access command from the host system 20 is not normally received even after the magnetic disk device 10 has retried the preset number of times (step 209 / N).
o), the magnetic disk drive 10 executes the reporting process and states that the failure is not due to a rise in temperature.
Report to 20. From this result, it can be determined that the investigation of the failure factor should be performed by focusing on factors other than vibration, impact, and temperature rise.

As described above, according to the magnetic disk drive 10 of this embodiment, when a failure occurs, the vibration / impact determination unit
A vibration / impact determination process is performed according to step 12 to determine whether the cause of the failure is vibration or impact.Since this determination is performed only by internal processing on the circuit, the failure can be determined without using a shock sensor. Factors can be identified. Therefore, the circuit configuration can be simplified compared to the conventional magnetic disk drive using a shock sensor while the cause of the failure can be specified, and the number of parts can be reduced to suppress an increase in cost and an increase in the size of the drive. it can.

Further, according to the magnetic disk device 10 of the present embodiment, since the vibration / impact judging unit 12 and the temperature rise judging unit 14 are provided, the cause of the failure is vibration or impact or the temperature rise. Can be determined. For this reason, it is possible to clarify the cause of the failure and to realize early improvement of the failure.

Further, the magnetic disk drive 10 of the present embodiment
According to the report department is executing the reporting process,
The cause of the failure is reported to the host device. For this reason, the host device can promptly notify the user of the cause of the failure, and the user can take prompt measures for the failure.

The embodiment described here is a preferred embodiment of the present invention, and the present invention is not limited to this, and it is needless to say that various modifications can be made without departing from the scope of the invention. . For example, in the above-described embodiment, the vibration impact determination unit 12 and the temperature rise determination unit 14 are provided to execute the failure analysis method of the magnetic disk device 10. However, at least the vibration impact determination unit 12 may be provided. .
That is, if the vibration / impact determination unit 12 performs the vibration / impact determination step, it is possible to specify whether the cause of the failure is vibration or impact without using a shock sensor, thereby simplifying the circuit configuration and reducing the number of parts. Therefore, it is possible to suppress an increase in cost and an increase in the size of the apparatus.

In the above-described embodiment, the temperature rise judging unit 14 is provided in addition to the vibration / impact judging unit 12 in order to execute the failure analysis method for the magnetic disk device 10. However, the present invention is not limited to this. For example, a voltage abnormality determination unit 30 may be provided instead of the determination unit 14. Here, the voltage abnormality determination unit 30 determines whether the cause of the failure is a voltage abnormality based on a result of comparing the reference voltage recorded in the memory 26 in advance with the measured voltage measured at the time of occurrence of the failure. Is what you do. Alternatively, a temperature rise judging unit 14 and a voltage abnormality judging unit 30 may be provided in addition to the vibration impact judging unit 12.
In this case, it is possible to determine whether the cause of the failure of the magnetic disk device 10 is vibration, shock, temperature rise, or abnormal voltage, so that the cause of the failure can be further clarified.

FIG. 4 shows an embodiment of the magnetic disk drive 10 provided with the vibration / impact judging unit 12 and the voltage abnormality judging unit 30. The magnetic disk device 10 replaces the temperature rise determination unit 14 of the magnetic disk device 10 shown in FIG. 3 with a voltage abnormality determination unit 30 and performs a temperature rise determination process performed by the magnetic disk device 10 shown in FIG. This is replaced with a voltage abnormality determination step. This voltage abnormality determination step includes the MPU 24, the memory 26, and the voltage sensor 32. After the occurrence of the failure is detected, the reference voltage previously recorded in the memory 26 and the measured voltage measured at the time of the failure If the measured voltage is out of the proper range set based on the reference voltage, the voltage of the magnetic disk device 10 is corrected to a proper value within the proper range, and no fault is caused by this correction. Is to judge that the cause of the failure is an abnormal voltage. This voltage abnormality determination step is performed by the voltage abnormality determination unit 30. The configuration of the magnetic disk device 10 other than the voltage abnormality determination unit 30 is the same as that of the magnetic disk device 10 shown in FIG.

The operation of the magnetic disk device 10 will be described with reference to the flowcharts shown in FIGS. here,
Steps 501 to 517 of this flowchart are the same as steps 101 to 117 of the flowcharts shown in FIGS.

When the vibration / impact determination process is completed (step
517), a voltage abnormality determination step is performed by the voltage abnormality determination unit 30 as follows (steps 518 to 609). That is, when it is determined in step 517 or step 509 that “the failure factor is not due to vibration or impact”, the host system 20 transmits a control signal to the controller 16 of the magnetic disk device 10. The controller 16 sends a control signal to the voltage sensor 32. The voltage sensor 32 measures the voltage of the magnetic disk device 10. Then, the MPU 24 reads the measured value and the magnetic disk device 10 recorded in the memory 26.
Is compared with the reference voltage value (step 518).

As a result of the comparison, if the measured voltage is within the proper range set based on the reference voltage (step 601 / Yes),
The magnetic disk device 10 executes a reporting process and reports to the host system 20 that "the cause of the failure is not due to an increase in voltage" (step 602). If the measured voltage is outside the proper range (No in step 601 /), the magnetic disk device 10 executes a reporting process to report to the host system 20 that a voltage failure has occurred. And the host system 20
Transmits a control signal to the power supply 18. The power supply 18 corrects the voltage of the magnetic disk device 10 (Step 603). If the voltage is not corrected to an appropriate value (step 604 / No), the voltage is further corrected (step 603).

After the voltage is corrected to an appropriate value (step
604 / Yes), the host system 20
(Step 605). If the magnetic disk device 10 executes the access command from the host system 20 after the voltage correction and ends normally,
606 / Yes), the magnetic disk device 10 executes the reporting process and reports to the host system 20 that "the failure factor is due to an increase in voltage" (step 607). With this result,
It can be determined that the investigation of the cause of the failure should be performed by focusing on the contact failure between the power supply 18 and the magnetic disk device 10 and the failure of the ICs.

If the magnetic disk device 10 has not normally accepted the access command (step 606 / N).
o), the host system 20 performs a retry operation on the magnetic disk device 10 (step 608). As a result of the retry operation, if the access command has been executed normally (step 609 / Yes), the magnetic disk device 10 executes the reporting process and informs the host system 20 that "the failure is due to a voltage increase". Report (step 607). On the other hand, if the access command from the host system 20 is not normally received even after retrying the magnetic disk device 10 a preset number of times (step 609 / N).
o), the magnetic disk drive 10 executes the reporting process and states that the failure is not due to a voltage increase
Report to 20. From this result, it can be determined that the investigation of the failure factor should be performed by focusing on factors other than vibration, shock, and voltage abnormality.

According to the magnetic disk drive 10 of this embodiment, the cause of the failure can be specified without using a shock sensor. Therefore, the conventional magnetic disk drive using the shock sensor can be specified while the cause of the failure can be specified.
In addition to simplifying the circuit configuration as compared with 10, it is possible to reduce the number of parts and suppress an increase in cost and an increase in the size of the device.

On the other hand, in each of the above-described embodiments, if the measured runout amount is out of the appropriate range set based on the reference runout amount, the runout amount of the magnetic disk drive 10 is adjusted to be within the appropriate range. When the fault is no longer caused by this correction, it is determined that the cause of the fault is vibration or impact.However, the measured runout amount is not limited to this, and the measured runout amount is determined based on the reference runout amount. If it is outside the set appropriate range, the cause of the failure may be determined to be vibration or impact. in this case,
Since the operation of correcting the runout amount to an appropriate value becomes unnecessary, the cause of the failure can be more quickly identified.

Similarly, in the embodiment shown in FIGS. 1 to 3 described above, if the measured temperature is outside the appropriate range set based on the reference temperature, the magnetic disk device 10 is After cooling, the temperature is corrected to an appropriate value within the appropriate range, and if this correction no longer causes a failure, it is determined that the cause of the failure is temperature rise.However, the measurement temperature is not limited to this. If the temperature is outside the appropriate range set based on the reference temperature, the cause of the failure may be determined to be a temperature rise. In this case, since there is no need to lower the temperature by operating the fan 22, it is possible to more quickly identify the cause of the failure.

Further, in the embodiment shown in FIGS. 4 to 6 described above, if the measured voltage is out of the appropriate range set based on the reference voltage, the voltage of the magnetic disk device 10 is adjusted by the voltage abnormality judging unit 30 to the appropriate range. Is corrected to an appropriate value within, and if this correction no longer causes a failure, it is determined that the cause of the failure is abnormal voltage, but the measurement voltage is not limited to this and is set based on the reference voltage. If it is out of the appropriate range, the cause of the failure may be determined to be an abnormal voltage. In this case, since there is no need to adjust the voltage, the cause of the failure can be specified more quickly.

In each of the above-described embodiments, the reference value, the appropriate range, and the like are set in the memory 26 in advance. However, specific numerical values, such as the reference value and the appropriate range, are set as appropriate according to the actual device. It is possible.

[0074]

As described above, according to the failure analysis method for a magnetic disk drive according to the present invention, the execution of the vibration / impact determination step determines whether the cause of the failure is vibration or impact. Since it can be performed only by processing, the cause of the failure can be specified without using a shock sensor. Therefore, the circuit configuration can be simplified compared to the conventional magnetic disk drive using a shock sensor while the cause of the failure can be specified, and the number of parts can be reduced to suppress an increase in cost and an increase in the size of the drive. it can.

According to the magnetic disk drive failure analysis method according to the second aspect of the present invention, the runout amount is corrected to an appropriate value, and after confirming that the magnetic disk drive operates normally, the cause of the failure is determined. Since it is specified, specific accuracy can be improved.

According to the magnetic disk drive failure analysis method of the third aspect of the present invention, since the temperature rise determination step is provided in addition to the vibration / impact determination step, whether the cause of the failure is vibration or impact. Or a temperature rise. For this reason, it is possible to clarify the cause of the failure and to realize early improvement of the failure.

According to the magnetic disk drive failure analysis method of the present invention, the cause of the failure is specified after correcting the temperature to an appropriate value and confirming that the magnetic disk drive operates normally. Therefore, specific accuracy can be improved.

According to the magnetic disk drive failure analysis method according to the fifth aspect of the present invention, since the voltage abnormality determination step is provided in addition to the vibration / impact determination step, whether the cause of the failure is vibration or impact. , Or a voltage abnormality, and furthermore, a temperature rise.
For this reason, it is possible to clarify the cause of the failure and to realize early improvement of the failure.

According to the magnetic disk drive failure analysis method of the present invention, the cause of the failure is specified after correcting the voltage to an appropriate value and confirming that the magnetic disk drive operates normally. Therefore, specific accuracy can be improved.

On the other hand, according to the magnetic disk drive fault reporting method of the present invention, the occurrence of the fault is detected by executing the fault detecting step, and the cause of the fault is detected by executing the vibration / impact determination step. Is determined as to whether it is vibration or impact, and the result of the determination is reported to the host device by executing the reporting process. For this reason, the host device can immediately notify the user or the like of the cause of the failure, so that the user or the like can take prompt measures for the failure.

According to the magnetic disk drive fault reporting method according to the ninth or tenth aspect of the present invention, it is possible to determine whether the fault is caused by vibration or impact, or by a rise in temperature. . For this reason, it is possible to clarify the cause of the failure and to realize early improvement of the failure.

According to the magnetic disk drive fault reporting method according to the eleventh or twelfth aspect of the present invention, whether the cause of the fault is vibration or shock, abnormal voltage, or temperature rise Can be determined. For this reason, it is possible to clarify the cause of the failure and to realize early improvement of the failure.

On the other hand, according to the magnetic disk drive of the thirteenth or fourteenth aspect of the present invention, the execution of the vibration / impact determination unit makes it possible to determine whether the cause of the failure is vibration or impact only by internal processing on the circuit. Since it can be performed, the cause of the failure can be specified without using a shock sensor. Therefore, the circuit configuration can be simplified compared to the conventional magnetic disk drive using a shock sensor while the cause of the failure can be specified, and the number of parts can be reduced to suppress an increase in cost and an increase in the size of the drive. it can.

According to the magnetic disk drive of the present invention, since the temperature rise judging unit is provided in addition to the vibration impact judging unit, whether the cause of the failure is vibration or impact. Or a temperature rise. For this reason, it is possible to clarify the cause of the failure and to realize early improvement of the failure.

According to the magnetic disk drive of the seventeenth or eighteenth aspect of the present invention, since the voltage abnormality judging unit is provided in addition to the vibration / shock judging unit, whether the cause of the failure is vibration or shock. , Or a voltage abnormality, and furthermore, a temperature rise.
For this reason, it is possible to clarify the cause of the failure and to realize early improvement of the failure.

According to the magnetic disk drive of the present invention, the occurrence of a failure is detected by the execution of the failure detection unit, and the cause of the failure is vibration or impact by the execution of the vibration / shock determination unit. It is determined whether or not
The result of the determination is reported to the host device by the execution of the report unit. For this reason, the host device can immediately notify the user or the like of the cause of the failure, so that the user or the like can take prompt measures for the failure.

Further, according to the magnetic disk drive of the present invention, it is possible to determine whether the cause of the failure is vibration or shock or a rise in temperature. For this reason, it is possible to clarify the cause of the failure and to realize early improvement of the failure.

According to the magnetic disk drive of the present invention, it is determined whether the failure is caused by vibration or shock, an abnormal voltage, or a temperature rise. can do.
For this reason, it is possible to clarify the cause of the failure and to realize early improvement of the failure.

[Brief description of the drawings]

FIG. 1 is a partial flowchart illustrating a method for reporting a failure in a magnetic disk drive according to the present invention.

FIG. 2 is a flowchart for explaining a method of reporting a failure of the magnetic disk device of the present invention, which is subsequent to the flowchart of FIG. 1;

FIG. 3 is a block diagram schematically showing a magnetic disk drive according to the present invention and its periphery.

FIG. 4 is a block diagram showing another embodiment of the magnetic disk drive and its surroundings.

FIG. 5 is a partial flowchart for explaining another embodiment of a method for reporting a failure of a magnetic disk device.

FIG. 6 is a flowchart for explaining another embodiment of the failure reporting method of the magnetic disk device, and is a continuation of the flowchart of FIG. 5;

[Explanation of symbols]

 10 Magnetic disk unit 12 Vibration / shock judging unit 14 Temperature rise judging unit 16 Controller (fault detecting unit, reporting unit) 20 Host system (host device) 22 Fan 26 Memory 30 Voltage abnormal judging unit

Claims (24)

[Claims] 1. A failure analysis method for a magnetic disk drive, which determines the cause of the failure when a failure occurs in the magnetic disk drive, comprising: a reference runout amount previously recorded in a memory during normal operation; Compare with the amount,
If the measured run-out amount is out of an appropriate range set based on the reference run-out amount, the method further comprises a vibration / impact determination step of determining that the cause of the failure is vibration or impact. analysis method. 2. A failure analysis method for a magnetic disk drive, which determines the cause of the failure when a failure occurs in the magnetic disk drive, comprising: a reference runout amount previously recorded in a memory during normal operation; Compare with the amount,
If the measured runout amount is out of the proper range set based on the reference runout amount, the magnetic disk drive is operated by correcting the runout amount to a proper value within the proper range, and the correction causes the failure. A failure analysis method for a magnetic disk drive, characterized by comprising a vibration / impact determination step of determining that the cause of the failure is vibration or impact when the failure has occurred. 3. A comparison between a reference temperature recorded in advance in a memory and a measured temperature measured at the time of occurrence of a fault, and if the measured temperature is out of an appropriate range set based on the reference temperature,
3. The failure analysis method for a magnetic disk drive according to claim 1, further comprising a temperature rise determination step of determining that the cause of the failure is a temperature rise. 4. A comparison between a reference temperature recorded in a memory in advance and a measurement temperature measured at the time of occurrence of a failure, and if the measured temperature is out of an appropriate range set based on the reference temperature,
The magnetic disk drive is cooled by a fan to correct the temperature to an appropriate value within the appropriate range. If the correction no longer causes the failure, the failure is determined to be caused by a temperature increase. 3. The method according to claim 1, further comprising a determining step. 5. A method for comparing a reference voltage previously recorded in a memory with a measured voltage measured at the time of occurrence of a fault, and determining that the measured voltage is out of an appropriate range set based on the reference voltage.
5. The failure analysis method for a magnetic disk drive according to claim 1, further comprising a voltage abnormality determination step of determining that the cause of the failure is a voltage abnormality. 6. A comparison between a reference voltage recorded in a memory in advance and a measured voltage measured at the time of occurrence of a failure, and if the measured voltage is out of an appropriate range set based on the reference voltage,
A voltage abnormality determining step of correcting the voltage of the magnetic disk device to a proper value within the proper range, and determining that the cause of the trouble is a voltage abnormality when the correction does not cause the trouble. 5. The failure analysis method for a magnetic disk drive according to claim 1, wherein: 7. A method for reporting a failure of a magnetic disk device when a failure occurs in the magnetic disk device and reporting the cause of the failure to a higher-level device, wherein the magnetic disk device is provided at least once from the higher-level device. A failure detection step of detecting that the failure has occurred when the access command is not received, and a reference runout amount previously recorded in a memory during normal operation after the failure has been detected and a measurement measured at the time of the failure occurrence. Comparing the runout amount with the runout amount, if the measured runout amount is out of the appropriate range set based on the reference runout amount, a vibration impact determination step of determining that the cause of the failure is vibration or impact; And reporting the cause to the higher-level device after determining the cause of the problem. 8. A method of reporting a failure of a magnetic disk device when a failure occurs in the magnetic disk device and reporting the cause of the failure to a higher-level device, wherein the magnetic disk device is provided at least once from the higher-level device. A failure detection step of detecting that the failure has occurred when the access command is not received, and a reference runout amount previously recorded in a memory during normal operation after the failure has been detected and a measurement measured at the time of the failure occurrence. By comparing the runout amount with the runout amount, if the measured runout amount is outside the appropriate range set based on the reference runout amount, the magnetic disk device is operated by correcting the runout amount to an appropriate value within the appropriate range. And a vibration / impact determination step of determining that the cause of the failure is vibration or impact when the failure is no longer caused by this correction. Failure report method for a magnetic disk apparatus characterized by having a reporting step for reporting the cause to the upper apparatus after the determination of factors of the disorder. 9. After the occurrence of the failure is detected, a reference temperature previously recorded in a memory is compared with a measurement temperature measured at the time of the failure, and the measured temperature is set to an appropriate range based on the reference temperature. 9. The method according to claim 7, further comprising a temperature rise determining step of determining that the cause of the failure is a temperature rise if the failure is outside. 10. After the occurrence of the fault is detected, a reference temperature previously recorded in a memory is compared with a measured temperature measured at the time of occurrence of the fault, and the measured temperature is set in an appropriate range set based on the reference temperature. Otherwise, the magnetic disk device is cooled by a fan to correct the temperature to an appropriate value within the appropriate range. If the correction no longer causes the failure, the cause of the failure is a rise in temperature. 8. A temperature rise judging step of judging that the temperature rises.
9. The method for reporting a failure of a magnetic disk drive according to claim 8. 11. After the occurrence of the fault is detected, a reference voltage previously recorded in a memory is compared with a measured voltage measured at the time of the occurrence of the fault, and the measured voltage is set to an appropriate range set based on the reference voltage. 11. The method according to claim 7, further comprising a voltage abnormality determining step of determining that the cause of the failure is a voltage abnormality if it is outside. 12. After the occurrence of the fault is detected, a reference voltage previously recorded in a memory is compared with a measured voltage measured at the time of the fault, and the measured voltage is set to an appropriate range set based on the reference voltage. Otherwise, the voltage of the magnetic disk drive is corrected to an appropriate value within the appropriate range. If the correction does not cause the failure, the cause of the failure is determined to be a voltage abnormality. 11. The method for reporting a failure of a magnetic disk drive according to claim 7, further comprising a step. 13. When a fault occurs, a reference runout amount previously recorded in a memory during normal operation is compared with a measured runout amount measured at the time of the fault occurrence, and the measured runout amount is determined based on the reference runout amount. A magnetic disk drive, comprising: a vibration / impact determination unit that determines that the cause of the failure is vibration or impact if the failure is outside the set appropriate range. 14. When a fault occurs, a reference runout amount recorded in a memory in advance during normal operation is compared with a measured runout amount measured at the time of the fault occurrence, and the measured runout amount is determined based on the reference runout amount. If it is out of the set proper range, the runout amount of the magnetic disk drive is corrected to a proper value within the proper range and the magnetic disk drive is operated.If the correction stops the fault, the cause of the fault is vibration or A magnetic disk drive comprising a vibration / impact determination unit for determining an impact. 15. When a fault occurs, a reference temperature previously recorded in a memory is compared with a measured temperature measured at the time of the fault, and the measured temperature is out of an appropriate range set based on the reference temperature. 15. The magnetic disk drive according to claim 13, further comprising a temperature rise determination unit that determines that the cause of the failure is a temperature rise. 16. When a fault occurs, a reference temperature previously recorded in a memory is compared with a measured temperature measured at the time of the fault, and if the measured temperature is out of an appropriate range set based on the reference temperature. For example, the magnetic disk device is cooled by a fan to correct the temperature to an appropriate value within the appropriate range. If the correction does not cause the failure, it is determined that the cause of the failure is an increase in temperature. 15. The magnetic disk drive according to claim 13, further comprising a temperature rise determining unit. 17. When a fault occurs, a reference voltage previously recorded in a memory is compared with a measured voltage measured at the time of the fault, and if the measured voltage is out of an appropriate range set based on the reference voltage. 17. The magnetic disk drive according to claim 13, further comprising a voltage abnormality determining unit that determines that the cause of the failure is a voltage abnormality. 18. When a fault occurs, a reference voltage previously recorded in a memory is compared with a measured voltage measured at the time of the fault, and if the measured voltage is out of an appropriate range set based on the reference voltage. For example, a voltage abnormality determining unit that corrects the voltage of the magnetic disk device to an appropriate value within the appropriate range and determines that the cause of the error is an abnormal voltage if the error no longer occurs due to the correction. 17. The magnetic disk drive according to claim 13, wherein: 19. A failure detection unit for detecting that a failure has occurred when the magnetic disk device does not receive at least one access command from a higher-level device; The reference runout amount previously recorded in the memory is compared with the measured runout amount measured at the time of the occurrence of the fault, and if the measured runout amount is outside the proper range set based on the reference runout amount, the cause of the fault is vibration. A magnetic disk drive, comprising: a vibration / impact determination unit that determines that the failure is a shock; and a report unit that reports the cause to the host device after determining the cause of the failure. 20. A failure detecting unit for detecting that a failure has occurred when the magnetic disk device does not receive at least one access command from a higher-level device; The runout of the magnetic disk device is compared with a reference runout amount recorded in advance in memory and a measured runout amount measured at the time of occurrence of a fault, and if the measured runout amount is outside an appropriate range set based on the reference runout amount. The operation is performed by correcting the amount to a proper value within the proper range, and when the trouble does not occur due to the correction, a vibration / shock determining unit that determines that the cause of the trouble is vibration or shock; And a reporting unit for reporting the factor to the host device after determining the factor. 21. After the occurrence of the fault is detected, a reference temperature previously recorded in a memory is compared with a measured temperature measured at the time of occurrence of the fault, and the measured temperature is set in an appropriate range based on the reference temperature. 21. The magnetic disk drive according to claim 19, further comprising a temperature rise determination unit that determines that the cause of the failure is a temperature rise if it is outside. 22. After the occurrence of the fault is detected, a reference temperature previously recorded in a memory is compared with a measured temperature measured at the time of the occurrence of the fault, and the measured temperature is set to an appropriate range set based on the reference temperature. Otherwise, the magnetic disk device is cooled by a fan to correct the temperature to an appropriate value within the appropriate range. If the correction no longer causes the failure, the cause of the failure is a rise in temperature. 20. A temperature rise judging unit for judging that the temperature rises.
21. The magnetic disk drive according to claim 20. 23. After the occurrence of the fault is detected, a reference voltage previously recorded in a memory is compared with a measured voltage measured at the time of occurrence of the fault, and the measured voltage is set in an appropriate range set based on the reference voltage. 23. The magnetic disk drive according to claim 19, further comprising a voltage abnormality determination unit that determines that the cause of the failure is a voltage abnormality if it is outside. 24. After the occurrence of the fault is detected, a reference voltage previously recorded in a memory is compared with a measured voltage measured at the time of occurrence of the fault, and the measured voltage is set to an appropriate range set based on the reference voltage. Otherwise, the voltage of the magnetic disk drive is corrected to an appropriate value within the appropriate range. If the correction does not cause the failure, the cause of the failure is determined to be a voltage abnormality. 23. The magnetic disk drive according to claim 19, further comprising a unit.