JP2003296903A - Disk storage device and write control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk storage device for inhibiting alternate processing under a low temperature environment. <P>SOLUTION: When performing a write operation in response to a write instruction, a CPU 10 confirms 'write OK' on the basis of the alignment accuracy of a head 2. When the CPU 10 cannot confirm 'write OK', the CPU 10 performs a write retrial. In this case, the CPU 10 causes a temperature sensor 12 to monitor the temperature of a drive and when the drive is brought into a low temperature state less than a specified temperature, the CPU 10 inhibits the alternate processing. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a disk storage device for magnetically recording data on a disk medium, and more particularly to a method for controlling an alternative process under a low temperature environment.

[0002]

2. Description of the Related Art Generally, a disk storage device such as a magnetic disk device or a magneto-optical disk device (hereinafter sometimes referred to as a disk drive) magnetically records data on a disk which is a recording medium. Further, the magnetic recording data is restored from the disk to the original data.

By the way, the disk drive is widely used not only as a storage device for a conventional personal computer but also as a data storage device for various digital devices mounted on a digital television or an automobile. . For this reason, in the operating environment of the disk drive accompanying the installation of digital equipment, technical measures are required especially for the temperature environment.

Normally, in order to ensure a certain level of reliability, the temperature range in which the disk drive can operate normally is
It is preset as product specifications. In a disk drive, since data is magnetically recorded on the disk, the recording characteristics (write operation characteristics) at low temperatures are important. Generally, in the field of magnetic recording technology, the coercive force of a disk increases as the temperature decreases. For this reason,
It has been confirmed that when the temperature becomes extremely low, the magnetic recording capability of the write head is exceeded and magnetic recording by magnetization reversal on the disk becomes difficult. Therefore, in the temperature range as the product specification, the temperature value of the operation limit on the low temperature side is specified based on the recording characteristics related to the write operation.
In the read operation of reading data from the disc,
The allowable operating range on the low temperature side is wider than the write operation. Further, the temperature value of the operation limit on the high temperature side is determined depending on the read / write operation characteristics as well as the operation characteristics of the components of the disk drive.

[0005]

In the disk drive, temperature specifications relating to the read / write operation are set based on the magnetic recording characteristics especially at low temperatures. In a low temperature environment exceeding the allowable range of temperature specifications, there is a high possibility that sufficient reliability for recorded data cannot be ensured, especially when a write operation for recording data on a disc is executed. Therefore, conventionally, a technique has been developed or proposed in which the temperature inside the drive is monitored by a temperature sensor and a write operation is prohibited when a change in low temperature exceeding an allowable range occurs (for example, Japanese Patent Laid-Open No. 7- 6560 or U.S. Pat. No. 5,461,603). With such a prior art, it is possible to avoid the situation where user data with low reliability is recorded on the disk even when a temperature fluctuation below the low temperature limit occurs.

However, in the disk drive, in addition to the normal write operation, there is a write operation mode in which the host system does not participate (regardless of issuance of a write command). Specifically, alternative processing or reassignment (re-ass
ignment) process. The alternative process is a process of identifying an area on the disc where data cannot be normally recorded and changing the recording area to an alternative area. The alternative process includes a write operation for rewriting the alternative process information, in addition to the normal user data write operation. This alternative processing information is the file allocation recorded at a predetermined position (for example, the outermost track) on the disc.
It corresponds to address management table information such as a table.
Here, the alternative process executed during the write operation may be referred to as a write reassign process, and the alternative process executed during the read operation may be referred to as a read reassign process.

The alternative process is a mode in which the disk drive automatically executes, not an instruction from the host system. That is, unlike the normal read / write operation, the drive automatically executes the alternative process in the situation where the host system is not involved, and the accompanying write process of the alternative process information is executed. For this reason, even if a temperature fluctuation below the low temperature limit occurs, the host system cannot control, and therefore the alternative process is executed in a state where the magnetic recording capacity of the write head is reduced. Therefore, the alternative process information associated with the alternative process is likely to be recorded on the disc in a state where sufficient reliability cannot be ensured. In the worst case, the alternative processing information may be lost.

Therefore, an object of the present invention is to provide a disk storage device which can prohibit a less reliable alternative process in a low temperature environment and avoid a decrease in reliability of alternative process information.

[0009]

SUMMARY OF THE INVENTION An aspect of the present invention relates to a disk storage device having a control function of prohibiting execution of alternative processing under a low temperature environment.

A disk storage device according to an aspect of the present invention comprises a read / write means for performing a data read operation or a data write operation on a disk medium using a head, a temperature sensor for detecting a temperature, and a write. When it is not possible to confirm that a normal write operation is possible at the time of operation execution, the means for executing the alternative processing to change the write target area on the disk medium to the alternative area and the temperature detected by the temperature sensor are the specified values. And a control means for prohibiting the alternative process when the temperature is lower.

With the disk storage device having such a configuration, for example, when the ambient temperature or the internal temperature of the drive is lower than the specified value during the write reassign process,
The reassignment process can be prohibited. Therefore, it is possible to avoid the situation where the low reliability information is recorded on the disc due to the write operation with low reliability at low temperature.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Structure of Disk Drive) FIG. 1 is a block diagram showing a main part of a disk drive according to this embodiment.

This disk drive is a hard disk drive (HD
D) is assumed. This drive has a magnetic head 2 for performing a data read / write operation on a disk 1. Disk 1 is a spindle motor (SP
M) Fixed to 3 and rotated at high speed. Magnetic head 2
Are mounted on an actuator 4 driven by a voice coil motor (VCM) 5. A drive current is supplied to the VCM 5 by a VCM driver 60 included in the motor driver IC 6. The motor driver IC6 is VC
CP including the SPM driver 61 together with the M driver 60
It is controlled by U10.

Here, the magnetic head 2 has a structure in which a read head for performing a read operation and a write head for performing a write operation are mounted on a slider. The actuator 4 is driven and controlled by a servo system having the CPU 10 as a main element to position the magnetic head 2 at a target position on the disk 1.

In addition to such a head / disk assembly, the disk drive includes a preamplifier circuit 7 and an R /
W channel 8 and disk controller (HDC) 9
And a circuit system having a CPU 10 and a memory 11.

The preamplifier circuit 7 has a read amplifier and a write amplifier for amplifying the read signal output from the read head. The write amplifier converts the write data signal output from the R / W channel 8 into a write current signal and sends it to the write head. R / W channel 8
Read / write data signal (including servo data signal)
Is a signal processing IC for processing the.

The HDC 9 is a drive and host system 2
0 (for example, personal computer or digital device)
Has an interface function with. Specifically, HD
The C 9 manages the buffer memory 90 and executes transfer control of read / write data between the disk 1 and the host system 20. The buffer memory 90 is a DRAM that temporarily stores read / write data. HDC9
Uses the buffer memory 90 to realize a write cache function for caching write data and a read cache function for caching read data.

The CPU 10 is a main controller of the drive, and executes control operation of the servo system, normal read / write operation control, and control of alternative processing (reassign processing) related to the present embodiment. The memory 11 is a flash memory (EEPROM) 1 which is a non-volatile memory.
CPU 10 including RAM and ROM in addition to 10.
Save various data and programs required for control of the.

Further, the present drive has a temperature sensor 12 for detecting the temperature inside the drive. Temperature sensor 1
2 detects the temperature at a fixed sampling interval and outputs the temperature value to the CPU 10. The CPU 10 monitors the temperature fluctuation according to the temperature detection from the temperature sensor 12. Here, the temperature detection value of the temperature sensor 12 is represented as “K”, and the low temperature limit value at which the normal read / write operation can be normally executed is represented as the prescribed value T. If the ambient temperature (K) of the drive is the specified value T or higher, the CPU 10 determines that the temperature environment is normal. Normally, the temperature sensor 12 is
It is mounted on the circuit board provided in the disk drive.

The host system 20 may have a unique temperature sensor, monitor changes in the ambient temperature of itself and the drive, and notify the CPU 10 of the detected temperature value K via the HDC 9. Further, the host system 20 can obtain the temperature value K detected by the temperature sensor 12 from the disk drive by issuing a predetermined command.

(First Embodiment and Alternative Processing) The first embodiment and alternative processing will be described below with reference to the flowchart of FIG. 2 together with FIG.

Here, it is assumed that the disk drive receives a write command from the host system 20. Upon receiving the write command, the CPU 10 positions the head 2 in a designated area on the disk 1 and executes a write operation for writing the data transmitted from the host system 20 (step S1).

During this write operation, the CPU 10 confirms the positioning accuracy of the head 2 with respect to the designated area on the disk 1. When the positioning accuracy is sufficient, the CPU 10 determines that the normal write operation can be executed, and executes the data write (write O).
K, YES in step S2). The positioning accuracy of the head 2 varies depending on the state of servo information recorded in advance on the disk 1 and the influence of disturbance (acceleration) applied to the drive. When the CPU 10 confirms that the normal write operation on the disk 1 is possible, the host system 2 indicates that the write operation has been executed and the normal end has been completed.
0 is notified (YES in step S2).

On the other hand, the CPU 10 repeats the write retry operation within a predetermined number (N) when it cannot confirm the sufficient head positioning accuracy, that is, when it cannot confirm that the normal write operation is possible (step S2). No, S3 to S5). When the write OK is confirmed by this write retry operation, the CPU 10
Notifies the host system 20 that the normal write operation has ended normally (YES in step S4).

On the other hand, even if the number of write retries exceeds the predetermined number, the above condition cannot be ensured and the normal write operation (actually, sufficient head positioning accuracy) cannot be confirmed. Is stopped (YES in step S5).

In this state, the CPU 10 has the temperature sensor 1
It is determined whether the drive temperature (ambient temperature or internal temperature) is lower than the specified value T based on the comparison result of the temperature detection value K from 2 and the specified value T (step S
6). If the drive temperature is normal above the specified value T,
The CPU 10 shifts to the alternative process (YE in step S6).
S, S7).

In the alternative process, the CPU 10 invalidates the designated area (write target area) where the write operation is impossible,
A predetermined alternative area on the disk 1 is set and the designated area is changed. This alternative area is an alternative track in units of tracks, and an alternative sector in units of data sectors. Here, the CPU 10 uses the address management table information (or FAT: FAT:
Execute the process of rewriting (updating) the file allocation table). Through this alternative processing, the CPU 10 executes a write operation for recording data in the alternative area, and notifies the host system 20 of the normal end.

On the other hand, when the CPU 10 confirms that the temperature of the drive is in the low temperature state below the specified value T, it prohibits the alternative process and shifts to a predetermined abnormal process (step S6).
NO). As a predetermined abnormal process, the host system 20 determines that the CPU 10 cannot normally execute the write command.
Including processing to notify.

As described above, according to the method of the first embodiment, if the normal write operation cannot be confirmed based on the positioning accuracy of the head 2, and if the temperature of the drive is within the allowable range, the drive is automatically operated. To perform alternative processing. On the other hand, when the temperature of the drive is a low temperature lower than the specified value T, the alternative process is prohibited.

In the low temperature state, the write capability of the write head is relatively lowered, and the reliability of data recording when the write operation is executed is lowered. Therefore, according to the method of the embodiment, by prohibiting the alternative process, the rewriting operation (write operation) of the alternative process information associated with the alternative process is not executed. Disk 1
It is possible to avoid the situation described above. The host system 20 can confirm that the write operation cannot be performed by the notification from the drive, and thus can reissue the write command.

(Second Embodiment) FIG. 3 is a flow chart for explaining the method of the second embodiment. In the embodiment, when executing a write operation such as a test write,
When the temperature of the drive is lower than the specified value T and normal recording can be confirmed by reading and verifying the data recorded by the write operation, the write operation is normally terminated.

In response to a write command (for example, a test write command) from the host system 20, the CPU 10 executes a write operation for a designated area on the disk 1. At this time, the CPU 10 executes a normal write operation (including a normal alternative process) when the drive temperature is normal at a specified value T or higher, and notifies the host system 20 when the drive is normally completed (step YES in S20, S2
7).

On the other hand, when the drive temperature (detection value K) is in the low temperature state below the specified value T, the CPU 10 determines whether or not the write is OK based on the positioning accuracy of the head 2 (step S21). , S22), if it is determined that the write operation can be executed, data writing is executed (write OK, YES in step S22). Here, if it cannot be determined that the write is OK, the CPU 10 executes control (including prohibition) of the write retry process and the alternative process (NO in step S22, S28, and so on) as in the first embodiment. S30-S33).

On the other hand, when the CPU 10 determines that the writing is OK, it verifies the data recorded by the write operation from the disk 1 to perform a check (YES in step S22, S25). If normal recording can be confirmed by this verification, the CPU 10
Notifies the host system 20 that the write operation has ended normally (YES in step S26). On the other hand, if the normal recording cannot be confirmed, the CPU 10 executes a predetermined abnormal process such as a process of notifying the host system 20 that the write command cannot be normally executed (NO in step S26).

Here, the CPU 10 confirms whether or not the temperature of the drive has risen to the specified value T before executing the verification (step S23). When the temperature has not changed from the low temperature state, the CPU 10 prohibits the read reassign process (NO in step S23, S24). The read reassign process is an alternative process that accompanies the read operation. That is, when a read error occurs during execution of the read operation, the read retry process is repeated a predetermined number of times. By this read retry process, when the read error is not recovered, the read reassign process is automatically executed.

Therefore, in the embodiment, when the temperature of the drive is at a low temperature lower than the specified value T, the read reassign process is prohibited in advance so that the alternative process information associated with the alternative process is displayed. Rewrite operation (write operation) can be prohibited. Therefore, it is possible to avoid a situation in which the alternative processing information having low reliability is recorded on the disk 1.

(Third Embodiment) FIG. 4 is a flow chart for explaining the method of the third embodiment. In this embodiment, the host system 20 uses the temperature sensor 12 mounted on the disk drive or the temperature sensor mounted on the system itself to drive (or system) the drive.
Monitor the ambient temperature of the. Further, in the above-described second embodiment, it is a method of executing the verification for confirming the write operation executed at the low temperature by an instruction from the host system 20.

That is, when issuing the write command, the host system 20 confirms whether or not the ambient temperature of the drive (or system) is in a low temperature state below the specified value T (step S20). In the disk drive, CPU1
0 indicates that the ambient temperature of the drive is the specified value T due to the notification from the drive temperature sensor 12 or the host system 20.
Check whether the temperature is below the low temperature. Then, similarly to the above-described second embodiment, the CPU 10 automatically executes a series of processes (range of reference numeral 400) in response to a write command from the host system 20 (steps S21 to S21).
S24, S27, S28, S30 to S33).

On the other hand, the host system 20 records from the disk 1 by the write operation when the drive confirms the write OK in the write operation when the ambient temperature of the drive is in the low temperature state below the specified value T. Perform verification to read and check data (step S
25). When the normal recording can be confirmed by the verification, the host system 20 confirms from the notification from the CPU 10 that the write operation is normally completed (YES in step S26). On the other hand, when the normal recording cannot be confirmed, the host system 20 confirms from the notification from the CPU 10 that the write operation is not normal but abnormally ends (NO in step S26).

(Fourth Embodiment) FIG. 5 is a flow chart for explaining the method of the fourth embodiment. In this embodiment, the host system 20 uses the temperature sensor 12 mounted on the disk drive or the temperature sensor mounted on the system itself to drive (or system) the drive.
The ambient temperature of is monitored (step S50). Further, when the ambient temperature of the drive is in a low temperature state below the specified value T, the host system 20 issues a command to the disk drive to prohibit the alternative process (step S5).
1). Incidentally. A range indicated by reference numeral 500 in FIG. 5 indicates processing automatically executed by the disk drive.

In response to a write command from the host system 20, the CPU 10 executes a write operation for a designated area on the disk 1. At this time, the CPU 10 executes a normal write operation (including a normal alternative process) when the ambient temperature of the drive is normal at a specified value T or higher, and notifies the host system 20 when the drive is normally completed ( Step S50: YES, S56).

On the other hand, when the ambient temperature of the drive (detected value K) is in the low temperature state below the specified value T, the CPU 10 receives a write command and an instruction to prohibit the alternative process (steps S51 and S52). . Based on the positioning accuracy of the head 2, the CPU 10 confirms whether or not the write is OK indicating a normal write operation (step S53). Here, when the write OK cannot be confirmed, the CPU 10 executes the write retry process a predetermined number of times (N) (NO in step S53, S57 to S57).
59). However, because we have received an instruction to prohibit alternative processing,
When the write retry process has been executed a predetermined number of times (N), the CPU 10 proceeds to a predetermined abnormal process without executing the alternative process (YES in step S59).

When confirming the write OK, the CPU 10 shifts to the verify process by the command from the host system 20 as in the third embodiment (YES in step S53, S61, S62). . In addition,
The CPU 10 performs the read reassignment prohibition process.
Automatically executes (NO in step S54, S5
5).

(Fifth Embodiment) FIG. 6 is a flow chart for explaining the method of the fifth embodiment. The same embodiment is a method of stopping the write cache function executed by the HDC 9 using the buffer memory 90 when the temperature of the drive is in a low temperature state below the specified value T.

That is, the CPU 10 responds to a write command (for example, a test write command) from the host system 20.
Performs a write operation on a designated area on the disk 1. At this time, the CPU 10 executes a normal write operation (including a normal alternative process) when the drive temperature is normal at a specified value T or higher, and notifies the host system 20 when the drive is normally completed (step S70 YE
S, S76).

On the other hand, when the drive temperature (detected value K) is lower than the specified value T in the low temperature state, the CPU 10 causes the HDC
9. The write cache function of 9 is stopped (step S70).
No, S71). Then, the CPU 10 confirms the write OK indicating the normal write operation based on the positioning accuracy of the head 2 (steps S72 and S7).
3). Note that steps S74, S75, S77, S7
8, S80 to S84, steps S23 to S26, S28, S30 to S3 in the above-described second embodiment.
Since it is the same as the processing up to 3 (see FIG. 3), description thereof will be omitted.

Here, the HDC 9 of the disk drive is
When the write data is transferred from the host system 20 in order to improve the data transfer speed, it has a write cache function of accumulating the data in the buffer memory 90. In the disk drive having the write cache function, when the read command is issued after the write operation is executed when the temperature is low, the verify process is performed, and the data cached in the buffer memory 90 is stored in the host system 20. Transfer to. Therefore, the data actually recorded on the disc 1 may not be transferred to the host system 20.

Therefore, in the present embodiment, when the write cache function is provided, the write cache function is stopped before the write operation is executed when the drive temperature is low. Alternatively, the CPU 10 may execute a data write operation or a data read operation after clearing (flashing) the data accumulated in the buffer memory 90 via the HDC 9.

In short, according to the method of the embodiment, since the write cache function is stopped especially when the temperature of the drive is low, when the data immediately after being recorded by the write operation is read, the write operation is performed. Instead of the cached data, the data actually recorded on the disk 1 can be transferred to the host system 20. As a result, the host system 20 can confirm the data actually recorded on the disk 1 when the drive temperature is low.

(Sixth Embodiment) FIG. 7 is a flow chart for explaining the method of the sixth embodiment. In the same embodiment, when the ambient temperature of the drive is in a low temperature state below the specified value T, the CPU 10 buffers the write data in the buffer memory 90 and temporarily prohibits the write operation on the disk 1. is there. The details will be described below.

In response to the write command from the host system 20, the CPU 10 starts the write operation for the designated area on the disk 1. At this time, the CPU 10 executes a normal write operation (including a normal alternative process) when the drive temperature is normal at a specified value T or higher, and notifies the host system 20 when the drive is normally completed (step YES in S90, S96).

On the other hand, when the drive temperature is lower than the specified value T, the CPU 10 causes the host system 20
The write data transferred from is temporarily stored in the buffer memory 90, and the write operation (disk write) on the disk 1 is temporarily prohibited (steps S91 to S91).
93).

When the temperature of the drive rises to the specified value T after the lapse of a predetermined time, the CPU 10
The prohibition of the disk write is released, and the data held in the buffer memory 90 is recorded on the disk 1 (YES in step S94, S95). If the temperature of the drive remains low even after a predetermined time has passed, the CPU 1
0 executes a predetermined abnormal process such as a process of notifying the host system 20 that the write command cannot be executed normally (NO in step S94).

As described above, according to the method of the embodiment,
When the temperature of the drive (ambient temperature or internal temperature) is low, the write operation on the disk 1 is temporarily suspended and the write data is buffered until the normal temperature is reached. Therefore, it is possible to avoid a situation in which write data with low reliability is recorded on the disk 1.

Since the temperature of the drive heats up inside the drive when the power is turned on, the temperature can be expected to rise after a certain amount of time has passed. Therefore, by temporarily buffering write data until a predetermined time elapses,
The situation of invalidating the write operation can be relatively avoided.

In each of the embodiments, when the mounting position of the temperature sensor 12 in the drive and the positions of the disk 1 and the head 2 are distant from each other, a temperature difference may occur between them. . In such a case, it is desirable to obtain the correlation between both temperatures in advance and determine the specified value T based on this.

[0058]

As described above in detail, according to the present invention, in a low temperature environment, the reliability of alternative processing information can be prevented from lowering by prohibiting the alternative processing with low reliability. Therefore, as a result, it is possible to provide the disk storage device which can improve the reliability of the recorded data on the disk.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main part of a disk drive according to each embodiment of the present invention.

FIG. 2 is a flowchart related to the first embodiment.

FIG. 3 is a flowchart relating to a second embodiment.

FIG. 4 is a flowchart relating to a third embodiment.

FIG. 5 is a flowchart related to a fourth embodiment.

FIG. 6 is a flowchart relating to a fifth embodiment.

FIG. 7 is a flowchart relating to a sixth embodiment.

[Explanation of symbols]

1 ... Disc 2 ... Magnetic head 3 ... Spindle motor (SPM) 4 ... Actuator 5 ... Voice coil motor (VCM) 6 ... Motor driver IC 7 ... Preamplifier circuit 8 ... R / W channel 9 ... Disk controller (HDC) 10 ... CPU 11 ... Memory 12 ... Temperature sensor 20 ... Host system 90 ... Buffer memory 110 ... Flash memory

Claims (20)

[Claims] 1. A read / write means for performing a data read operation or a write operation on a disk medium using a head, a temperature sensor for detecting a temperature, and a normal write operation when the write operation is executed. When it is determined that the write operation cannot be performed on the disk medium, an alternative process for changing the write target area to the alternative area, and the alternative process when the temperature detected by the temperature sensor is lower than a specified value A disk storage device comprising: 2. The disk storage device according to claim 1, wherein the replacement processing includes a rewriting operation of replacement processing information for changing a write target area on the disk medium to a replacement area. . 3. The disk storage device according to claim 2, wherein the alternative processing information corresponds to address management table information or file allocation table information recorded on the disk medium. 4. The control means determines that a normal write operation cannot be performed when the head cannot be positioned in a write target area on the disk medium during a write operation, and executes a write retry operation a predetermined number of times. 2. The disk storage device according to claim 1, wherein when the temperature detected by the temperature sensor rises to a specified value, execution of the alternative process is controlled. 5. The control means determines that a normal write operation cannot be performed when the head cannot be positioned in a write target area on the disk medium during a write operation, and executes a write retry operation a predetermined number of times. 2. The disk storage device according to claim 1, wherein when the temperature detected by the temperature sensor is lower than a specified value, the alternative process is prohibited and a predetermined error process is executed. 6. The control means, when the temperature detected by the temperature sensor is lower than a specified value when a write operation is executed in a designated area on the disk medium in response to a write command from the outside. The data recorded by the write operation is read from the designated area and verified, and if the verification confirms that the recording is normal, the operation ends normally, and if the recording cannot be verified, a predetermined error process is executed. The disk storage device according to claim 1, wherein the disk storage device is controlled as follows. 7. The control means executes a write operation in a designated area on the disk medium in response to a write instruction from the outside, and records by a write operation from the designated area in response to a read instruction from the outside. When reading the read data, when the temperature detected by the temperature sensor is lower than a specified value, control is performed so as to prohibit the alternative process associated with the read retry operation. The disk storage device described. 8. A disk storage device that uses a head to perform a data read / write operation in response to a read / write command from a host system having a temperature detection function for detecting a temperature. In the case where it is determined that the normal write operation cannot be performed at the time of executing the write operation, the means for executing the alternative process of changing the write target area on the disk medium to the alternative area, and the temperature specified by the host system. A disk storage device comprising: a control unit that prohibits the alternative process when notified that the temperature is lower than a value. 9. The control means executes a write operation in a designated area on the disk medium in response to a write command from the host system, and when the temperature is lower than a specified value, a command from the host system. According to the above, the data recorded by the write operation is read from the designated area and verified, and if the verification confirms that the recording is normal, the operation ends normally, and if the recording cannot be verified, a predetermined error processing is performed. 9. The disk storage device according to claim 8, wherein the disk storage device is controlled to execute. 10. The disk according to claim 8, wherein the control means controls so as to prohibit the alternative processing in response to an instruction from the host system when the temperature is lower than a specified value. Storage device. 11. The control means prohibits the alternative process and cannot position the head in a write target area on the disk medium when executing a write operation in response to a write command from the host system. Sometimes, it is determined that the normal write operation cannot be performed, and the write retry operation is executed a predetermined number of times. When the normal write operation cannot be performed after the write retry operation of the predetermined number of times is completed, a predetermined error process is executed. 9. The disk storage device according to claim 8, which is controlled. 12. The control unit controls to stop the write cache function or clear the write buffer when the temperature detected by the temperature sensor is lower than a specified value. To claim 7
The disk storage device according to claim 1. 13. The control means controls to stop the write cache function or clear the write buffer in response to a notification or an instruction from the host system when the temperature is lower than a specified value. Claim 8
The disk storage device according to claim 11. 14. A read / write means for executing a data read operation or a write operation on a disk medium using a head, a temperature sensor for detecting a temperature, and a write data temporary during the write operation. When the temperature detected by the temperature sensor is lower than a specified value, the write operation for the disk medium is performed while holding the write data in the buffer memory during the write operation. A disk storage device comprising: a prohibition control unit. 15. The control means releases the write prohibition to the disk medium when the temperature detected by the temperature sensor rises to a specified value, and the data stored in the buffer memory is transferred to the disk medium. 15. The disk storage device according to claim 14, wherein the disk storage device is controlled to write to the disk. 16. A write control method applied to a disk storage device for recording data on a disk medium using a head, comprising: detecting a temperature; and performing a ride operation on the disk medium. Based on the positioning accuracy when the head is positioned in the write target area, a step of confirming whether or not a normal write operation is possible, and a step of confirming that the normal write operation is not possible cannot be confirmed. Sometimes, it comprises a step of executing an alternative process of changing the write target area on the disk medium to an alternative area, and a step of prohibiting the alternative process when the temperature is lower than a specified value by the detecting step. A light control method configured. 17. A step of executing a write retry operation a predetermined number of times when it is not possible to confirm that a normal write operation is possible in the confirming step, and the alternative process when the temperature rises to a specified value. 17. The light control method according to claim 16, further comprising the step of permitting execution of. 18. When performing a write operation to a designated area on the disk medium in response to a write command from the outside, and when the temperature detected by the detection step is lower than a specified value, write from the designated area. The step of reading and verifying the data recorded by the operation; if the verification step confirms that the recording is normal, the operation ends normally; if the recording normality cannot be confirmed, a predetermined error process is executed. The light control method according to claim 16, further comprising a step. 19. The light control method according to claim 16, wherein the prohibiting step prohibits the alternative process in response to an external command when the temperature is lower than a specified value. 20. The write control method according to claim 16, further comprising the step of stopping the write cache function or clearing the write buffer when the temperature is lower than a specified value by the detecting step.