JPH11353784A - Retry control method for magnetic disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress erroneous write-in into a medium and to reduce redundant write-in operation from an error occurrence position to its detection by sensing a shock caused by a write-in error with a shock sensor and interrupting a write-in current into a head. SOLUTION: When a magnetic disk device receives the shock of an extent causing an error, a shock sensor 33 outputs shock error-cum-write strap signal 80, and then, a read/write controller 31 interrupts a head write-in current to a magnetic disk 40 to suppress data erroneous write-in into the magnetic disk 40 and to reduce redundant write-in operation from an error occurrence position to its detection. Further, a drive control processor 34 detects the error by the signal 80 and informs a controller control processor 24 of the error through a disk interface 60. Thus, the processor 24 makes it possible to execute retry operation without the redundant write-in operation from the error occurrence position to its detection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a retry control method for a storage device, and more particularly to a control method effective for improving the performance and reliability of a magnetic disk device in an IDless system.

[0002]

2. Description of the Related Art In a conventional magnetic disk drive, a write error is detected for each servo, particularly in an IDless system,
The retry method was used. In this method, since a write error generated by an impact cannot be detected until the next servo, data is written from an error occurrence position to the next servo.

[0003]

In the prior art, data is written from a write error location caused by an impact to the detection of an error, so that data is written in a location other than the original write location. For this reason, there is a problem that the already written data is destroyed or the data is left unwritten. In addition, in the ID-less system, a write error caused by an impact cannot be detected until the next servo, so that the data write operation during this period becomes a redundant operation until the start of retry, so that the performance of retry processing time is deteriorated. there were.

An object of the present invention is to improve the reliability of a magnetic disk drive by detecting a write error caused by an impact based on the degree of the impact, thereby preventing erroneous writing.

It is another object of the present invention to suppress an increase in retry processing time due to a reduction in redundant write operations from a write error occurrence point caused by an impact to an error detection in an IDless system. .

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording medium in which data is erroneously written to a medium by interrupting a write current to a head by a shock sensor or the like for sensing a shock when a shock causing a write error is applied. Inhibition of writing and reduction of redundant writing operations performed between the point where an error occurs and the time of detection are achieved. In addition, the drive control processor detects an error from the sensor, reports the error to the controller control processor, and performs a retry of the write operation, thereby reducing the retry processing time.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to embodiments shown in the accompanying drawings. FIG. 1 is a block diagram showing an embodiment of a magnetic disk control device to which the present invention is applied.

In FIG. 1, reference numeral 10 denotes a host computer, and reference numeral 20 denotes a controller control unit. The host computer 10 and the controller control unit 20 are connected via a host interface 50. The controller control device and the drive control device are connected via a disk interface, reference numeral 40 denotes a magnetic disk, and the drive control device 30 is connected to the drive interface 7.
0 is connected.

The controller controller 20 includes an interface controller 21 for controlling data transfer with the host computer 10, a hard disk controller 22 for controlling data transfer with the magnetic disk 40, and the like.
Further, a buffer controller (buffer) 23 that absorbs the difference between the data transfer speeds and controls the data transfer inside the control device 20 and a controller control processor 24 that controls them are configured.

The drive control device 30 comprises a read / write controller 31, a servo controller 32, a shock sensor 33 for detecting a shock, and a drive control processor 34 for controlling the shock sensor 33.

When the impact applied to the magnetic disk drive in the above configuration is an impact that causes an error, the shock sensor 33 outputs an impact error / write stop signal 80. With this signal, the read / write controller 31 cuts off the write current to the head with respect to the magnetic disk 40, thereby preventing the erroneous writing of data and performing the operation from the occurrence of the error to the detection. Redundant write operation can be reduced.

Also, an impact error / write stop signal 8
By 0, the drive control processor 34 detects the error and reports the error to the controller control processor 24 via the disk interface 60. By this report, the controller control processor 24 can execute the retry operation without the redundant write operation performed from the error occurrence point to the detection.

FIG. 2 shows an erroneous write portion when a write error occurs due to an impact in the IDless system and a redundant write operation amount in the conventional system for the present invention.

[0014]

As described above, it is possible to detect an error when a shock is applied by the shock sensor or the like that detects a shock as described above. Thus, by terminating the writing operation, erroneous writing can be suppressed, and redundant writing operation performed from the occurrence of the error to the detection of the error can be reduced. Further, since the retry operation can be performed without the redundant write operation, the retry processing time can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a magnetic disk control device according to the present invention.

FIG. 2 is an explanatory diagram of an erroneous write portion and a redundant write operation when a write error occurs due to an impact in the IDless system.

[Explanation of symbols]

10 host computer, 20 controller controller, 21 interface controller
22: Hard disk controller, 23: Buffer controller (buffer), 24: Controller control processor, 30: Drive controller, 31: Read / write controller, 32: Servo controller, 33
... Shock sensor, 34 ... Drive control processor, 40 ... Magnetic disk, 5
0: Host interface, 60: Disk interface, 70: Drive interface, 80
… Shock error and light stop signal.

Claims (5)

[Claims] In a magnetic disk device that is used as an external storage device by a host computer, a write error is reported when a shock that causes a data write error to be applied to a medium is applied in order to improve performance and reliability. A retry control method for a magnetic disk drive, characterized in that a retry operation is performed in which the write operation is immediately terminated and writing is performed again after the servo operation. 2. The magnetic disk drive according to claim 1, wherein an error threshold value is set for a degree of impact from a head position error caused by the impact, an error is reported based on the degree of impact, and the writing operation is terminated. A retry control method for a magnetic disk drive, wherein a write operation is performed after servo. 3. The retry control method according to claim 1, wherein an error threshold value is set for an impact degree from a head position error generated by the impact, and the error is transmitted from the drive control processor to the controller control processor based on the impact degree. A retry control method for a magnetic disk device, wherein the retry control method is a reporting method for notifying the retry. 4. The retry control method according to claim 1, wherein an error is detected based on a degree of impact, the write operation is terminated, and erroneous write due to a write position shift due to an impact is prevented, thereby causing data destruction or unwritten data due to erroneous write. A retry control method for a magnetic disk drive, wherein reliability is improved by eliminating the problem. 5. The magnetic disk drive according to claim 1, wherein in the ID-less system, no error is detected in servo units,
A retry control method for a magnetic disk drive, characterized in that an error is detected when an impact is applied so that a redundant write operation from an error occurrence position to a servo is not performed, thereby reducing overhead of a retry processing time and improving performance.