Disk storage device and a method for processing defective sectors in a disk storage device

• US 6,636,985 B1
• Filed: 06/09/2000
• Issued: 10/21/2003
• Est. Priority Date: 06/11/1999
• Status: Expired due to Term

• Current Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Original Assignee: International Business Machines Corporation
• Inventors: Asano, Hideo, Kanamaru, Atsushi, Ono, Hiroyuki
• Primary Examiner(s): Beausoliel, Robert
• Assistant Examiner(s): Damiano, Anne L.
• Application Number:
  US09/591,257
• Time in Patent Office: 1,229 Days
• Field of Search: 714/8, 714/42, 369/53.15, 369/43
• US Class Current: 714/6.13
• CPC Class Codes: G11B 20/1816 Testing
• CPC Class Codes: G11B 20/1883 Methods for assignment of alternate areas for defective areas
• CPC Class Codes: G11B 2220/20 Disc-shaped record carriers

Abstract

A disk storage device is disclosed for avoiding the instantaneous performance degradation as much as possible, and a method for processing a defective sector in such a disk storage device. There is executed a predetermined check related to a function of the disk storage device, preferably at least one of a read test, a write servo test, or a write test, when the disk storage device is in a waiting state where the disk storage device has no access from a host. The read test and write servo test are used to search for a defective sector on a disk and reassign the defective sector. The write test is used to indicate an abnormal condition of a head. Furthermore, the disk storage device includes a detector for detecting the waiting state, and a check logic for executing a predetermined check.

Claims

1. A method for processing defective sectors in a disk storage device, comprising the step of:

detecting that the disk storage device is in a waiting state such that the disk storage device is not being accessed by a host; and

executing a predetermined check related to a function of the disk storage device when the disk storage device is in the waiting state by executing a write servo test for searching for defective sectors on disks and reassigning the defective sectors.

2. The method for processing defective sectors in a disk storage device according to claim 1, wherein the step of executing said predetermined check further comprises the step of executing a read test for searching for defective sectors on disks and reassigning the defective sectors.

3. The method for processing defective sectors in a disk storage device according to claim 1, wherein the step of executing said predetermined check further comprises the step of executing a write test for searching for indicating an abnormal condition of heads included within said disk storage device.

4. The method for processing defective sectors in a disk storage device according to claim 1, further comprising the steps of:

generating a host command while said predetermined check is being executed;

suspending said predetermined check which is being executed; and

executing said generated host command such that said host command is given priority.

5. The method for processing defective sectors in a disk storage device according to claim 1, further comprising the steps of:

providing a register within said disk storage device in which a position of a sector accessed during said predetermined check currently being executed is stored;

sequentially updating said position as the check proceeds; and

storing a content of said register in the disk when a predetermined time has elapsed after said disk storage device is no longer being accessed by a host utilizing a command, so that the value of the accessed sector can be recovered even after the power is shut off and the content of the register is cleared.

6. The method for processing defective sectors in a disk storage device according to claim 5, further comprising the step of storing the content of said register in the disk at regular time intervals.

7. The method for processing defective sectors in a disk storage device according to claim 5, further comprising the step of storing the content of said register in the disk once in a number of accesses.

8. The method for processing defective sectors in a disk storage device according to claim 1, further comprising the steps of:

providing a register within said disk storage device in which a position of a sector accessed during said predetermined check currently being executed is stored;

sequentially updating said position as the check proceeds; and

recovering the content of the register including the value of the accessed sector which is to be accessed to restart the check when a host command is provided during the check.

9. The method for processing defective sectors in a disk storage device according to claim 8, further comprising the step of storing the content of said register in the disk at regular time intervals.

10. The method for processing defective sectors in a disk storage device according to claim 8, further comprising the step of storing the content of said register in the disk once in a number of accesses.

11. The method for processing defective sectors in a disk storage device according to claim 1, further comprising the step of providing a mode flag within the disk storage device in which the type of the test currently being executed is stored.

12. A disk storage device for processing defective sectors the device, comprising:

means for detecting that the disk storage device is in a waiting state such that the disk storage device is not being accessed by a host; and

means for executing a predetermined check related to a function of the disk storage device when the disk storage device is in the waiting state by executing a write servo test for searching for defective sectors on disks and reassigning the defective sectors.

13. The device according to claim 12, wherein said means for executing said predetermined check further comprises means for executing a read test for searching for defective sectors on disks and reassigning the defective sectors.

14. The device according to claim 12, wherein said means for executing said predetermined check further comprises means for executing a write test for searching for indicating an abnormal condition of heads included within said disk storage device.

15. The device according to claim 12, further comprising:

means for generating a host command while said predetermined check is being executed;

means for suspending said predetermined check which is being executed; and

means for executing said generated host command such that said host command is given priority.

16. The device according to claim 12, further comprising:

a register within said disk storage device in which a position of a sector accessed during said predetermined check currently being executed is stored;

means for sequentially updating said position as the check proceeds; and

means for storing a content of said register in the disk when a predetermined time has elapsed after said disk storage device is no longer being accessed by a host utilizing a command, so that the value of the accessed sector can be recovered even after the power is shut off and the content of the register is cleared.

17. The device according to claim 16, further comprising means for storing the content of said register in the disk at regular time intervals.

18. The device according to claim 16, further comprising means for storing the content of said register in the disk once in a number of accesses.

19. The device according to claim 12, further comprising:

a register within said disk storage device in which a position of a sector accessed during said predetermined check currently being executed is stored;

means for sequentially updating said position as the check proceeds; and

means for recovering the content of the register including the value of the accessed sector which is to be accessed to restart the check when a host command is provided during the check.

20. The device according to claim 19, further comprising means for storing the content of said register in the disk at regular time intervals.

21. The device according to claim 19, further comprising means for storing the content of said register in the disk once in a number of accesses.

22. The device according to claim 12, further comprising means for providing a mode flag within the disk storage device in which the type of the test currently being executed is stored.