Method and apparatus for disk shock protection

• US 5,963,392 A
• Filed: 06/05/1997
• Issued: 10/05/1999
• Est. Priority Date: 06/05/1997
• Status: Expired due to Term

• Current Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Original Assignee: International Business Machines Corporation
• Inventors: Kumar, Suresh, Dang, Hien Phu, Khanna, Vijayeshwar Das, Sri-Jayantha, Sri Muthuthamby
• Primary Examiner(s): Psitos, Aristotelis M.
• Assistant Examiner(s): WONG, KIN C
• Application Number:
  US08/869,562
• Time in Patent Office: 852 Days
• Field of Search: 360/135, 360/133, 360/75, 360/105, 360/78.04
• US Class Current: 360/75
• CPC Class Codes: G11B 19/04 Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
• CPC Class Codes: G11B 5/54 with provision for moving the head into or out of its operative position or across tracks
• CPC Class Codes: G11B 5/5582 system adaptation for working during or after external perturbation, e.g. in the presence of a mechanical oscillation caused by a shock
• CPC Class Codes: G11B 5/82 Disk carriers

Abstract

A data storage device 12 includes a disk 14 having a surface zone 14a for storing data, and an access head 18 mounted on a slider 20 for writing data to and reading data from the data zone. The head 18 flies across the data zone 14a to access selected data tracks during spinning of the disk. And, the slider 20 seeks a predetermined shock buffer zone 30 atop the spinning disk, where critical data is not stored, during an idle mode for confining thereto any shock induced contact between the slider and disk surface.

Claims

1. A data storage device 12 comprising:

a disk 14 having an annular surface zone 14a extending radially between inner and outer boundaries 14b,c for storing data;

means 16 for spinning said disk 14;

an access head 18 mounted on a slider 20 for writing data to and reading data from said data zone 14a;

means 22 for flying said head 18 across said data zone 14a; and

means 28 for seeking said slider 20 to a predetermined shock buffer zone 30 atop said spinning disk during an idle mode when said data is neither written to nor read from said data zone 14a.

2. A device according to claim 1 wherein:

said flying means 22 include said slider 20 configured for effecting an air bearing 26 atop said spinning disk; and

said slider 20 and shock buffer zone 30 have corresponding widths A,B, with said shock buffer zone width B being at least as large as said slider width A.

3. A device according to claim 2 wherein said shock buffer zone 30 is disposed in said data zone 14a to define shock protected and unprotected regions thereof.

4. A device according to claim 3 wherein said seeking means 28 are configured to progressively relocate said shock buffer zone 30b radially as said data zone 14a is progressively filled with said data from one of said two boundaries 14b,c.

5. A device according to claim 3 wherein said seeking means 28 are configured to locate said shock buffer zone 30 at a fixed radial position.

6. A device according to claim 5 wherein said seeking means 28 are configured to space said shock buffer zone 30 radially between said inner and outer boundaries 14b,c of said data zone 14a.

7. A device according to claim 5 wherein said seeking means 28 are configured to locate said shock buffer zone 30d at said outer boundary 14c.

8. A device according to claim 5 wherein said seeking means are configured to locate said shock buffer zone 30c at said inner boundary 14b.

9. A device according to claim 3 wherein said seeking means 28 are configured to return said slider 20 immediately to said shock buffer zone 30 after accessing data in said data zone 14a.

10. A device according to claim 3 wherein said seeking means 28 are configured to return said slider 20 to said shock buffer zone 30 upon a predetermined time delay after accessing data in said data zone 14a.

11. A device according to claim 10 wherein said time delay is about 0.5 seconds.

12. A device according to claim 3 wherein said data zone 14a includes a plurality of tracks, and said seeking means 28 are configured to reference said tracks to center said slider 20 in said shock buffer zone 30.

13. A device according to claim 3 in combination with a programmable computer 10, and further comprising:

application software 10a stored in said computer 10;

disk operating system software 10b stored in said computer 10;

a device driver 10c operatively joined between said computer 10 and said data storage device 12 for driving operation thereof; and

wherein said seeking means 28 are effective for intercepting disk commands from said computer to said flying means 22 to effect said shock buffer zone 30.

14. A method for enhancing data integrity stored in a data zone 14a of a spinning disk 14 accessible by a slider 20 mounted access head 18, comprising:

flying said access head 18 across said data zone 14a to write data thereto and read data therefrom; and

seeking said slider 20 to a predetermined shock buffer zone 30 atop said spinning disk 14 during an idle mode when said data is neither written to nor read from said data zone 14a.

15. A method according to claim 14 wherein said shock buffer zone 30 is disposed in said data zone 14a to define shock protected and unprotected regions thereof.

16. A method according to claim 15 wherein said shock buffer zone 30b is progressively relocated radially as said data zone 14a is progressively filled with said data from one of two boundaries 14b,c bounding said data zone 14a.

17. A method according to claim 15 wherein said slider 20 is returned to said shock buffer zone 30 upon a predetermined time delay after accessing data in said data zone 14a.

18. A method according to claim 17 wherein said time delay is selectively variable.

19. A method according to claim 15 further comprising moving said buffer zone to a different location atop said spinning disk upon damage to said disk at said predetermined zone.

20. A method according to claim 15 further comprising:

writing temporary data on said disk at said buffer zone; and

writing permanent data on said disk outside said buffer zone.