Electronic system with media recovery mechanism and method of operation thereof

• US 9,064,504 B1
• Filed: 04/24/2014
• Issued: 06/23/2015
• Est. Priority Date: 01/29/2014
• Status: Active Grant

• Current Assignee: JP Morgan Chase Bank, N.A. (JP Morgan Chase & Co)
• Original Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Inventors: Boyle, William B., Hiller, Bernhard, Peng, Jih-Ping, Sannino, Anthony P.
• Primary Examiner(s): Neyzari, Ali
• Application Number:
  US14/260,641
• Time in Patent Office: 425 Days
• Field of Search: 360/63, 360/69, 360/75, 360/55, 360/78.08, 360/53, 360/77.04, 360/48, 360/31, 360/51, 360/235.1, 360/235, 360/4, 360/235.5, 360/70
• US Class Current: 1/1
• CPC Class Codes: G11B 2005/0021 Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal
• CPC Class Codes: G11B 21/08 Track changing or selecting G11B21/12 takes precedenceduring transducing operation
• CPC Class Codes: G11B 5/02 Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
• CPC Class Codes: G11B 5/455 Arrangements for functional testing of heads; Measuring arrangements for heads
• CPC Class Codes: G11B 5/6005 Specially adapted for spacing from a rotating disc using a fluid cushion
• CPC Class Codes: G11B 5/6011 Control of flying height
• CPC Class Codes: G11B 5/6064 using air pressure
• CPC Class Codes: G11B 5/6076 Detecting head-disk contact

Abstract

An apparatus includes: a media; a head over the media; and control circuitry, coupled to the heads, configured to: select an operational head from the heads based on margin data collected under a lube waterfall condition, and perform an access to the media with the operational head.

Claims

1. An apparatus comprising:

a media;

heads over the media; and

control circuitry, coupled to the heads, configured to;

select an operational head from the heads based on margin data collected under a lube waterfall condition, and

perform an access to the media with the operational head.

2. The apparatus as claimed in claim 1 wherein the operational head comprises at least one of the heads less susceptible to the lube waterfall condition.

3. The apparatus as claimed in claim 1 wherein the access comprises the access under the lube waterfall condition.

4. The apparatus as claimed in claim 1 wherein the access comprises a write.

5. The apparatus as claimed in claim 1 wherein the control circuitry is further configured to perform the access with the operational head for a pre-determined amount of time after a power on.

6. The apparatus as claimed in claim 1 wherein the control circuitry is further configured to determine an active zone on the media with a currently selected head.

7. The apparatus as claimed in claim 6 wherein the control circuitry is further configured to close the active zone accessed by the currently selected head.

8. The apparatus as claimed in claim 6 wherein the control circuitry is further configured to select a different active zone with one of the heads different from the currently selected head.

9. The apparatus as claimed in claim 8 wherein the control circuitry is further configured to confine the selected different active zone to the operational head.

10. The apparatus as claimed in claim 1 wherein the control circuitry is further configured to perform a write of the media with a currently selected head.

11. A method operating an apparatus including heads over a media, the method comprising:

determining an operational head from the heads based on margin data collected under a lube waterfall condition; and

performing an access to the media with the operational head.

12. The method as claimed in claim 11 wherein the operational head comprises at least one of the heads less susceptible to the lube waterfall condition.

13. The method as claimed in claim 11 wherein performing the access comprises performing the access under the lube waterfall condition.

14. The method as claimed in claim 11 wherein the access comprises a write.

15. The method as claimed in claim 11 wherein performing the access comprises performing the access with the operational head for a pre-determined amount of time after a power on.

16. The method as claimed in claim 11 wherein determining the operational head comprises determining an active zone on the media with a currently selected head.

17. The method as claimed in claim 16 wherein determining the operational head comprises closing the active zone accessed by the currently selected head.

18. The method as claimed in claim 16 wherein determining the operational head comprises selecting a different active zone with one of the heads different from the currently selected head.

19. The method as claimed in claim 18 further comprising confining the active zone on the media with the operational head.

20. The method as claimed in claim 11 wherein determining the operational head comprises performing a write of the media with the heads under the lube waterfall condition and reading from a currently selected head after the lube waterfall condition.