Electronic system with media maintenance mechanism and method of operation thereof

• US 9,196,302 B1
• Filed: 03/18/2015
• Issued: 11/24/2015
• Est. Priority Date: 03/18/2015
• Status: Active Grant

• Current Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Original Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Inventors: Kuan, Chin Phan, Khew, Nikki Poh Ling, Chin, Wai Shin
• Primary Examiner(s): Wong, K.
• Application Number:
  US14/662,163
• Time in Patent Office: 251 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G11B 20/10222 clock-related aspects, e.g. phase or frequency adjustment or bit synchronisation dedicated sync patterns in the modulation code G11B20/1403
• CPC Class Codes: G11B 20/10527 Audio or video recording; Data buffering arrangements G11B20/12 - G11B20/18 take precedence
• CPC Class Codes: G11B 23/505 of disk carriers
• CPC Class Codes: G11B 5/40 Protective measures on heads, e.g. against excessive temperature G11B5/31 takes precedence; protection against wear G11B5/255 ; protective structure of the head: see under structures, e.g. G11B5/3106
• CPC Class Codes: G11B 5/5526 Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof G11B5/556 takes precedence

Abstract

An apparatus includes: a media; a head over the media; a read channel, coupled to the head, configured to extract data from the media; control circuitry, coupled to the read channel, configured to execute a read command; and wherein the read channel is further configured to: generate, based on extracting the data from the media, a data condition indicator, and provide, for use by the control circuitry, the data and the data condition indicator.

Claims

1. An apparatus comprising:

a media includes a lube layer on a surface;

a memory for storing operational data;

a first head over the media; and

control circuitry, coupled to the first head, configured to;

position the first head over a first surface of the media; and

perform a leveling of the lube layer on the surface by at least;

flushing the operational data from the memory to a first reserved location of a plurality of reserved locations on the media, the flushing based at least in part on a timer;

resetting the timer; and

repositioning the head and flushing the operational data from the memory to a next reserved location of the plurality of the reserved locations on the media, the flushing based at least in part on the timer.

2. The apparatus as claimed in claim 1 further comprising a second head, wherein the control circuitry further configured to:

position the first head on the first surface of the media and the second head on a second surface of the media; and

locate the plurality of the reserved locations distributed across the media on the first surface and the second surface.

3. The apparatus as claimed in claim 1 wherein the control circuitry further configured to update the operational data in the first reserved location and the next reserved location of the plurality of reserved locations.

4. The apparatus as claimed in claim 1 wherein the control circuitry further configured to locate the plurality of the reserved locations distributed on the first surface of the media.

5. The apparatus as claimed in claim 4 wherein the control circuitry further configured to locate the plurality of the reserved locations distributed between an outer diameter (OD) and an inner diameter (ID) of the media.

6. The apparatus as claimed in claim 1 wherein the control circuitry is further configured to include a sequence number in the operational data written to the first reserved location and the next of the plurality of the reserved locations on the media.

7. The apparatus as claimed in claim 1 wherein the control circuitry is further configured to execute a shutdown command including the flush of the operational data to the next of the plurality of the reserved locations on the media.

8. The apparatus as claimed in claim 1 wherein the control circuitry is further configured to read the operational data from a last written of the plurality of the reserved locations by reading a sequence number in the operational data.

9. The apparatus as claimed in claim 1 wherein the control circuitry is further configured to detect a discontinuity in a sequence number in the operational data stored in the plurality of the reserved locations.

10. The apparatus as claimed in claim 1 wherein the control circuitry is further configured to read a sequence number associated with the operational data in a last written of the plurality of the reserved locations to identify a latest version of the operational data.

11. The apparatus as claimed in claim 1 wherein the timer is based on idle time since a previous host command was received.

12. The apparatus as claimed in claim 1 wherein the timer is based on idle time since a previous read or write of the media occurred.

13. A method of operating an apparatus, the method comprising:

positioning a first head over a media; and

leveling a lube layer on the media by at least;

flushing operational data from a memory to a first reserved location of a plurality of reserved locations on the media, the flushing based at least in part on a timer;

resetting the timer; and

repositioning the first head and flushing the operational data from the memory to a next reserved location of the plurality of the reserved locations on the media, the flushing based at least in part on the timer.

14. The method as claimed in claim 13 further comprising positioning a second head over the media opposite the head, wherein:

positioning the head over the media includes positioning a first head on a first surface of the media and positioning the second head on a second surface of the media; and

locating the plurality of the reserved locations distributed across the media on the first surface and the second surface.

15. The method as claimed in claim 13 further comprising updating the operational data in the first reserved location and the next reserved location of the plurality of reserved locations.

16. The method as claimed in claim 13 further comprising locating the plurality of the reserved locations distributed on a first surface of the media.

17. The method as claimed in claim 16 wherein locating the plurality of the reserved locations includes the plurality of the reserved locations distributed between an outer diameter (OD) and an inner diameter (ID) of the media.

18. The method as claimed in claim 13 further comprising including a sequence number in the operational data written to the first reserved location and the next reserved location of the plurality of the reserved locations on the media.

19. The method as claimed in claim 13 further comprising executing a shutdown command includes flushing of the operational data to the next reserved location of the plurality of the reserved locations on the media.

20. The method as claimed in claim 13 further comprising reading the operational data from a last written of the plurality of the reserved locations by reading a sequence number in the operational data.

21. The method as claimed in claim 13 further comprising detecting a discontinuity in a sequence number in the operational data stored in the plurality of the reserved locations.

22. The method as claimed in claim 13 further comprising reading a sequence number associated with operational data in a last written of the plurality of the reserved locations to identify a latest version of the operational data.

23. The method as claimed in claim 13 further comprising basing the timer on idle time since a previous host command was received.

24. The method as claimed in claim 13 further comprising basing the timer on idle time since a previous read or write of the media occurred.