Low power hard disk drive using multiple, individually controllable actuators

• US 6,819,513 B2
• Filed: 01/02/2002
• Issued: 11/16/2004
• Est. Priority Date: 01/02/2002
• Status: Expired due to Fees

• Current Assignee: HGST Netherlands B.V. (Western Digital Corporation)
• Original Assignee: Hitachi Global Storage Technologies Netherlands BV (Western Digital Corporation)
• Inventors: Praino, Anthony P., Chainer, Timothy J.
• Primary Examiner(s): Hudspeth, David
• Assistant Examiner(s): DAVIDSON, DAN
• Application Number:
  US10/038,699
• Publication Number:
  US 20030126158A1
• Time in Patent Office: 1,049 Days
• Field of Search: 360/61, 360/63, 360/75, 360/60
• US Class Current: 360/63
• CPC Class Codes: G11B 5/4976 Disposition of heads, e.g. matrix arrangement
• 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
• CPC Class Codes: G11B 5/5552 using fine positioning means for track acquisition separate from the coarse (e.g. track changing) positioning means

Abstract

A disk drive which incorporates separate actuators for each recording head so as to only place required recording heads over the recording media of multiple surface hard disk drives. The reduction in recording heads that are placed over the recording media reduces drag on the rotating disk holding the recording media and thereby reduces the power consumption. Reducing the number of recording heads over the recording media also reduces damage to the recording media surfaces in the event of a physical shock to the drive since inactive transducer heads are not in a position to damage the recording media.

Claims

1. A method for placing a recording head over a recording media within a rotatable storage device, the method comprising the steps of:

maintaining a plurality of recording heads within the rotatable storage device, wherein each recording head within the plurality of recording heads is individually activated and wherein each of the recording heads is parked when not activated;

determining a required recording head to access a requested data set, wherein the requested data set is stored within the rotatable storage device and wherein the required recording head is a recording head which accesses the requested data set; and

activating only the required recording head to access the requested data set.

2. The method of claim 1, wherein one or more of the recording heads is parked by placement of the one or more recording heads on a load/unload ramp.

3. The method of claim 1, wherein one or more of the recording heads is parked by operating the one or more of the recording heads in a power savings mode.

4. The method of claim 1, further comprising the steps of:

determining a damaged recording surface within the rotatable storage device; and

ceasing further use of a recording head that is associated with the damaged recording surface.

5. The method of claim 4, further comprising the step of copying data on the damaged recording surface to another recording surface.

6. A disk drive, comprising:

a plurality of recording heads within the disk drive, wherein each recording head within the plurality of recording head is individually activated and wherein each of the recording heads Is parked when not activated; and

a disk drive controller for determining a required recording head to access a requested data set, wherein the requested data set is stored within the disk drive and wherein the required recording head is a recording head which accesses the requested data set.

7. The disk drive of claim 6, wherein one or more of the recording heads is parked by placement of the one or more recording heads on a load/unload ramp.

8. The disk drive of claim 6, wherein one or more of the recording heads is parked by operating the one or more of recording heads in a power savings mode.

9. The disk drive of claim 6, wherein the disk drive controller further determines a subset of the plurality of recording heads to remain active and activates the subset of the plurality of recording heads.

10. The disk drive of claim 9, wherein the disk drive controller further determines a subset of the plurality of recording heads to remain active in order to improve data access performance.

11. The disk drive of claim 9, wherein the disk drive controller further determines a damaged recording surface within the disk drive and ceases further use of a recording head that is associated with the damaged recording surface.

12. The disk drive of claim 11, wherein the disk drive controller is further configured to copy data on the damaged recording surface to another recording surface.

13. A computer readable medium including computer instructions for a disk drive controller, the computer instructions comprising instructions for:

controlling a plurality of recording heads within a disk drive, wherein each recording head within the plurality of recording head is individually activated and wherein each recording head is parked when not activated;

determining a required recording head to access a requested data set, wherein the requested data set is stored within the disk drive and wherein the required recording head is a recording head which accesses the requested data set; and

activating only the required recording head to access the requested data set.

14. The computer readable medium of claim 13, wherein one or more of the recording heads is parked by placement or the one or more recording heads on a load/unload ramp.

15. The computer readable medium of claim 13, wherein one or more of the recording heads is parked by operating the one or more of the recording heads in a power savings mode.

16. The computer readable medium of claim 13, further including computer instructions for:

determining a damaged recording surface within the disk drive; and

ceasing further use of a recording head that is associated with the damaged recording surface.

17. The computer readable medium of claim 16, further comprising instruction copying data on the damaged recording surface to another recording surface.