Systems and methods for improving sequential data rate performance using sorted data zones

• US 8,902,527 B1
• Filed: 02/28/2014
• Issued: 12/02/2014
• Est. Priority Date: 03/22/2010
• Status: Active Grant

• Current Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Original Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Inventors: Coker, Kenny T., Meyer, Alan T., Warner, Nicholas M.
• Primary Examiner(s): BLOUIN, MARK S
• Application Number:
  US14/194,243
• Time in Patent Office: 277 Days
• Field of Search: 360/48
• US Class Current: 360/48
• CPC Class Codes: G11B 20/1217 on discs
• CPC Class Codes: G11B 2020/10981 Recording or reproducing data when the data rate or the relative speed between record carrier and transducer is variable
• CPC Class Codes: G11B 2220/20 Disc-shaped record carriers
• CPC Class Codes: G11B 5/5521 across disk tracks spiral track following G11B5/596
• CPC Class Codes: G11B 5/59633 Servo formatting G11B5/59627, G11B5/59677, G11B5/59683, G11B5/59688 take precedence

Abstract

Systems and methods for writing a sequence of data to a disk drive using sorted data zones are provided. One embodiment includes a disk drive comprising one or more disks having a plurality of disk surfaces, wherein each disk surface comprises a plurality of data zones, each data zone having a data transfer rate; a plurality of heads, wherein each head is configured to write data to a respective one of the disk surfaces; and a controller configured to operate the plurality of heads to sequentially write a sequence of data blocks to the plurality of disk surfaces in accordance with an order of head-zone combinations ordered from highest data transfer rate to lowest data transfer rate, each head-zone combination corresponding to one of the heads and one of the data zones of the respective disk surface.

Claims

1. A disk drive comprising:

one or more disks having a plurality of disk surfaces, wherein each disk surface comprises a plurality of data zones, each data zone having a data transfer rate;

a plurality of heads, each head configured to write data to a respective one of the disk surfaces; and

a controller configured to operate the plurality of heads to sequentially write a sequence of data blocks to the plurality of disk surfaces in accordance with an order of head-zone combinations ordered from highest data transfer rate to lowest data transfer rate, each head-zone combination corresponding to one of the heads and one of the data zones of the respective disk surface.

2. The disk drive of claim 1, wherein the controller is further configured to operate the plurality of heads to write the sequence of data blocks by sequentially progressing through the head-zone combinations in descending order, and for each head-zone combination, using the corresponding head to write a portion of the data blocks to the corresponding data zone.

3. The disk drive of claim 1, wherein the controller is further configured to operate the plurality of heads to write the sequence of data blocks by causing the heads to perform a sequence of head switches and track seeks to sequentially write the data blocks to tracks on the plurality of disk surfaces along an access path, wherein the access path is defined by sequentially progressing through the head-zone combinations in descending order.

4. The disk drive of claim 1, wherein the sequence of data blocks correspond to a sequence of logical block addresses.

5. The disk drive of claim 1, wherein each data zone comprises a plurality of concentric data tracks on the respective disk surface.

6. The disk drive of claim 5, wherein each data zone has a different number of sectors per track than the other zones of the respective disk surface.

7. The disk drive of claim 1, wherein the plurality of data zones of one of the disk surfaces has a different range of data transfer rates than the plurality of data zones of another one of the disk surfaces.

8. A method of operating a disk drive comprising a plurality of heads and a plurality of disk surfaces, wherein each disk surface comprising a plurality of data zones, each data zone having a data transfer rate, and wherein each head is configured to write data to a respective one of the disk surfaces, the method comprising:

sequentially writing a sequence of data blocks to the plurality of disk surfaces in accordance with an order of head-zone combinations ordered from highest data transfer rate to lowest data transfer rate, each head-zone combination corresponding to one of the heads and one of the data zones of the respective disk surface.

9. The method of claim 8, wherein the sequentially writing the sequence of data blocks comprises:

sequentially progressing through the head-zone combinations in descending order; and

for each head-zone combination, writing a portion of the data blocks to the corresponding data zone using the corresponding head.

10. The method of claim 8, wherein the sequentially writing the sequence of data blocks comprises:

performing a sequence of head switches and track seeks of the heads to sequentially write the data blocks to tracks on the plurality of disk surfaces along an access path, wherein the access path is defined by sequentially progressing through the head-zone combinations in descending order.

11. The method of claim 8, wherein the sequence of data blocks correspond to a sequence of logical block addresses.

12. The method of claim 8, wherein each data zone comprises a plurality of concentric data tracks on the respective disk surface.

13. The method of claim 12, wherein each data zone has a different number of sectors per track than the other zones of the respective disk surface.

14. The method of claim 8, wherein the plurality of data zones of one of the disk surfaces has a different range of data transfer rates than the plurality of data zones of another one of the disk surfaces.

15. A method for formatting a disk drive comprising a plurality of heads and a plurality of disk surfaces, wherein each disk surface comprises a plurality of data zones, each data zone having a data transfer rate, and wherein each head is configured to write data to a respective one of the disk surfaces, the method comprising:

determining the data transfer rate of each of a plurality of head-zone combinations, each head-zone combination corresponding to one of the heads and one of the data zones of the respective disk surface;

ordering the head-zone combinations from highest data transfer rate to lowest data transfer rate; and

storing data related to the ordering in the disk drive.

16. The method of claim 15, wherein each data zone comprises a plurality of concentric data tracks on the respective disk surface.

17. The method of claim 16, wherein each data zone has a different number of sectors per track than the other zones of the respective disk surface.

18. The method of claim 15, wherein the plurality of data zones of one of the disk surfaces has a different range of data transfer rates than the plurality of data zones of another one of the disk surfaces.

19. A disk drive comprising:

one or more disks having a plurality of disk surfaces, wherein each disk surface comprises a plurality of data zones, each data zone having a data transfer rate;

a plurality of heads, each head configured to write data to a respective one of the disk surfaces; and

a controller configured to operate the plurality of heads to access data on the plurality of disk surfaces according to a logical addressing that maps logical addresses according to an order of head-zone combinations ordered from highest data transfer rate to lowest data transfer rate, each head-zone combination corresponding to one of the heads and one of the data zones of the respective disk surface.

20. The disk drive of claim 19, wherein the logical addressing corresponds to a sequence of logical block addresses.

21. The disk drive of claim 19, wherein the logical addressing sequentially progresses through the head-zone combinations in descending order.

22. The disk drive of claim 19, wherein the controller is further configured to operate the plurality of heads to follow the logical addressing by causing the heads to perform a sequence of head switches and track seeks to write data blocks to tracks on the plurality of disk surfaces along an access path, wherein the access path is defined by sequentially progressing through the head-zone combinations in descending order.