Allowing fast data zone switches on data storage devices

• US 9,466,318 B2
• Filed: 01/20/2016
• Issued: 10/11/2016
• Est. Priority Date: 12/24/2014
• 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: Giovenzana, Davide, Soderbloom, Paul E.
• Primary Examiner(s): Neyzari, Ali
• Application Number:
  US15/001,730
• Publication Number:
  US 20160189734A1
• Time in Patent Office: 265 Days
• Field of Search: 360/39, 360/53, 360/51, 369/13.04, 369/13.05, 369/13.14
• US Class Current: 1/1
• CPC Class Codes: G11B 20/10268 bit detection or demodulation methods
• CPC Class Codes: G11B 20/1217 on discs
• CPC Class Codes: G11B 2020/1242 the area forming one or more zones, wherein each zone is shaped like an annulus or a circular sector
• CPC Class Codes: G11B 2020/185 using an low density parity check [LDPC] code
• CPC Class Codes: G11B 5/012 Recording on, or reproducing or erasing from, magnetic disks G11B17/00, G11B19/00 take precedence
• CPC Class Codes: G11B 5/09 Digital recording
• CPC Class Codes: G11B 7/1267 Power calibration

Abstract

Some embodiments described herein are directed to reducing or eliminating latency caused by data zone switches in a rotating magnetic storage device. More specifically, some embodiments described herein are directed to storing parameters associated with different zones in a parameter register in response to one or more received commands.

Claims

1. A data storage device, comprising:

a memory;

a channel having a parameter register; and

a controller configured to;

initiate processing of a first read command prior to completion of a decoding process of data associated with a previously received read command;

store data associated with the first read command in the channel; and

associate the data associated with the first read command with a first parameter in the parameter register, wherein the channel is configured to initiate decoding of the data stored in the channel using the associated first parameter prior to completion of the decoding process of the data associated with the previously received read command.

2. The data storage device of claim 1, wherein the channel further comprises a low density parity check decoder, wherein the low density parity check decoder is configured to decode the data associated with the previously received read command.

3. The data storage device of claim 1, wherein the channel is further configured to determine whether the parameter register has capacity for the parameter associated with the data in the channel.

4. The data storage device of claim 1, wherein the first parameter is a decoder setting associated with the first read command.

5. The data storage device of claim 1, wherein the data associated with the previously received read command is in a first storage location and the data associated with the first read command is in a second storage location.

6. The data storage device of claim 1, wherein the controller is further configured to:

receive a second read command from a host device prior to completion of the decoding process of the data associated with the previously received read command;

store data associated with the second read command in the channel; and

associate the data associated with the second read command with a second parameter in the parameter register.

7. A device, comprising:

a channel having a parameter register; and

a controller configured to;

initiate processing of a first read command prior to completion of a decoding process of data associated with a previously received read command;

store data associated with the first read command in the channel; and

associate the data associated with the first read command with a first parameter in the parameter register, wherein the channel is configured to initiate decoding of the data stored in the channel using the associated first parameter prior to completion of the decoding process of the data associated with the previously received read command.

8. The device of claim 7, wherein the channel further comprises a parity check decoder configured to decode the data associated with the previously received read command.

9. The device of claim 7, wherein the channel is further configured to determine whether the parameter register has capacity for the parameter associated with the data in the channel.

10. The device of claim 7, wherein the first parameter is a decoder setting associated with the first read command.

11. The device of claim 7, wherein the first parameter is a decoder setting associated with a location of the data associated with the first read command.

12. The device of claim 7, wherein the first parameter is a frequency setting associated with a location of the data associated with the first read command.

13. The device of claim 7, wherein the data associated with the previously received read command is in a first storage location and the data associated with the first read command is in a second storage location.

14. The device of claim 7, wherein the controller is further configured to:

receive a second read command prior to completion of the decoding process of the data associated with the previously received read command;

store data associated with the second read command in the channel; and

associate the data associated with the second read command with a second parameter in the parameter register.

15. The device of claim 14, wherein the second parameter is different than the first parameter.

16. The device of claim 14, wherein the controller is further configured to:

receive a third read command prior to completion of the decoding process of at least one of the previously received read command, the first read command or the second read command;

store data associated with the third read command in the channel; and

determine whether the data associated with the third read command is associated with at least one parameter previously stored in the parameter register.

17. The device of claim 16, wherein the controller is further configured to use the at least one parameter that was previously stored in the parameter register when decoding the third read command.

18. A device, comprising:

a channel;

a parameter register associated with the channel; and

a controller configured to;

initiate processing of a read command while executing a decoding process associated with a previously received read command;

store data associated with the read command in the channel;

determine whether a parameter in the parameter register is associated with the data; and

cause the channel to initiate decoding of the data stored in the channel using the parameter prior to completion of the decoding process of the data associated with the previously received read command.

19. The device of claim 18, wherein the controller is further configured to store a second parameter in the parameter register when it is determined that the parameter in the parameter register is not associated with the data.

20. The device of claim 19, wherein the channel is further configured to determine whether the parameter register has capacity for the second parameter.