Prioritized random access for magnetic recording

• US 9,601,154 B2
• Filed: 04/29/2015
• Issued: 03/21/2017
• Est. Priority Date: 11/24/2014
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Zhu, Wenzhong, Gao, Kaizhong, Gage, Edward
• Primary Examiner(s): Neyzari, Ali
• Application Number:
  US14/699,834
• Publication Number:
  US 20160148644A1
• Time in Patent Office: 692 Days
• Field of Search: 360/53
• US Class Current: 1/1
• CPC Class Codes: G06F 12/0238 Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory
• CPC Class Codes: G06F 2212/1044 Space efficiency improvement
• CPC Class Codes: G06F 2212/152 Virtualized environment, e.g. logically partitioned system
• CPC Class Codes: G06F 2212/21 Employing a record carrier using a specific recording technology
• CPC Class Codes: G06F 2212/70 Details relating to dynamic memory management
• CPC Class Codes: G11B 20/1217 on discs
• CPC Class Codes: G11B 2020/1238 track, i.e. the entire a spirally or concentrically arranged path on which the recording marks are located
• CPC Class Codes: G11B 2020/1292 Enhancement of the total storage capacity
• 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

Abstract

A storage device includes a controller that directs incoming data to a storage location based on a capacity of a region or surface of a magnetic disc. According to one implementation, the storage device controller writes new data to data tracks in a first series of data tracks on the magnetic disc until a capacity condition is satisfied. Once the capacity condition is satisfied, the storage device controller writes new data to a second series of data tracks on the storage medium that are interlaced with data tracks of the first series.

Claims

1. Apparatus comprising:

storage device controller configured to;

responsive to receipt of a write command specifying new data, determine whether a first capacity condition is satisfied; and

write new data exclusively to data tracks in a first series of data tracks on a storage medium if the first capacity is not satisfied, each of the data tracks of the first series being interlaced with data tracks of a second series.

2. The apparatus of claim 1, wherein the first series of data tracks is a series of alternating data tracks.

3. The apparatus of claim 1, wherein the storage device controller writes new data to data tracks in a third series of data tracks on the storage medium after a second capacity condition is satisfied, wherein the data tracks in the third series are each separated from one another by at least one track of the first series and at least one track of the second series.

4. The apparatus of claim 3, wherein the first series of data tracks and the second series of data tracks are in a same region of the storage medium and a capacity of the same region is higher when the second capacity condition is satisfied than when the first capacity condition is satisfied.

5. The apparatus of claim 3, wherein the new data stored in the third series of data tracks is at a different linear density that the new data stored in either of the first series of data tracks and the second series of data tracks.

6. The apparatus of claim 1, wherein the new data stored in the first series of data tracks is at a higher linear density than the new data stored in the second series of data tracks.

7. The apparatus of claim 1, wherein the first series of data tracks and the second series of data tracks have different written track widths.

15. The apparatus of claim 1, wherein the storage device controller is further configured to write the new data exclusively to data tracks in the second series of data tracks on the storage medium if the capacity condition is satisfied.

8. A method comprising:

responsive to receipt of a write command specifying new data, determining whether a first capacity condition is satisfied;

writing the new data exclusively to data tracks in a first series of data tracks on a storage medium if the first capacity is not satisfied; and

writing the new data exclusively to data tracks in a second series of data tracks on the storage medium if capacity condition is satisfied, each of the data tracks of the second series being interlaced with data tracks of the first series.

9. The method claim 8, wherein the first series of data tracks is a series of alternating data tracks.

10. The method of claim 8, further comprising:

writing data to data tracks in a third series of data tracks on the storage medium after a second capacity condition is satisfied, wherein the data tracks in the third series are each separated from one another by at least one track of the first series and at least one track of the second series.

11. The method of claim 10, wherein the first series of data tracks and the second series of data tracks are in a same region of the storage medium and a capacity of the same region is higher when the second capacity condition is satisfied than when the first capacity condition is satisfied.

12. The method of claim 10, wherein the new data stored in the third series of data tracks is at a different linear density that the new data stored in either of the first series of data tracks and the second series of data tracks.

13. The method of claim 8, wherein the new data stored in the first series of data tracks is at a higher linear density than the new data stored in the second series of data tracks.

14. The method of claim 8, wherein the first series of data tracks and the second series of data tracks have different written track widths.

16. One or more tangible computer-readable storage media encoding computer-executable instructions for executing on a computer system a computer process, the computer process comprising:

responsive to receipt of a write command specifying new data, determining whether a first capacity condition is satisfied; and

writing the new data exclusively to data tracks in a first series of data tracks on a storage medium if the first capacity is not satisfied, each of the data tracks of the first series being interlaced with data tracks of a second series.

17. The one or more computer-readable storage media of claim 16, wherein the computer process further comprises writing the new data exclusively to data tracks in the second series of data tracks on the storage medium if the capacity condition is satisfied.

18. The one or more computer-readable storage media of claim 16, wherein the first series of data tracks is a series of alternating data tracks.

19. The one or more computer-readable storage media of claim 16, wherein the first series of data tracks and the second series of data tracks are in a same region of the storage medium and a capacity of the same region is higher when the second capacity condition is satisfied than when the first capacity condition is satisfied.