Prioritized random access for magnetic recording

• US 9,747,943 B2
• Filed: 02/08/2017
• Issued: 08/29/2017
• Est. Priority Date: 11/24/2014
• Status: Active Grant

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Zhu, Wenzhong, Gao, Kaizhong, Gage, Edward
• Primary Examiner(s): Neyzari, Ali
• Application Number:
  US15/427,949
• Publication Number:
  US 20170148484A1
• Time in Patent Office: 202 Days
• Field of Search: 360 48
• 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. A method comprising:

writing data to a first series of data tracks within a region of a storage medium while a post-write scan operation is disabled and until a first capacity condition is satisfied, the data tracks of the first series each separated from one another by at least one interlaced data track; and

once the first capacity condition is satisfied, enabling a post-write scan operation to verify integrity of adjacent track data after a subsequent write operation.

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

3. The method of claim 1, wherein enabling the post-write scan procedure further comprises:

enabling a data track write counter to increment for a first data track each time data is recorded in a second data track directly adjacent to the first data track.

4. The method of claim 3, further comprising:

reading data of the first data track when a value of the data track write counter satisfies an increment threshold.

5. The method of claim 3, further comprising:

if a number of read errors of the first data track data satisfies an error threshold, re-writing the data of the first data track and resetting the data track write counter.

6. The method of claim 1, wherein the first capacity condition is satisfied when at least half of the data tracks in the region store data.

7. The method of claim 1, wherein the region is an entire surface of a magnetic media.

8. The method of claim 1, wherein the region is a radial zone on the magnetic media.

9. Apparatus comprising:

a storage device controller configured to;

write data to a first series of data tracks within a region of a storage medium while a post-write scan operation is disabled and until a first capacity condition is satisfied, the data tracks of the first series each separated from one another by at least one interlaced data track; and

once the first capacity condition is satisfied, enable a post-write scan operation to verify integrity of adjacent track data after a subsequent write operation.

10. The apparatus of claim 9, wherein the first series of data tracks is a series of alternating data tracks.

11. The apparatus of claim 9, wherein enabling the post-write scan procedure further comprises:

enabling a data track write counter to increment for a first data track each time data is recorded in a second data track directly adjacent to the first data track.

12. The apparatus of claim 11, further comprising:

reading data of the first data track when a value of the data track write counter satisfies an increment threshold.

13. The apparatus of claim 9, further comprising:

if a number of read errors of the first data track data satisfies an error threshold, re-writing the data of the first data track and resetting the data track write counter.

14. The apparatus of claim 9, wherein the first capacity condition is satisfied when at least half of the data tracks in the region store data.

15. The apparatus of claim 9, wherein the region is an entire surface of a magnetic media.

16. The apparatus of claim 9, wherein the region is a radial zone on the magnetic media.

17. 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:

writing data to a first series of data tracks within a region of a storage medium while a post-write scan operation is disabled and until a first capacity condition is satisfied, the data tracks of the first series each separated from one another by at least one interlaced data track; and

once the first capacity condition is satisfied, enabling a post-write scan operation to verify integrity of adjacent track data after a subsequent write operation.

18. The one or more tangible computer-readable storage media of claim 17, wherein the first series of data tracks is a series of alternating data tracks.

19. The one or more tangible computer-readable storage media of claim 17, wherein enabling the post-write scan procedure further comprises:

enabling a data track write counter to increment for a first data track each time data is recorded in a second data track directly adjacent to the first data track.

20. The one or more tangible computer-readable storage media of claim 19, wherein the computer process further comprises:

reading data of the first data track when a value of the data track write counter satisfies an increment threshold.