Post-write scan operations for interlaced magnetic recording

Patent metadata

Field	Value
Publication number	US-9679601-B2
Application number	US-201615089239-A
Country	US
Kind code	B2
Filing date	Apr 1, 2016
Priority date	Nov 24, 2014
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A storage device includes a data degradation management module that tracks a risk of data degradation by incrementing a track write counter of a first data track responsive to each data write command to a second data track, such as a data track directly adjacent to the first data track. If a count of the track write counter exceeds a count threshold, one or more post-write scan operations are performed to assess and/or repair data degradation of the first data track.

First claim

What is claimed is:

1. 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:
incrementing a track write counter of a first data track responsive to a data write command to a second data track but not incrementing any track write counters responsive to a data write to the first data track.

2. The tangible computer-readable storage media of claim 1 , wherein the computer process further comprises:
re-writing data of the first data track and data of at least one directly adjacent data track based on a count value of the track write counter.

3. The tangible computer-readable storage media of claim 1 , wherein the computer process further comprises:
reading the first data track if a count of the track write counter satisfies a count threshold; and
re-writing data of the first data track if a number of read errors detected during the reading of the first data track satisfies an error threshold.

4. The tangible computer-readable storage media of claim 1 , wherein the track write counter quantifies a risk of data degradation of the first data track.

5. The tangible computer-readable storage media of claim 1 , wherein the first data track is directly adjacent to the second data track.

6. The tangible computer-readable storage media of claim 2 , wherein re-writing the first data track and at least one directly adjacent data track further comprises:
re-writing data of data tracks directly adjacent to the first data track.

7. The tangible computer-readable storage media of claim 2 , wherein the computer process further comprises:
resetting the track write counter of the first data track to a default value.

8. A method comprising:
incrementing a first track write counter responsive to a data write to a first data track but not incrementing any track write counters responsive to a data write to a second data track directly adjacent to the first data track.

9. The method of claim 8 , wherein the method further comprises:
re-writing data of the first data track and data of the second data based on a count value of the first track write counter.

10. The method of claim 8 , wherein the method further comprises:
reading the first data track if a count of the track write counter satisfies a count threshold; and
re-writing data of the first data track if a number of read errors detected during the reading of the first data track satisfies an error threshold.

11. The method of claim 9 , further comprising:
resetting the track write counter of the first data track to a default value.

12. The method of claim 9 , further comprising:
incrementing a track write counter of a third data track and a track write counter for a fourth data track responsive to the re-write of data of the first data track, the second data track and the third data track each separated from the first data track by one interlaced data track.

13. A storage system comprising:
a degradation management module configured to increment a track write counter of a first data track responsive to a data write command to a second data track but not increment any track write counters responsive to a data write to a second data track directly adjacent to the first data track.

14. The storage system of claim 13 , further comprising:
a read/write management module coupled to a memory and configured to re-write data of the first data track and data of at least one data track directly adjacent to the first data track based on the value of the write track counter.

15. The storage system of claim 13 , wherein the first data track is directly adjacent to the second data track.

16. The storage system of claim 14 , wherein the degradation management module is further configured to reset the track write counter to a default value responsive to the re-write of data of the first data track.

17. The storage system of claim 14 , wherein the degradation management module is further configured to increase the track write counter of the first data track responsive to the re-write of the data of the at least one adjacent data track.

18. The storage system of claim 14 , wherein the degradation management module is further configured to increment a track write counter of a third data track and a track write counter for a fourth data track responsive to the re-write of the data of first data track, the third data track and the fourth data track each separated from the first data track by one interlaced data track.

19. The storage system of claim 14 , wherein the read/write management module re-writes data of the first data track before writing data of the at least one data track directly adjacent to the first data track.

Assignees

• Seagate Technology Llc

Inventors

• Gao Kaizhong
• Zhu Wenzhong
• Rausch Tim
• Gage Edward

Classifications

• G11B20/1833

  by adding special lists or symbols to the coded information (G11B20/1806, G11B20/1866 take precedence) · CPC title

• G11B2020/1292

  Enhancement of the total storage capacity · CPC title

• G11B20/1217

  on discs · CPC title

• G11B5/012

  Recording on, or reproducing or erasing from, magnetic disks (G11B17/00, G11B19/00 take precedence) · CPC title

• G11B2020/1238

  track, i.e. the entire a spirally or concentrically arranged path on which the recording marks are located · CPC title