Defect scanning for a disk drive

• US 8,749,905 B1
• Filed: 03/07/2012
• Issued: 06/10/2014
• Est. Priority Date: 03/07/2012
• 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: Malina, James N.
• Primary Examiner(s): Edun, Muhammad N
• Application Number:
  US13/414,008
• Time in Patent Office: 825 Days
• Field of Search: None
• US Class Current: 360/31
• CPC Class Codes: G11B 20/1816 Testing
• CPC Class Codes: G11B 20/1889 with discs
• CPC Class Codes: G11B 2220/2508 Magnetic discs
• CPC Class Codes: G11B 27/36 Monitoring, i.e. supervising the progress of recording or reproducing for digital recording G11B20/00 and s.gr.; for monitoring, testing or measuring of TV recorders of the type covered by H04N5/76 and subgroups, see H04N17/06

Abstract

Apparatus and methods for performing defect scanning on a disk drive which includes a disk constructed to have tracks written on the disk for storing data. Test data is concurrently written in more than one track on the disk and the data written to the more than one track is read to detect defects on the disk.

Claims

1. A disk drive comprising:

a disk constructed to have a plurality of tracks on the disk for storing data;

a head including a write element constructed to concurrently write data in more than one track on the disk and a read element constructed to read data written in tracks on the disk; and

a controller configured to;

control the write element to write test data concurrently in more than one track on the disk; and

control the read element to read data written in the more than one track to detect defects on the disk.

2. The disk drive of claim 1, wherein the write element is a shingled magnetic recording element.

3. The disk drive of claim 1, wherein the more than one track is in an area of the disk designated as a shingled zone for overlapping tracks.

4. The disk drive of claim 1, wherein at least some tracks on the disk include a plurality of sectors for storing data.

5. The disk drive of claim 4, wherein the first sectors written in a first group of concurrently written tracks are offset by a track skew from the first sectors written in a second group of concurrently written tracks.

6. The disk drive of claim 4, wherein the read element is configured to read data written in each of the tracks in a concurrently written group of tracks such that within the group, a first sector read of a next track is offset by an integer number of logical sectors greater than a track skew from a first sector read of a previous track.

7. A defect scanning method for a disk drive, wherein the disk drive includes a disk constructed to have a plurality of tracks on the disk for storing data, the method comprising:

concurrently writing test data in more than one track on the disk using a head of the disk drive; and

reading data written in the more than one track to detect defects on the disk.

8. The defect scanning method of claim 7, wherein the test data is concurrently written in the more than one track by a shingled magnetic recording element of the head.

9. The defect scanning method of claim 7, wherein the more than one track is in an area of the disk designated as a shingled zone for overlapping tracks.

10. The defect scanning method of claim 7, wherein at least some tracks on the disk include a plurality of sectors for storing data.

11. The defect scanning method of claim 10, wherein the first sectors written in a first group of concurrently written tracks are offset by a track skew from the first sectors written in a second group of concurrently written tracks.

12. The defect scanning method of claim 10, wherein data is read from each of the tracks in a concurrently written group of tracks such that within the group, a first sector read of a next track is offset by an integer number of logical sectors greater than a track skew from a first sector read of a previous track.

13. A defect scanning method for a disk drive, wherein the disk drive includes a disk constructed to have a plurality of tracks on the disk for storing data, the method comprising:

receiving a defect scan command and test data from a test system;

concurrently writing the test data in more than one track on the disk using a head of the disk drive;

reading data written in the more than one track to detect defects on the disk;

creating defect mapping data based on errors detected in reading the data written in the more than one track; and

sending the defect mapping data to the test system.

14. The defect scanning method of claim 13, wherein the test data is concurrently written in more than one track by a shingled magnetic recording element of the head.

15. The defect scanning method of claim 13, wherein the more than one track is in an area of the disk designated as a shingled zone for overlapping tracks.

16. The defect scanning method of claim 13, wherein at least some tracks on the disk include a plurality of sectors for storing data.

17. The defect scanning method of claim 16, wherein the first sectors written in a first group of concurrently written tracks are offset by a track skew from the first sectors written in a second group of concurrently written tracks.

18. The defect scanning method of claim 16, wherein data is read from each of the tracks in a concurrently written group of tracks such that within the group, a first sector read of a next track is offset by an integer number of logical sectors greater than a track skew from a first sector read of a previous track.

19. A test system for performing defect scanning on a disk drive, wherein the disk drive includes a disk constructed to have a plurality of tracks for storing data, the test system comprising:

a memory storing test data;

a processor configured to create a defect scan command for the disk drive so that the test data is concurrently written to more than one track on the disk using a head of the disk drive and so that the data written in the more than one track is read by the disk drive to detect defects on the disk; and

a disk drive interface to send the defect scan command and test data to the disk drive.

20. The test system of claim 19, wherein the processor designates an area of the disk as a shingled zone for overlapping tracks and the more than one track is in the shingled zone.