Reader separation dependent linear and track density push for array reader based magnetic recording

Patent metadata

Field	Value
Publication number	US-9305595-B2
Application number	US-201414225409-A
Country	US
Kind code	B2
Filing date	Mar 25, 2014
Priority date	Feb 3, 2014
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

A method of operating a multi-reader two-dimensional magnetic recording system includes determining a position of a multi-reader head of the multi-reader two-dimensional magnetic recording system, determining an areal density push according to the position of the multi-reader head, and performing an operation to read data from or write data to a magnetic recording medium according to the areal density push.

First claim

What is claimed is:

1. A method of operating a multi-reader two-dimensional magnetic recording system, the method comprising: determining a position of a multi-reader head of the multi-reader two-dimensional magnetic recording system; determining an areal density push according to the position; and performing an operation to read data from or write data to a magnetic recording medium according to the areal density push.

2. The method of claim 1 , further comprising reading the areal density push data from a zone table of the multi-reader two-dimensional magnetic recording system.

3. The method of claim 2 , further comprising: providing a preliminary zone table entry of the zone table comprising a plurality of push dimensions corresponding to a plurality of zones of the magnetic recording medium; and modifying the preliminary zone table entry according to one or more dimensions of the multi-reader head.

4. The method of claim 1 , wherein the areal density push is a track push.

5. The method of claim 1 , wherein the areal density push is a bit push.

6. The method of claim 1 , wherein the position is a skew of the multi-reader head.

7. The method of claim 6 , further comprising determining a cross-track separation of a plurality of read-heads of the multi-reader head according to the skew.

8. The method of claim 1 , wherein the position is a zone of the magnetic recording medium over which the multi-reader head is disposed.

9. A multi-reader two-dimensional magnetic recording system, the system comprising: a multi-reader head; a device detecting a position of the multi-reader head; a memory device storing a zone table; and a read channel configured to select an areal density push for performing an operation to read data from a magnetic recording medium, the areal density push selected from the zone table corresponding to the position of the multi-reader head and a cross-track separation between read heads of the multi-reader head.

10. The multi-reader two-dimensional magnetic recording system of claim 9 , further comprising a motor controlling a rotation of the magnetic recording medium.

11. The multi-reader two-dimensional magnetic recording system of claim 9 , wherein the device detecting the position of the multi-reader head is a voice coil motor control module.

12. The multi-reader two-dimensional magnetic recording system of claim 9 , wherein the device detecting the position of the multi-reader head is a motor controller.

13. The multi-reader two-dimensional magnetic recording system of claim 9 , configured as a device in a redundant array of independent devices (RAID) system.

14. A computer program product embodied in a non-transitory machine-readable medium having machine-readable program code embodied thereon for performing a method of operating a multi-reader two-dimensional magnetic recording system, the method comprising: determining a position of a multi-reader head of the multi-reader two-dimensional magnetic recording system; determining an areal density push according to the position; and performing an operation to read data from or write data to a magnetic recording medium according to the areal density push.

15. The computer program product of claim 14 , further comprising reading the areal density push data from a zone table of the multi-reader two-dimensional magnetic recording system.

16. The computer program product of claim 15 , further comprising: providing a preliminary zone table entry of the zone table comprising a plurality of push dimensions corresponding to a plurality of zones of the magnetic recording medium; and modifying the preliminary zone table entry according to one or more dimensions of the multi-reader head.

17. The computer program product of claim 14 , wherein the areal density push is a track push.

18. The computer program product of claim 14 , wherein the areal density push is a bit push.

19. The computer program product of claim 14 , wherein the position is a skew of the multi-reader head.

20. The computer program product of claim 19 , further comprising determining a cross-track separation of a plurality of read-heads of the multi-reader head according to the skew.

21. The computer program product of claim 14 , wherein the position is a zone of the magnetic recording medium over which the multi-reader head is disposed.

22. A data storage system, comprising: a plurality of storage devices, wherein at least one of the plurality of storage devices comprises: a multi-reader head; a device detecting a position of the multi-reader head; a memory device storing a zone table; and a read channel configured to select an areal density push for performing an operation to read data from a magnetic recording medium, the areal density push selected from the zone table corresponding to the position of the multi-reader head and a cross-track separation between read heads of the multi-reader head.

23. The data storage system of claim 22 , wherein the at least one of the plurality of storage devices is configured as a device in a redundant array of independent devices (RAID) system.

24. The data storage system of claim 22 , wherein the data storage system is configured as a multi-reader two-dimensional magnetic recording system.

Assignees

• Lsi Corp
• Avago Technologies General Ip

Inventors

• Hwang Eui Seok
• Mathew George

Classifications

• G11B20/1217 Primary

  on discs · CPC title

• G11B27/36

  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)} · CPC title

• G11B20/10009

  Improvement or modification of read or write signals · CPC title