Data storage device writing a multi-sector codeword in segments over multiple disk revolutions

• US 8,908,311 B1
• Filed: 02/06/2014
• Issued: 12/09/2014
• Est. Priority Date: 01/27/2014
• 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: Vasquez, Steven R.
• Primary Examiner(s): Young, Wayne
• Assistant Examiner(s): Fischer, Mark
• Application Number:
  US14/173,895
• Time in Patent Office: 306 Days
• Field of Search: None
• US Class Current: 360/51
• CPC Class Codes: G11B 20/1217 on discs
• CPC Class Codes: G11B 2020/1232 sector, i.e. the minimal addressable physical data unit

Abstract

A data storage device is disclosed comprising a head actuated over a disk comprising a plurality of data sectors. During a first revolution of the disk, write data is first encoded into a codeword spanning at least a first data sector and a second data sector and a first part of the codeword is written to the first data sector. During a second revolution of the disk, the write data is second encoded into the codeword and a second part of the codeword is written to the second data sector.

Claims

1. A data storage device comprising:

a disk comprising a plurality of data sectors;

a head actuated over the disk; and

control circuitry configured to;

during a first revolution of the disk, first encode write data into a codeword spanning at least a first data sector and a second data sector and write a first part of the codeword to the first data sector; and

during a second revolution of the disk, second encode the write data into the codeword and write a second part of the codeword to the second data sector.

2. The data storage device as recited in claim 1, wherein during the first revolution of the disk the control circuitry is configured to disable writing the second part of the codeword to the second data sector.

3. The data storage device as recited in claim 2, wherein the control circuitry is further configured to disable the writing due to a detected off-track condition.

4. The data storage device as recited in claim 2, wherein the control circuitry is further configured to disable the writing by disabling a write gate.

5. The data storage device as recited in claim 1, wherein during the first revolution of the disk the control circuitry is further configured to:

first encode the write data into the codeword spanning at least the first data sector, the second data sector, a third data sector and a fourth data sector; and

write a third part of the codeword to the third data sector following the second data sector.

6. The data storage device as recited in claim 5, wherein during a third revolution of the disk the control circuitry is further configured to:

third encode the write data into the codeword; and

write a fourth part of the codeword to the fourth data sector.

7. The data storage device as recited in claim 1, wherein the control circuitry is further configured to:

store the write data in a buffer, including the write data for the first and second data sector;

during the first revolution of the disk, transfer the write data for the first and second data sector from the buffer to an encoder configured to encode the write data into the codeword; and

during the second revolution of the disk, transfer the write data for the first and second data sector from the buffer to the encoder configured to encode the write data into the codeword.

8. A method of operating a data storage device, the method comprising:

during a first revolution of a disk, first encoding write data into a codeword spanning at least a first data sector and a second data sector and writing a first part of the codeword to the first data sector; and

during a second revolution of the disk, second encoding the write data into the codeword and writing a second part of the codeword to the second data sector.

9. The method as recited in claim 8, wherein during the first revolution of the disk further comprising disabling the writing of the second part of the codeword to the second data sector.

10. The method as recited in claim 9, further comprising disabling the writing due to a detected off-track condition.

11. The method as recited in claim 9, further comprising disabling the writing by disabling a write gate.

12. The method as recited in claim 8, wherein during the first revolution of the disk further comprising:

first encoding the write data into the codeword spanning at least the first data sector, the second data sector, a third data sector and a fourth data sector; and

writing a third part of the codeword to the third data sector following the second data sector.

13. The method as recited in claim 12, wherein during a third revolution of the disk further comprising:

third encoding the write data into the codeword; and

writing a fourth part of the codeword to the fourth data sector.

14. The method as recited in claim 8, further comprising:

storing the write data in a buffer, including the write data for the first and second data sector;

during the first revolution of the disk, transferring the write data for the first and second data sector from the buffer to an encoder configured to encode the write data into the codeword; and

during the second revolution of the disk, transferring the write data for the first and second data sector from the buffer to the encoder configured to encode the write data into the codeword.

15. Control circuitry configured to:

during a first revolution of a disk comprising a plurality of data sectors, first encode write data into a codeword spanning at least a first data sector and a second data sector and cause a head for the disk to write a first part of the codeword to the first data sector; and

during a second revolution of the disk, second encode the write data into the codeword and cause a head for the disk to write a second part of the codeword to the second data sector.

16. The control circuitry as recited in claim 15, wherein during the first revolution of the disk the control circuitry is configured to disable writing the second part of the codeword to the second data sector.

17. The control circuitry as recited in claim 16, wherein the control circuitry is further configured to disable the writing due to a detected off-track condition.

18. The control circuitry as recited in claim 16, wherein the control circuitry is further configured to disable the writing by disabling a write gate.

19. The control circuitry as recited in claim 15, wherein during the first revolution of the disk the control circuitry is further configured to:

first encode the write data into the codeword spanning at least the first data sector, the second data sector, a third data sector and a fourth data sector; and

cause the head to write a third part of the codeword to the third data sector following the second data sector.

20. The control circuitry as recited in claim 19, wherein during a third revolution of the disk the control circuitry is further configured to:

third encode the write data into the codeword; and

cause the head to write a fourth part of the codeword to the fourth data sector.

21. The control circuitry as recited in claim 15, wherein the control circuitry is further configured to:

store the write data in a buffer, including the write data for the first and second data sector;

during the first revolution of the disk, transfer the write data for the first and second data sector from the buffer to an encoder configured to encode the write data into the codeword; and

during the second revolution of the disk, transfer the write data for the first and second data sector from the buffer to the encoder configured to encode the write data into the codeword.