Binding shingled recording bands

• US 9,460,751 B2
• Filed: 09/16/2013
• Issued: 10/04/2016
• Est. Priority Date: 09/16/2013
• Status: Active Grant

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Feldman, Timothy R
• Primary Examiner(s): MERCEDES, DISMERY E
• Application Number:
  US14/028,399
• Publication Number:
  US 20160012850A1
• Time in Patent Office: 1,114 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G11B 20/1217 on discs
• CPC Class Codes: G11B 20/1258 where blocks are arranged within multiple radial zones, e.g. Zone Bit Recording or Constant Density Recording discs, MCAV discs, MCLV discs
• CPC Class Codes: G11B 20/1889 with discs
• CPC Class Codes: G11B 2020/1278 Physical format specifications of the record carrier, e.g. compliance with a specific standard, recording density, number of layers, start of data zone or lead-out
• CPC Class Codes: G11B 2020/1292 Enhancement of the total storage capacity
• CPC Class Codes: G11B 27/322 used signal is digitally coded

Abstract

Systems and methods are disclosed for binding shingled recording bands in data storage devices, particularly devices employing shingled magnetic recording. In one embodiment, an apparatus may comprise a controller configured to define boundaries of an area of a data storage medium based on a constraint and a list of defective sectors. In another embodiment, an apparatus may comprise a data storage device including a memory configured to store data in a shingled manner where one track partially overlaps an adjacent track, and a controller configured to define boundaries of a plurality of bands, each band including a plurality of tracks of the memory, based on the results of an error discovery scan for defective sectors of the memory.

Claims

1. An apparatus comprising:

a controller configured to;

perform a defect discovery scan on a data storage medium to determine defective sectors; and

define boundaries of a writable area of a band of the data storage medium based on defective sectors located in the band and a number of usable sectors of the band, the band including a plurality of shingled tracks of the data storage medium where one track partially overlaps an adjacent track, at least two of the plurality of shingled tracks having a different number of sectors per track.

2. The apparatus of claim 1 further comprising:

the controller further configured to define boundaries of the writable area by designating a first track and a last track.

3. The apparatus of claim 1 further comprising:

the constraint includes an amount of time to;

read data from the writable area;

modify the read data; and

write the modified data to the writable area.

4. The apparatus of claim 1 further comprising:

the constraint includes a selected number of non-defective data sectors in the writable area.

5. The apparatus of claim 4 further comprising:

the controller configured to;

define the boundaries of the writable area by designating at least one guard track to separate the writable area from other writable data sectors, the at least one guard tracks not being used to store user data.

6. The apparatus of claim 1 comprising the controller further configured to:

define boundaries of the writable area based on a first selected capacity; and

define boundaries of another writable area of a second shingled band of the data storage medium based on a second selected capacity different from the first selected capacity, the another writable area also configured to store data in a shingled manner.

7. The apparatus of claim 1 further comprising:

the controller further configured to perform the defect discovery scan on the data storage medium to obtain a list of the defective sectors prior to defining the boundaries of the writable area.

8. The apparatus of claim 7 further comprising:

the controller configured to format tracks on the data storage medium prior to performing the defect discovery scan.

9. The apparatus of claim 1 further comprising:

the data storage medium, configured into a plurality of zones each having a plurality of tracks, the tracks of each zone having a different number of sectors per track than the other zones; and

the controller further configured to define the boundaries of the writable area of the band so that the writable area includes tracks from two adjacent zones.

13. The method of claim 9 further comprising:

performing the defect discovery scan on the data storage medium to obtain a list of the defective sectors prior to defining boundaries of the writable area.

14. The method of claim 9 further comprising:

defining boundaries of the writable area further based on a logical data capacity selected by a user.

10. A method comprising:

formatting a data storage medium;

performing a defect discovery scan on the data storage medium to determine defective sectors; and

defining boundaries of a writable area of a band of the data storage medium based on a storage capacity constraint and a number of individual defective sectors located in the band, the band including a plurality tracks and configured so that each track of the band except the last track is partially overlapped by an adjacent track.

11. The method of claim 10 further comprising:

the storage capacity constraint includes a minimum number of non-defective data sectors in the writable area.

12. The method of claim 11 further comprising:

defining the boundaries of the writable area includes designating at least one guard track to separate the writable area from writable data sectors of the data storage medium outside the writable area, the at least one guard track not being used to store user data.

15. The method of claim 10 further comprising:

defining the boundaries of at least one band such that at least two of the plurality of shingled tracks include a different number of sectors per track.

16. An apparatus comprising:

a data storage device including;

a memory configured to store data in a shingled manner where one track partially overlaps an adjacent track;

a controller configured to;

perform an error discovery scan to determine defective sectors of the memory; and

define boundaries of writable areas of a plurality of bands, each band including a plurality of tracks of the memory, based on a number of individual defective sectors identified in the error discovery scan and at least one selected band constraint including a minimum number of usable data sectors.

17. The apparatus of claim 16 further comprising the controller configured to:

define the boundaries based on at least one selected band constraint including an amount of time to;

read data from the writable areas;

modify the read data; and

write the modified data to the writable areas.

18. The apparatus of claim 17 further comprising the controller configured to:

define guard tracks to separate each band in the plurality of bands from writable data sectors of adjacent bands, the guard tracks not being used to store user data; and

define the guard tracks to include defective data sectors located in a first track or last track of each band.

19. The apparatus of claim 16 further comprising:

the memory configured into a plurality of zones each having a plurality of tracks, the tracks of each zone having a different number of sectors per track than other zones of the plurality of zones; and

the controller further configured to define the boundaries of the writable area of at least one band from the plurality of bands so that the boundaries include tracks from two adjacent zones.

20. The apparatus of claim 16 further comprising:

the controller further configured to define boundaries of at least two bands from the plurality of bands to include different numbers of usable data sectors and different storage capacities.