Cache transfer time mitigation

Patent metadata

Field	Value
Publication number	US-11243887-B2
Application number	US-202016802121-A
Country	US
Kind code	B2
Filing date	Feb 26, 2020
Priority date	Sep 29, 2017
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

In accordance with one implementation, a method for mitigating cache transfer time entails reading data into memory from at least two consecutive elliptical data tracks in a main store region of data storage and writing the data read from the at least two consecutive elliptical data tracks to a spiral data track within a cache storage region.

First claim

What is claimed is:

1. A method comprising:
determining a linear storage density capability of each of a plurality of transducer heads;
identifying a subset of the transducer heads for which the determined linear storage density capability satisfies a predetermined threshold; and
assembling a storage device to include the identified subset of the transducer heads, the storage device having a storage media with a cache region that is read/write accessible by a select transducer head having a highest linear storage density capability of the identified subset.

2. The method of claim 1 , further comprising:
selecting a physical location for the cache region prior to assembling the storage device, wherein assembling the storage device further comprises:
assembling the storage device with the select transducer head of the identified subset positioned to access the selected physical location.

3. The method of claim 1 , further comprising:
after assembling the storage device, identifying a storage area accessible by the select transducer head in the identified subset; and
selectively defining the cache region within the identified storage area.

4. The method of claim 1 , further comprising:
defining multiple cache storage areas, each of the multiple cache storage areas located within a storage region accessible by an associated transducer head of the identified subset.

5. The method of claim 1 , further comprising:
selectively defining the cache region in an outer diameter region of the storage media.

6. The method of claim 1 , wherein determining the linear storage density capability of each of the plurality of transducer heads further comprises:
testing a linear storage density capability of each of the plurality of transducer heads with respect to multiple different discrete regions of the storage media; and
defining the cache region within a select one of the multiple different discrete regions in which a highest linear storage density capability is observed.

7. The method of claim 1 , wherein determining the linear storage density capability of each of the plurality of transducer heads further comprises:
after assembling the storage device, testing a linear storage density capability of each respective transducer head of the plurality of transducer heads within a corresponding outer diameter region of a plurality of outer diameter regions on different disk surfaces; and
defining the cache region within a select one of the outer diameter regions in which a highest linear storage density capability is observed.

8. A storage device comprising:
a plurality of transducer heads each having a predetermined linear storage density capability, the plurality of transducer heads including an identified subset of transducer heads for which the predetermined linear storage density capability exceeds a defined threshold; and
a cache region that is read/write accessible by a select transducer head of the identified subset, the select transducer head having a highest linear storage density capability of the plurality of transducer heads.

9. The storage device of claim 8 , wherein the cache region is an outer diameter region of a storage media.

10. The storage device of claim 9 , further comprising:
multiple cache storage regions, each of the multiple cache storage regions located within a different discrete storage region accessible by an associated different transducer head of the identified subset.

11. The storage device of claim 10 , wherein the multiple cache storage regions are each located in an outer diameter region of a different surface of a storage media.

12. The storage of claim 8 , wherein the select transducer head demonstrates a higher linear storage density capability when accessing the cache region than when accessing other regions of a same surface of a storage media.

13. A method comprising:
determining a linear storage density capability of each of a plurality of transducer heads;
identifying a subset of the transducer heads for which the determined linear storage density capability satisfies a predetermined threshold;
assembling a storage device, the storage device having a storage media with multiple discrete cache regions, each of the multiple discrete cache regions being read/write accessible by a different transducer head of the identified subset.

14. The method of claim 13 , further comprising:
after assembling the storage device, testing a linear density storage capability of each of the transducer heads of the identified subset within multiple discrete regions of the storage media; and
defining the multiple discrete cache regions to coincide with the discrete regions for which a highest linear density storage capability is observed.

15. The method of claim 14 , wherein the multiple discrete cache regions are each located in an outer diameter region of a different surface of the storage media.

16. The method of claim 14 , wherein each of the multiple discrete cache regions is located on a different surface of the storage media.

17. The method of claim 14 , further comprising:
prior to assembling the storage device, selecting a physical location for each of the multiple discrete cache regions, wherein assembling the storage device further comprises assembling the storage device with the transducer heads of the identified subset each positioned to access a different one of the multiple discrete cache regions.

18. The method of claim 13 , wherein determining the linear storage density capability of each of the plurality of transducer heads further comprises:
determining the linear storage density capability of each of a plurality of transducer heads prior to assembling the storage device.

Assignees

• Seagate Technology Llc

Inventors

• Kowles Andrew Michael
• Liu Xiong
• Gaertner Mark
• Yang Kai
• Xie Wenxiang
• Lin jiangnan

Classifications

• G06F3/061 Primary

  Improving I/O performance · CPC title

• G06F3/0676

  Magnetic disk device · CPC title

• G06F12/0871 Primary

  Allocation or management of cache space · CPC title

• G06F2212/1024

  Latency reduction · CPC title

• G06F12/0866

  for peripheral storage systems, e.g. disk cache · CPC title