STORAGE DRIVE AND METHOD OF EXECUTING A COMPARE COMMAND

• US 20190004975A1
• Filed: 06/20/2018
• Published: 01/03/2019
• Est. Priority Date: 06/28/2017
• 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: BENISTY, Shay
• Granted Patent: US 10,642,758 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 12/0246 in block erasable memory, e.g. flash memory
• CPC Class Codes: G06F 12/0806 Multiuser, multiprocessor or multiprocessing cache systems
• CPC Class Codes: G06F 12/1458 by checking the subject access rights
• CPC Class Codes: G06F 2212/1052 Security improvement
• CPC Class Codes: G06F 2212/7203 Temporary buffering, e.g. using volatile buffer or dedicated buffer blocks

Abstract

A data storage device includes a memory and a controller coupled to the memory. The controller is configured to receive a compare command from a host, fetch or generate protection information from the host, fetch protection information from the memory, compare the protection information from the host and from the memory, and post a failure notice to the host when the protection information from the host and from the memory do not match. If the protection information from the host and from the memory does match, the controller is further configured to compare data fetched from the host and data fetched from the memory, and post a success notice to the host when both the protection information from the host and the memory match and the data from the host and the memory match.

Claims

1. A data storage device, comprising:

a memory comprising a non-volatile memory and one or more cache buffers;

a controller coupled to the memory, the controller configured to;

receive a compare command from a host;

fetch protection information from the host;

fetch protection information from the memory;

compare the protection information from the host and the protection information from the memory; and

post a failure notice to the host when the protection information from the host and the protection from the memory do not match.

2. The data storage device of claim 1, wherein the protection information from the host and the protection information from the memory are fetched in parallel.

3. The data storage device of claim 1, wherein the protection information from the memory is fetched from the non-volatile memory.

4. The data storage device of claim 1, wherein the protection information from the memory is fetched from the one or more cache buffers.

5. The data storage device of claim 1, wherein the controller is further configured to determine whether protection information is enabled.

6. The data storage device of claim 1, further comprising a host interface coupled to the controller.

7. A data storage device, comprising:

a memory comprising a non-volatile memory and a cache buffer;

a controller coupled to the memory, the controller configured to;

receive a compare command from a host;

compare protection information received from the host and protection information received from the memory;

determine that the protection information received from the host and the protection information received from the memory match; and

post a success notice to the host.

8. The data storage device of claim 7, wherein the protection information received from the host is generated based on data fetched from the host when protection information is disabled.

9. The data storage device of claim 7, wherein the protection information received from the host is fetched from the host when protection information is enabled.

10. The data storage device of claim 7, wherein the controller is further configured to compare data fetched from the host and data fetched from the memory prior to posting the success notice to the host.

11. The data storage device of claim 10, wherein the controller is further configured to determine that the data fetched from the host and the data fetched from the memory match prior to posting the success notice to the host.

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

fetching protection formation from a memory of the data storage device;

fetching data from a host;

generating protection information based on the data fetched from the host;

comparing the generated protection information and the fetched protection information; and

posting a failure notice to the host when the generated protection information and the fetched protection information do not match.

13. The method of claim 12, wherein the protection information from the data storage device and the data from the host are fetched in parallel.

14. The method of claim 12, further comprising determining protection information is disabled before generating the generated protection information.

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

receiving a compare command;

determining protection information is enabled;

fetching protection information from a host and from a memory in parallel;

comparing the protection information from the host and the protection information from the memory;

fetching data from the host and from the memory in parallel;

comparing the fetched data from the host to the fetched data from the memory; and

posting a failure notice to the host when the protection information from the host and the protection information from the memory match, and the data from the host and the data from the memory do not match.

16. The method of claim 15, wherein the memory comprises a non-volatile memory, and the data from the memory is fetched from the non-volatile memory.

17. The method of claim 15, wherein the memory comprises a cache buffer, and the data from the memory is fetched from the cache buffer.

18. The method of claim 15, further comprising determining the protection information from the host matches the protection information from the memory before fetching the data from the host and the data from the memory.

19. The method of claim 15, wherein the fetching of the protection information from the host and from the memory occurs at a faster speed than the fetching of the data from the host and from the memory.

20. The method of claim 15, wherein the protection information fetched from the memory is proportionally smaller in size than the data fetched from the memory, and the protection information fetched from the host is proportionally smaller in size than the data fetched from the host.

21. A data storage device, comprising:

a non-volatile memory;

means for fetching protection information from the non-volatile memory;

means for fetching protection information from a host;

means for calculating protection information based on data fetched from the host;

means for determining whether the protection information from the host and from the non-volatile memory match; and

means for fetching data from the non-volatile memory when the protection information from the host and the protection information from the non-volatile memory are determined to match.

22. The data storage device of claim 21, further comprising one or more processors.

23. The data storage device of claim 21, further comprising a memory interface coupled to the non-volatile memory.

24. The data storage device of claim 21, further comprising a command parser.

25. The data storage device of claim 21, further comprising means for posting a failure notice to the host when the protection information from the host and the protection information from the non-volatile memory are determined not to match.