Data storage system with non-volatile memory and method of operation thereof

• US 8,935,466 B2
• Filed: 03/28/2012
• Issued: 01/13/2015
• Est. Priority Date: 03/28/2011
• Status: Expired due to Fees

• Current Assignee: SanDisk Technologies LLC (Western Digital Corporation)
• Original Assignee: Smart Storage Systems Incorporated (Western Digital Corporation)
• Inventors: Ellis, Robert W.
• Primary Examiner(s): Chery, Mardochee
• Assistant Examiner(s): Dewan, Kamal K
• Application Number:
  US13/433,090
• Publication Number:
  US 20120254519A1
• Time in Patent Office: 1,021 Days
• Field of Search: 711/106, 711/103, 711/112, 365/185
• US Class Current: 711/106
• CPC Class Codes: G06F 12/0246 in block erasable memory, e.g. flash memory
• CPC Class Codes: G06F 2212/7211 Wear leveling
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A method of operation of a data storage system includes: identifying a target block; configuring a command setting for maximizing a data retention period of the target block for refreshing the target block; writing a pre-archived memory block to the target block based on the command setting; and updating an archive status for sending to a host device.

Claims

1. A method of operation of a data storage system comprising:

receiving an archive command;

in response to receiving the archive command;

writing data from a pre-archived data block of the data storage system to a first target block of the data storage system in accordance with a first set of command settings, wherein the first target block comprises an archived data block of the data storage system,

updating an archive status of the pre-archived data block, and

sending the updated archive status to a host device; and

receiving a restore command;

in response to receiving the restore command;

writing data from the archived data block of the data storage system to a second target block of the data storage system in accordance with a second set of command settings distinct from the first set of command settings,

updating a restore status of the archived data block, and

sending the updated restore status to the host device.

2. The method of claim 1, wherein the restore command is triggered when the data storage system receives operating electrical power.

3. The method of claim 1, wherein the archive command and the restore command are received from the host device.

4. The method of claim 1, wherein the first set of command settings is configured to maximize data retention of the first target block.

5. The method of claim 1, wherein the second set of command settings is configured to maximize data endurance of the second target block.

6. The method of claim 1, further comprising writing data, during routine usage of the data storage system, in accordance with a third set of command settings, wherein the first, second, and third set of command settings are distinct from one another.

7. The method of claim 1, wherein writing data from the pre-archived data block includes writing data from the pre-archived data block to a fast page of the first target block.

8. The method of claim 1, wherein command settings include at least one setting selected from the group consisting of:

a storage temperature of the data storage system;

an error correction code level;

a duration or timing for writing to a respective target block;

one or more voltage levels for control signals used to read, store, and/or erase data in a respective target block;

a setting requiring single plane operation within a respective target block; and

a setting for writing the pre-archived data block equally across memory pages of a respective target block.

9. The method of claim 1, further comprising configuring the first set of command settings, wherein configuring includes selecting a modified error correction code level to compensate for an expected storage temperature of the data storage system.

10. The method of claim 1, further comprising:

erasing, in response to receiving the archive command, the first target block of the data storage system in accordance with the first set of command settings; and

erasing, in response to receiving the restore command, the second target block of the data storage system in accordance with the second set of command settings.

11. The method of claim 10, wherein command settings include at least one setting selected from a group consisting of:

a program erase cycle count, a program erase cycle count threshold, and a duration of an erase pulse for erasing a respective target block.

12. A data storage system comprising:

a memory array having a first target block and a second target block;

a control unit, coupled to the memory array, for configuring a first set of command settings and a second set of command settings distinct from the first set of command settings;

a memory interface, coupled to the memory array, for;

writing, in response to receiving an archive command, data from a pre-archived data block of the data storage system to the first target block of the data storage system in accordance with the first set of command settings, wherein the first target block comprises an archived data block of the data storage system, and

writing, in response to receiving a restore command, data from the archived data block of the data storage system to the second target block of the data storage system in accordance with the second set of command settings;

an error correction code unit, coupled to the control unit, for calculating an error correction code for the first target block and the second target block; and

a host interface, coupled to the control unit, for;

updating an archive status of the pre-archived data block and a restore status of the archived data block, and

sending the updated archive status and the updated restore status to a host device.

13. The data storage system of claim 12, wherein the restore command is triggered when the data storage system receives operating electrical power.

14. The data storage system of claim 12, wherein the archive command and the restore command are received from the host device.

15. The data storage system of claim 12, wherein the first set of command settings is configured to maximize data retention of the first target block.

16. The data storage system of claim 12, wherein the second set of command settings is configured to maximize data endurance of the second target block.

17. The data storage system of claim 12, wherein the memory interface is further for:

writing data, during routine usage of the data storage system, in accordance with a third set of command settings, wherein the first, second, and third set of command settings are distinct from one another.

18. The data storage system of claim 12, wherein writing the pre-archived data block includes writing the pre-archived data block to a fast page of the target block.

19. The data storage system of claim 12, wherein command settings include at least one setting selected from the group consisting of:

a storage temperature of the data storage system;

an error correction code level;

a duration or timing for writing to a respective target block;

one or more voltage levels for control signals used to read, store, and/or erase data in a respective target block;

a setting requiring single plane operation within a respective target block; and

a setting for writing the pre-archived data block equally across memory pages of a respective target block.

20. The data storage system of claim 12, wherein configuring a respective set of command settings includes selecting a modified error correction code level to compensate for an expected storage temperature of the data storage system.

21. The data storage system of claim 12, the memory interface further for:

erasing, in response to receiving the archive command, the first target block of the data storage system in accordance with the first set of command settings; and

erasing, in response to receiving the restore command, the second target block of the data storage system in accordance with the second set of command settings.

22. The data storage system of claim 21, wherein command settings include at least one setting selected from a group consisting of:

a program erase cycle count, a program erase cycle count threshold, and a duration of an erase pulse for erasing a respective target block.