METHOD FOR RESTORING AND MAINTAINING SOLID-STATE DRIVE PERFORMANCE

• US 20110119462A1
• Filed: 11/12/2010
• Published: 05/19/2011
• Est. Priority Date: 11/19/2009
• Status: Abandoned Application

• Current Assignee: OCZ Storage Solutions Incorporated (Toshiba Corporation)
• Original Assignee: OCZ Technology Group, Inc. (Toshiba Corporation)
• Inventors: Leach, Anthony, Schuette, Franz Michael
• Application Number:
  US12/945,100
• Publication Number:
  US 20110119462A1
• Time in Patent Office: Days
• US Class Current: 711/166
• CPC Class Codes: G06F 12/0246 in block erasable memory, e.g. flash memory
• CPC Class Codes: G06F 2212/7205 Cleaning, compaction, garbage collection, erase control
• CPC Class Codes: G11C 29/765 in solid state disks

Abstract

A method of maintaining a solid-state drive so that free space within memory blocks of the drive becomes free usable space to the drive. The drive comprises cells organized in pages that are organized in memory blocks in which at least user files are stored. A defragmentation utility is executed to cause at least some of the memory blocks that are partially filled with data and contain file fragments to be combined or aligned and to cause at least some of the memory blocks that contain only invalid data to be combined or aligned. A block consolidation utility is then executed to eliminate at least some of the partially-filled blocks by consolidating the file fragments into a fewer number of the memory blocks. The consolidation utility also increases the number of memory blocks that contain only invalid memory. All of the memory blocks containing only invalid data are then erased.

Claims

1. A method of increasing a performance level of a solid-state drive having at least one solid-state memory device and comprising cells organized in pages that are organized in memory blocks in which are stored user files and/or system files of an operating system for the solid-state drive, the method comprising:

executing a defragmentation utility to cause at least some of the memory blocks that are partially filled with data and contain file fragments to be combined or aligned and to cause at least some of the memory blocks that contain only invalid data to be combined or aligned;

executing a block consolidation utility to free-up at least some of the partially-filled blocks by consolidating the file fragments of at least some of the partially-filled blocks into a fewer number of the memory blocks, the block consolidation utility increasing the number of memory blocks that contain only invalid data; and

then erasing all of the memory blocks that contain only invalid data to yield free blocks having free usable space for use by the solid-state drive.

2. The method of claim 1, further comprising the step of deleting at least some of the user files to create at least some of the memory blocks that contain only invalid data.

3. The method of claim 1, further comprising the step of archiving at least some of the user files onto a second drive to create at least some of the memory blocks that contain only invalid data.

4. The method of claim 3, wherein the archiving step comprises prompting a user for permission to archive some of the user files.

5. The method of claim 1, wherein at least some of the memory blocks are fully used and the step of executing the defragmentation utility causes at least some of the fully-used memory blocks to be combined or aligned.

6. The method of claim 1, wherein the step of executing the block consolidation utility creates memory blocks that do not contain valid data.

7. The method of claim 1, further comprising writing data to at least one of the memory blocks erased by the erasing step.

8. The method of claim 1, wherein all of the steps recited in claim 1 are executed by an executable program running on a host system to which the solid-state memory device is connected.

9. The method of claim 1, wherein the solid-state memory components are NAND flash memory components.

19. The method of claim 10, wherein all of the steps recited in claim 1 are executed by an executable program running on a host system to which the solid-state memory device is connected.

21. A host system to which the solid-state memory device is connected and having means for performing the steps of claim 1.

10. A method of increasing a performance level of a solid-state drive having at least one solid-state memory device and comprising cells organized in pages that are organized in memory blocks in which user files and system files of an operating system for the solid-state drive are stored, the method comprising:

analyzing the solid-state drive to identify the system files and the user files stored in the memory blocks and group the user files into at least higher frequency-accessed user files and lower frequency-accessed user files;

removing the lower frequency-accessed user files so that the higher-frequency accessed user files remain stored in the memory blocks, at least some of the higher-frequency accessed user files being stored in partially-used memory blocks of the memory blocks, and the removing of the lower frequency-accessed user files causes at least some of the memory blocks to contain only invalid data;

executing a defragmentation utility to cause at least some of the partially-used blocks containing file fragments to be combined or aligned and to cause at least some of the memory blocks that contain only invalid data to be combined or aligned;

executing a block consolidation utility to eliminate at least some of the partially-used blocks by consolidating the file fragments of at least some of the partially-used blocks into a fewer number of the memory blocks, the block consolidation utility increasing the number of memory blocks that contain only invalid memory; and

then

erasing all of the memory blocks that contain only invalid data to yield free blocks having free usable space for use by the solid-state drive.

11. The method of claim 10, wherein the analysis step is performed according to a schedule defined with a host system to which the solid-state memory device is connected.

12. The method of claim 10, wherein the removing step comprises deleting at least some of the lower frequency-accessed user files and/or archiving at least some of the lower frequency-accessed user files onto a second drive.

13. The method of claim 10, wherein the removing step comprises deleting at least some of the lower frequency-accessed user files.

14. The method of claim 10, wherein the removing step comprises archiving at least some of the lower frequency-accessed user files onto a second drive.

15. The method of claim 14, wherein the archiving step comprises prompting a user for permission to archive the lower frequency-accessed user files.

16. The method of claim 10, wherein at least some of the memory blocks are fully used and the step of executing the defragmentation utility causes at least some of the fully-used memory blocks to be combined or aligned.

17. The method of claim 10, wherein the step of executing the block consolidation utility creates memory blocks that do not contain data.

18. The method of claim 10, further comprising writing data to at least one of the memory blocks erased by the erasing step.

20. The method of claim 10, wherein the solid-state memory components are NAND flash memory components.

22. A host system to which the solid-state memory device is connected and having means for performing the steps of claim 10.