STORAGE DEVICE, STORAGE SYSTEM AND METHOD OF VIRTUALIZING A STORAGE DEVICE

• US 20120311237A1
• Filed: 03/24/2012
• Published: 12/06/2012
• Est. Priority Date: 05/30/2011
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: PARK, Young-Jin
• Application Number:
  US13/429,329
• Publication Number:
  US 20120311237A1
• Time in Patent Office: Days
• US Class Current: 711/103
• CPC Class Codes: G06F 12/0246 in block erasable memory, e.g. flash memory
• CPC Class Codes: G06F 2212/7201 Logical to physical mapping or translation of blocks or pages
• CPC Class Codes: G06F 2212/7208 Multiple device management, e.g. distributing data over multiple flash devices

Abstract

A storage device includes a storage media including a one or more nonvolatile memories and a controller. The controller controls the nonvolatile memories, provides a virtual storage to an external host via at least one of the nonvolatile memories and erases a memory block of corresponding nonvolatile memory including data at physical addresses corresponding to data in the virtual storage.

Claims

1. A method of operating a solid state drive including a controller and a nonvolatile memory, the method comprising:

creating a virtual memory drive with the nonvolatile memory, the virtual memory drive comprising multiple physical addresses;

storing a computer file in the virtual memory drive at a first set of locations corresponding to a first set of the multiple physical addresses;

associating the first set of the multiple physical addresses to a single logical address in a table;

moving the computer file in the virtual memory drive to a second set of locations corresponding to a second set of the multiple physical addresses; and

associating the second set of the multiple physical addresses to the single logical address in the table.

2. The method of claim 1, wherein the multiple physical addresses have a sequential order,

wherein storing the computer file in the virtual memory drive comprises storing the computer file in a first sequence of parts;

and

wherein moving the computer file in the virtual memory drive comprises rearranging the first sequence of parts of the computer file to store the computer file in a second sequence of parts, the second sequence being different from the first sequence.

3. The method of claim 2, wherein the moving the computer file comprises moving only some of the parts of the computer file.

4. The method of claim 3, further comprising performing a garbage collection operation associated with those parts of the computer file which were moved.

5. The method of claim 4, further comprising generating an internal TRIM command by the controller for those parts of the computer file which were moved,

wherein the internal TRIM command is configured to cause the controller to erase the computer file during the garbage collection operation mode.

6. The method of claim 4, wherein the controller determines which parts of the computer file to move in order to free a block of NAND flash for an erase operation.

7. The method of claim 3, wherein the moving the computer file in the virtual drive memory comprises moving some of the parts of the computer file from a first block of NAND flash memory to a second block of NAND flash memory, and wherein the method further comprises:

erasing the first block of NAND flash memory.

8. The method of claim 8, further comprising:

rearranging the second sequence of parts of the computer file to store the computer file in a third sequence of parts, the third sequence being different from the second sequence.

9. The method of claim 9, wherein storing the computer file in a third sequence of parts comprises storing at least some of the parts of the computer file in the first block of NAND flash memory.

10. A storage device comprising:

a plurality of nonvolatile memories;

a controller configured to control the nonvolatile memories, configured to provide a virtual memory to an external host utilizing at least a first nonvolatile memory of the nonvolatile memories and configured to erase a first memory block of the first nonvolatile memory including first data stored in the virtual memory in response to a delete request of the first data stored in the virtual memory,

wherein the controller erases the first memory block of the first nonvolatile memory by generating an internal trim command in response to the delete request of the first data stored in the virtual memory.

11. The storage device of claim 10, wherein the controller is configured to generate a virtualization file table (VFT) to associate the first data in the virtual memory with a first set of physical addresses of memory locations storing the first data in the virtual memory.

12. The storage device of claim 11, wherein the VFT is stored in one of the nonvolatile memories.

13. The storage device of claim 11, wherein the VFT is stored in a volatile memory of the controller.

14. The storage device of claim 11, further comprising firmware including the controller configured by software, the firmware comprising:

a virtualization management module configured to generate the virtualization file table;

a flash address translator configured to convert logical addresses from the external host to physical addresses of the nonvolatile memories; and

a block management module configured to manage memory blocks of the nonvolatile memories,

wherein the block management module is configured to register a bad block address and to replace the bad block with a reserved block.

15. The storage device of claim 14, wherein the software of the firmware is stored in a ROM in communication with the controller.

16. The storage device of claim 11, wherein the controller is configured to erase the first memory block of the first nonvolatile memory in response to referencing the VFT, in response to the delete request of the first data in the virtual memory.

17. The storage device of claim 16, wherein the controller is configured to initiate the erase the first memory block of the first nonvolatile memory when the first nonvolatile memory is in an idle state.

18. The storage device of claim 16, wherein the controller is configured to delay initiation of the internal trim command until the first nonvolatile memory transitions to an idle state from a busy state.

19. The storage device of claim 16, wherein the controller is configured to initiate moving data of the first block of the first nonvolatile memory to a second memory block, and configured to erase the first memory block of the first nonvolatile memory after moving data in the first memory block to a second memory block, wherein all physical addresses of the second memory block not being associated with the virtual memory prior to initiating the moving of the data in the first memory block to the second memory block are erased.

20. A method of operating a solid state drive including a controller and a nonvolatile memory, the method comprising:

creating a virtual memory drive with the nonvolatile memory, the virtual memory drive having multiple logical addresses corresponding to multiple physical addresses;

storing a computer file in the virtual memory drive at a first set of the multiple physical addresses;

moving the computer file in the virtual memory drive to a second set of the multiple physical addresses; and

performing a garbage collection operation of the nonvolatile memory associated with at least a portion of the first set of multiple physical addresses corresponding to those parts of the computer file which were moved,

wherein storing the computer file in the virtual memory drive comprises storing the computer file in a first sequence of parts; and

generating an internal TRIM command by the controller for the nonvolatile memory associated with at least a portion of the first set of multiple physical addresses corresponding to those parts of the computer file which were moved;

wherein moving the computer file in the virtual memory drive comprises rearranging the first sequence of parts of the computer file to store the computer file in a second sequence of parts, the second sequence being different from the first sequence.