Memory device, electronic system, and methods associated with modifying data and a file of a memory device

• US 9,075,814 B2
• Filed: 02/18/2014
• Issued: 07/07/2015
• Est. Priority Date: 03/20/2007
• Status: Active Grant

• Current Assignee: Micron Technology, Inc.
• Original Assignee: Micron Technology, Inc.
• Inventors: Sepulveda, Frank J.
• Primary Examiner(s): Ahn, Sangwoo
• Application Number:
  US14/182,845
• Publication Number:
  US 20140164445A1
• Time in Patent Office: 504 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G06F 11/1441 Resetting or repowering
• CPC Class Codes: G06F 12/0246 in block erasable memory, e.g. flash memory
• CPC Class Codes: G06F 16/1727 Details of free space management performed by the file system saving storage space on storage systems G06F3/0608; management of blocks in storage devices G06F3/064
• CPC Class Codes: G06F 16/1847 specifically adapted to static storage, e.g. adapted to flash memory or SSD
• CPC Class Codes: G06F 16/1865 Transactional file systems
• CPC Class Codes: G06F 2212/1032 Reliability improvement, data loss prevention, degraded operation etc
• CPC Class Codes: G06F 2212/2022 Flash memory
• CPC Class Codes: G06F 3/0619 in relation to data integrity, e.g. data losses, bit errors
• CPC Class Codes: G06F 3/0643 Management of files
• CPC Class Codes: G06F 3/065 Replication mechanisms
• CPC Class Codes: G06F 3/0679 Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]

Abstract

A memory device, system and method of editing a file in a non-volatile memory device is described. The memory device includes a controller and a memory array configured to copy an existing first file into a second file during editing and to maintain the first file while applying edits to the second file. When editing is completed, a first cluster pointer of the first file is redirected to point at the first cluster of the second file that has been edited.

Claims

1. A method of modifying data in a memory device, comprising:

generating a modified file copy of an existing file within a file system of a memory device, the existing file having a first starting pointer associated therewith pointing to a first entry of a file allocation table, the modified file copy having a second starting pointer associated therewith pointing to a second entry of a file allocation table, wherein the first entry corresponds to data of the existing file, and the second entry corresponds to data of the modified file copy, and wherein the second starting pointer is generated regardless of whether the data of the modified file copy corresponding to the second entry is modified; and

reassociating the first starting pointer of the existing file to point to the second entry after completion of generating the modified file copy.

2. The method of claim 1, wherein the first entry of a file allocation table and the second entry of a file allocation table are located within a single file allocation table.

3. The method of claim 2, wherein the single file allocation table includes additional entries corresponding to additional data of the existing file and the modified file copy.

4. The method of claim 1, wherein generating the modified file copy includes creating a file copy and modifying the file copy.

5. The method of claim 4, wherein creating the file copy includes copying data clusters of the existing file and generating a new data cluster for each data cluster copied from the existing file.

6. The method of claim 5, wherein modifying the file copy includes at least one of editing, writing, programming, erasing, and resetting data in the file copy.

7. A method of modifying a file of a memory device, the method comprising:

generating a modified file copy of an existing file within a memory device, the existing file having a first starting pointer to a first location of a file allocation table corresponding to an initial data of the existing file, the modified file copy having a second starting pointer to a second location of a file allocation table corresponding to an initial data of the modified file copy; and

reassociating the first starting pointer to point to the second location while maintaining the second starting pointer to point to the second location at least until the first starting pointer has been reassociated to point to the second location regardless of whether the initial data of the modified file copy is modified.

8. The method of claim 7, wherein generating the modified file copy includes modifying a previously unmodified file copy of the existing file while the second starting pointer is being maintained to point to the second location, and prior to the first starting pointer being reassociated to the second location.

9. An apparatus, comprising:

a memory array partitioned according to a file system; and

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

generate a modified file copy of an existing file;

reassociate a first starting pointer from pointing to a first location of a file allocation table of the file system to point to a second location of a file allocation table after the modified file copy has been generated, wherein the first location corresponds to an initial data of the existing file, and the second location corresponds to an initial data of the modified file copy; and

maintain a second starting pointer to point to the second location prior to the first starting pointer being reassociated to point to the second location regardless of whether the initial data of the modified file copy is modified.

10. The apparatus of claim 9, wherein each partition of the memory array includes a system area and a data area.

11. The apparatus of claim 10, wherein the system area includes a plurality of segments including a root directory area and a file allocation table area.

12. The apparatus of claim 11, wherein the file allocation table area includes a single file allocation table that includes the first location and the second location.

13. The apparatus of claim 12, wherein the first location and the second location each include a next pointer to a next location of the single file allocation table.

14. The apparatus of claim 11, wherein the first starting pointer and the second starting pointer are stored in the root directory area.

15. The apparatus of claim 11, wherein the file allocation table area includes:

a first record identifying how the clusters making up the existing file are linked together; and

a second record identifying how the clusters making up the modified file copy are linked together.

16. The apparatus of claim 9, wherein the controller includes a control state machine.

17. The apparatus of claim 9, wherein the memory array is a Flash memory array.

18. The apparatus of claim 9, further comprising:

a memory device comprising the memory array and the controller; and

a host system operably coupled to the memory device, the host system configured to access the memory array to retrieve the data of the files of the file system.

19. The apparatus of claim 18, wherein the host system includes a processor.

20. The apparatus of claim 9, wherein the data includes at least one of a cluster, a sector, and a page according to a defined structure of the file system.