METHOD FOR REDUCING DATA ERROR WHEN FLASH MEMORY STORAGE DEVICE USING COPY BACK COMMAND

• US 20090210758A1
• Filed: 09/30/2008
• Published: 08/20/2009
• Est. Priority Date: 02/15/2008
• Status: Abandoned Application

• Current Assignee: Asmedia Technology Incorporated (ASUSTek Computer, Inc.)
• Original Assignee: Asmedia Technology Incorporated (ASUSTek Computer, Inc.)
• Inventors: Huang, Chun-Hao, Chen, Chia-Hsin, Liu, Ming-Che
• Application Number:
  US12/241,307
• Publication Number:
  US 20090210758A1
• Time in Patent Office: Days
• US Class Current: 714/718
• CPC Class Codes: G06F 11/1068 in sector programmable memories, e.g. flash disk G06F11/1072 takes precedence

Abstract

A method for a flash memory storage device to use a copy back command includes the following steps. The method includes the step of copying a data in a first block of a flash memory to a buffer outside the flash memory, checking if the data in the buffer is correct, and copying the data in the first block of the flash memory to a second block in the flash memory when the data in the buffer is correct.

Claims

1. A method for a flash memory storage device to use a copy back command, comprising:

copying a data in a first block of a flash memory to a buffer outside the flash memory;

checking whether the data in the buffer is correct; and

copying the data in the first block of the flash memory to a second block in the flash memory when the data in the buffer is correct.

2. The method according to claim 1, wherein when the data in the buffer is incorrect, the data in the buffer is processed by an error correction processing to generate a corrected data, then the corrected data is copied to the second block in the flash memory.

3. The method according to claim 1, wherein the step of checking whether the data in the buffer is correct is checking according to a Hamming code correction rule.

4. The method according to claim 1, wherein the step of checking whether the data in the buffer is correct is checking according to a Reed Solomon code correction rule.

5. A flash memory storage device using a copy back command, comprising:

a control circuit having a buffer and an error correcting code (ECC) unit; and

a flash memory connected to the control circuit;

wherein the control unit copies a data in a first block of the flash memory to the buffer, and when the ECC unit checks that the data in the buffer is correct, the control unit sends a copy back command to the flash memory to copy the data in the first block of the flash memory to a second block of the flash memory.

6. The flash memory storage device using the copy back command according to claim 5, wherein when the ECC unit detects the data in the buffer is incorrect, the control circuit processes the data in the buffer by an error correction processing to generate a corrected data, then the corrected date is copied to the second block of the flash memory.

7. The flash memory storage device using the copy back command according to claim 5, wherein the control circuit is connected to the flash memory with an internal bus.

8. The flash memory storage device using the copy back command according to claim 5, wherein the ECC unit checks whether the data in the buffer is correct according to a Hamming code correction rule.

9. The flash memory storage device using the copy back command according to claim 5, wherein the ECC unit checks whether the data in the buffer is correct according to a Reed Solomon code correction rule.