Data storage device and data maintenance method thereof

1. A data storage device, comprising:

a flash memory, having a plurality of Single-Level Cell (SLC)-spare blocks, a plurality of TLC-data blocks, and a plurality of Triple-Level Cell (TLC)-spare blocks; and

a controller, equally distributing the TLC-data blocks into three regions, the regions have the same number of TLC-data blocks, the controller further receives a prewrite data sector and a logic address of the prewrite data sector, and obtains a first sub-prewrite data sector, a second sub-prewrite data sector and a third sub-prewrite data sector according to the prewrite data sector and the logic address, wherein in a first stage, the controller further determines a first TLC-data block corresponding to the logic address according to the logic address, defines the region that contains the first TLC-data block as a first region, and determines whether the first TLC-data block has valid data, wherein in a first state, when the first TLC-data block does not have valid data, the controller respectively selects a second TLC-data block and a third TLC-data block from the regions other than the first region according to the first TLC-data block, respectively writes the first sub-prewrite data sector, the second sub-prewrite data sector and the third sub-prewrite data sector into the first TLC-data block, the second TLC-data block and the third TLC-data block by a SLC storage mode, and maps the first TLC-data block, the second TLC-data block and the third TLC-data block to the logic address.

2. The data storage device as claimed in claim 1 , wherein total number of TLC-data blocks is N, each of the TLC-data blocks has an address, and the addresses of the TLC-data blocks are in sequence.

3. The data storage device as claimed in claim 2 , wherein the address of the first TLC-data block plus N/3 is equal to the address of the second TLC-data block, the address of the first TLC-data block plus (2N)/3 is equal to the addresses of the third TLC-data block.

4. The data storage device as claimed in claim 1 , wherein in a second stage, the controller further programs the data in the first TLC-data block, the second TLC-data block and the third TLC-data block into one of the TLC-spare blocks, wherein the controller selects a first TLC-spare block from the TLC-spare blocks to program the data of the first TLC-data block, the second TLC-data block and the third TLC-data block, which are mapped to the logic address, into the first TLC-spare block by a TLC storage mode, maps the first TLC-spare block to the logic address, and releases the first TLC-data block, the second TLC-data block and the third TLC-data block.

5. The data storage device as claimed in claim 4 , wherein the first stage is Production Phase, the second stage is Integration Phase after the first stage, and the data storage device goes through a high temperature soldering event between the first stage and the second stage.

6. The data storage device as claimed in claim 4 , wherein the step of programming the data in the first TLC-data block, the second TLC-data block and the third TLC-data block into the first TLC-spare block by the TLC storage mode is performed in the second stage and interlocked with a write operation indicated by a user command.

7. The data storage device as claimed in claim 1 , wherein in a second stage, the controller further receives an user-write-command, and determines whether a specific TLC-data block of a specific logic address indicated by the user-write-command has the prewrite data sector according to the user-write-command.

8. The data storage device as claimed in claim 7 , wherein when the specific TLC-data block has the prewrite data sector, the controller obtains a second logic address that maps to the specific TLC-data block corresponding to the specific logic address, selects a second TLC-spare block from the TLC-spare pool, programs data in the specific TLC-data block and the other two TLC-data blocks that are mapped to the second logic address into the second TLC-spare block by a TLC storage mode to release the specific TLC-data block and the other two TLC-data blocks that are mapped to the second logic address.

9. A data maintenance method, applied to a data storage device having a plurality of Single-Level Cell (SLC)-spare blocks, a plurality of Triple-Level Cell (TLC)-data blocks, and a plurality of TLC-spare blocks, the data maintenance method comprising:

receiving a prewrite data sector and a logic address of the prewrite data sector, and obtaining a first sub-prewrite data sector, a second sub-prewrite data sector and a third sub-prewrite data sector according to the prewrite data sector and the logic address;

writing a prewrite data sector into at least one of the TLC-data blocks according to the logic address in a first stage, wherein the step of writing the prewrite data sector into the at least one of the TLC-data blocks according to the logic address further comprises:

equally distributing the TLC-data blocks into three regions, wherein the regions have the same number of TLC-data blocks;

determining a first TLC-data block corresponding to the logic address according to the logic address, and defining the region that contains the first TLC-data block as a first region;

determining whether the first TLC-data block has valid data;

selecting a second TLC-data block and a third TLC-data block, respectively, from the regions other than the first region according to the first TLC-data block when the first TLC-data block does not have valid data;

respectively writing the first sub-prewrite data sector, the second sub-prewrite data sector and the third sub-prewrite data sector into the first TLC-data block, the second TLC-data block and the third TLC-data block by a SLC storage mode; and

mapping the first TLC-data block, the second TLC-data block and the third TLC-data block to the logic address.

10. The data maintenance method as claimed in claim 9 , wherein total number of TLC-data blocks is N, each of the TLC-data blocks has an address, and the addresses of the TLC-data blocks are in sequence.

11. The data maintenance method as claimed in claim 10 , wherein the address of the first TLC-data block plus N/3 is equal to the address of the second TLC-data block, the address of the first TLC-data block plus (2N)/3 is equal to the addresses of the third TLC-data block.

12. The data maintenance method as claimed in claim 9 , further comprising:

programming the data in the first TLC-data block, the second TLC-data block and the third TLC-data block into one of the TLC-spare blocks in a second stage, wherein the step of programming the data in the first TLC-data block, the second TLC-data block and the third TLC-data block into one of the TLC-spare blocks further comprises:

selecting a first TLC-spare block from the TLC-spare blocks;

programming the data of the first TLC-data block, the second TLC-data block and the third TLC-data block, which are mapped to the logic address, into the first TLC-spare block by a TLC storage mode;

mapping the first TLC-spare block to the logic address; and

releasing the first TLC-data block, the second TLC-data block and the third TLC-data block.

13. The data maintenance method as claimed in claim 12 , wherein the first stage is Production Phase, the second stage is Integration Phase after the first stage, and the data storage device goes through a high temperature soldering event between the first stage and the second stage.

14. The data maintenance method as claimed in claim 12 , wherein the step of programming the data in the first TLC-data block, the second TLC-data block and the third TLC-data block into the first TLC-spare block by the TLC storage mode is performed in the second stage and interlocked with a write operation indicated by a user command.

15. The data maintenance method as claimed in claim 9 , further comprising:

receiving an user-write-command in a second stage; and

determining whether a specific TLC-data block of a specific logic address indicated by the user-write-command has the prewrite data sector according to the user-write-command.

16. The data maintenance method as claimed in claim 15 , further comprising:

obtaining a second logic address that maps to the specific TLC-data block corresponding to the specific logic address when the specific TLC-data block has the prewrite data sector;

selecting a second TLC-spare block from the TLC-spare pool; and

programming data in the specific TLC-data block and the other two TLC-data blocks that are mapped to the second logic address into the second TLC-spare block by a TLC storage mode to release the specific TLC-data block and the other two TLC-data blocks that are mapped to the second logic address.