Data storage device and data maintenance method thereof

A data storage device, comprising:

• a flash memory, comprising a plurality of chips, each of the chips has a plurality of pages, the pages of each of the chips are arranged to be assembled into a super block according to a predetermined order, and each of the super blocks comprises the pages of the different chips;
• a plurality of counting control arrays, wherein each of the counting control arrays comprises a plurality of fields, each of the counting control arrays corresponds to one of the super blocks, and each of the fields corresponds to one of the chips;
• and
• a controller, reading a first counting control array of the plurality of counting control arrays corresponding to a first chip to obtain value of a first field corresponding to the first chip of the first counting control array when data of the first chip of a first super block is required to be read, wherein the controller keeps the value of the first field and writes a second value into the other fields except for the first field of the first counting control array when the value of the first field is a first value, and writes the first value into the first field and keeps the values of the other fields of the first counting control array when the value of the first field is the second value.

A data maintenance method, applied to a data storage device, wherein the data storage device has a plurality of chips, each of the chips comprises a plurality of pages, the pages of each of the chips are arranged to be assembled into a super block according to a predetermined order, and each of the super blocks comprise the pages of the different chips, the data maintenance method comprises:

• reading a first counting control array of a plurality of counting control arrays corresponding to a first super block to obtain value of a first field corresponding to a first chip of a plurality of fields of the first counting control array when data of the first chip corresponding to the first super block is required to be read, wherein each of the counting control arrays correspond to one of the super blocks, and each of the fields of the counting control arrays corresponds to one of the chip;
• keeping the value of the first field and writing a second value into the other fields except for the first field of the first counting control array when the value of the first field is a first value;
• and
• writing the first value into the first field and keeping values of the other field except for the first field of the first counting control array when the value of the first field is the second value.