Data processing method for solid state drive

A data processing method for a solid state drive, the solid state drive comprising a control circuit and a non-volatile memory, the control circuit comprising a logical-to-physical table, the non-volatile memory comprising plural blocks, the data processing method comprising steps of:

• when a data area of a data block of the plural blocks is fully occupied with a write data, performing a block-closing action on the data block, wherein after the block-closing action is completed, a close information corresponding to the data block is stored into an information area of the data block and the data block is recognized as a used block;
• when a trim command is received, judging whether the used block is changed to an unused block according to the trim command;
• and
• if the used block is changed to the unused block, storing the close information into a trim block of the plural blocks.