Method and system for buffering data file to buffer memory

A system for reading audio data file with a plurality of blocks in an optical storage medium, and buffering the audio data file to a buffer memory, wherein each block is divided into a subcode block with a subcode and a corresponding main data block with main data, the system comprising following elements:

• an optical storage device connected to a computer host and receiving a reading command from the computer host;
• an address control unit, used for designating a starting block where buffering starts, decoding the blocks after the starting block to obtain the subcodes in the subcode blocks, and searching for the starting block in the blocks of the optical storage medium;
• a subcode buffer controller, used for continuously proceeding decoding of the subcodes, after the starting block is searched, to correspondingly decode the subcode block in the blocks after the starting block, and sequentially buffering the decoded subcodes, after decoding performed, respectively in a plurality of corresponding buffer units in the buffer memory;
• and
• a main data buffer controller, used for proceeding decoding of main data, after the starting block is searched, correspondingly decode the main data blocks in the starting block and the blocks thereafter, and sequentially buffering the decoded audio data respectively in the corresponding buffer units of the buffer memory;
• wherein the optical storage gets a number of blocks between the subcodes and the audio data stored in the buffer memory, and the optical storage device counts the number of blocks back from the target block to decide the starting block.