Disk drive device and method for accessing disk thereof

A disk drive device comprising:

• a head for accessing a disk;
• a moving mechanism for moving the head above the disk;
• and
• a controller for sending data at a reassignment destination address retrieved with the head in response to a normal read command and sending data at a reassignment source address retrieved with the head in response to a predetermined read command, and performing data write operations to the reassignment destination address corresponding to the reassignment source address and the reassignment source address in response to a write command to the reassignment source address.

A disk drive device comprising:

• a head for accessing a disk;
• a moving mechanism for moving the head;
• and
• a controller for controlling the moving mechanism;
• wherein
• the controller retrieves data at a reassignment destination address using the head in response to a normal read command, and further determines whether to retrieve data at a reassignment source address or to retrieve data at a reassignment destination address based on the number of reassignment source addresses included in the addresses designated by a predetermined read command.