Patent ID: 7155640

Claim:
A hard disk drive (HDD) defect list searching method, comprising: checking whether a target track is on a non-defective track list when a command to access the target track is applied; obtaining defect information from the non-defective track list if the target track is on the non-defective track list; searching for a defect list if the target track is not on the non-defective track list and obtaining defect information, including the number of defects existing between a starting track of a zone where the target track belongs and the target track and the number of defects in the target track, from the defect list; and obtaining defect information on the target track and defect information on tracks ranging from the target track to a next defective track from the defect list and storing the defect information on the target track and the next defective track to the non-defective track list.