Variable spares per track defect management system

摘要

A defective track management method is provided for managing defective tracks in a disc drive where the logical zone table is generated after the drive certification test which determines the defect distribution; allocating sectors to achieve a constant number of sectors per track for a particular logical zone in the logical zone table wherein some sectors may be spare sectors allocated efficiently to avoid under sparing or over sparing, as the defect distribution on the disc drive has already been determined; and reassigning defective sectors to the spare sectors corresponding to the track or cylinder where the defective sector is located. The present invention also can be implemented as a defective track management system on a disk drive.