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(57) ABSTRACT A disc having an updatable defect management area used by an apparatus for managing defects on the disc, the disc including a user data area which includes user data, a spare area that is a Substitute area for a defect existing in the user data area, and an area in which are recorded an address of data that is last recorded in the user data area and an address of a replacement data recorded in the spare area. Accord ingly, the disc defect management method and apparatus are applicable to a recordable disc Such as a write-once disc while effectively using a defect management area of the disc.