Patent ID: 8014247

Claim:
A disk recording/reproducing apparatus, for recording or reproducing information onto an optical disk, with conducting an alternation process upon a defect block within a user data recording area on the optical disk, comprising: a disk rotator which rotates the optical disk; an optical pickup which irradiates a light upon a recording surface of the optical disk and which receives a reflection light thereof, so as to conduct recording or reproducing of data onto the recording surface of the optical disk; a slide motor which moves the optical pickup into a radial direction of the optical disk; and a controller which controls at least the disk rotator and the slide motor in accordance with a signal obtained from the optical pickup, wherein the controller determines an alternation destination for recording data at an alternation origin therein or during the alternation process depending on a position of the alternation origin on the optical disk and a reference position on the optical disk which is at a position other than a position of an alternation area on the optical disk, when the optical disk has an alternation area on an inner periphery and an outer periphery, and the recording/reproducing apparatus conducts the alternation process upon detection of a defect block within a user data recording area on the optical disk, thereby conducting the alternation process thereon.