Importance

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Abstract

An optical information recording and reproducing apparatus irradiates a laser beam to an optical disk for repeatedly recording and reproducing data on and from data sectors of the optical disk. The optical disk comprises a plurality of track blocks each comprising data sectors for recording data thereon, alternate sectors for substituting defective ones of the data sectors, and at least one mapping sector for recording mapping data representing the address correspondence between the defective sectors and the alternate sectors substituting the defective sectors. The optical information recording and reproducing apparatus comprises a recording and reproducing circuit for recording and reproducing data on and from the data sectors, an error control circuit for correcting an error occurred in any one of data, a defective sector detecting circuit for detecting a defective sector, a memory for storing mapping data, and a sector substituting circuit for substituting a defective sector by one of the alternate sectors. Mapping data representing the correspondence between the address information of the defective sector and that of the alternate sector substituting the defective sector is recorded on the mapping sector in the same block, and, at the time of data reproduction or data re-writing, the address information of the alternate sector is detected from the mapping sector of the block to which the alternate sector belongs, so that the data can be reproduced from or re-written on the alternate sector at a high speed.

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First Claim