Method and apparatus for checking compressed data errors

摘要

Double error correction is attempted on the data for which error detection is once performed on compressed data both in the error detecting circuit and in the error correcting circuit after it is read out in sectors from the target disc medium and the reliability of the data recorded on the disc medium is judged according to the pointer C2PO indicating that the error cannot be corrected even with the double correction processing, whereby a disc playback apparatus can be provided which is able to judge the state of data errors without executing the expanding processing of the compressed data.