Patent ID: 7015836

Claim:
An Eight to Fourteen Modulation (EFM) decoding method for an optical disk system, comprising: receiving a data series; extracting a first data coded with a first bit format from the data series; and looking up a corrected EFM decoding table for transforming the first data into a second data coded with a second bit format, wherein the corrected EFM decoding table comprises format transforming information for transforming data not complying with the EFM modulation criteria; looking up an expanded decoding table when the second data corresponding to the first data is not found in the corrected EFM decoding table for transforming the first data to the second data coded with the second bit format, wherein the expanded decoding table comprises the second data corresponding to portion of the first data that complies with the EFM modulation criteria but not complies with the corrected EFM decoding table; and outputting the second data.