Patent ID: 6842522
Filing Date: 2005-01-11
Classification: G11B

Abstract:
1. A method for reading and decoding data from an optical medium recorded according to a proprietary format based on a predetermined ECMA (European Computer Manufacturer's Association) standard, comprising: reading channel bits from the optical medium; removing sync codes from the channel bits to derive a plurality of ESM (eight-to-sixteen modulation)-encoded words; decoding the ESM-encoded words to generate a plurality of recording frames; rearranging the recording frames to generate an ECC (Error Correcting/Correction Code) block; removing parity bytes from the ECC block to generate a plurality or scrambled data frames; descrambling the scrambled data frames to generate a plurality of encoded data frames; inverting at least one selected bit at a predetermined location of each encoded data frame to generate a plurality of data frames, wherein only after inverting each data frame including the inverted bit has a correct or valid value according to the predetermined ECMA standard; and extracting main data from the plurality of data frames.