US Patent 7624328 Data error detection during media write

Data error detection comprises storing in a first buffer data to be written to a medium and a first digital signature of the data. If the first digital signature matches a second digital signature of data read from the first buffer, a compressed form of data read from the first buffer is stored in a FIFO. If the first digital signature matches a third digital signature of an uncompressed form of the compressed data, the uncompressed form of the compressed data, a C2 ECC of a first C1 ECC of the uncompressed form of the compressed data, and one or more C1 ECCs comprising the first C1 ECC and a second C1 ECC of the C2 ECC are stored in a second buffer. Success is indicated if the one or more C1 ECCs match corresponding C1 ECCs calculated from data and C1 ECCs read from the second buffer, and if a C1 ECC of the data read from the second buffer and written to a medium matches a C1 ECC of corresponding data read back from the medium.