Patent ID: 7404111

Claim:
An information recording medium comprising: a management area where management information is recorded; and a plurality of physical sector areas used to record a plurality of physical sector data blocks, which are generated by combining some data contained in an ECC block containing a plurality of segmented blocks, wherein the ECC block as a source of the plurality of physical sector data blocks to be recorded in said plurality of physical sector areas is generated via a predetermined process, and the predetermined process generates the ECC block by: generating sector data which contains a data ID and is formed of a first number of bytes; generating re-arranged sector data by re-arranging data contained in the sector data to predetermined positions; generating a sector block by combining a plurality of re-arranged sector data items; generating the plurality of segmented blocks by segmenting the sector block; generating outer-code parity data formed of a plurality of rows by encoding, in a column direction, data which forms each segmented block; generating inner-code parity data by encoding, in a row direction, data which forms each segmented block and the generated outer-code parity data; and individually appending the generated outer- and inner-code parity data to each segmented block, and inserting the generated outer-code parity data into even-numbered sector data and odd-numbered sector data in units of one row such that the insertion positions of the generated outer-code parity data are different between the even-numbered sector data and the odd-numbered sector data.