Data generation method and apparatus

Abstract

A data generator generating a data stream having a first data generation unit and a second data generation unit. The first data generation unit recording data on a recording medium with a first recording density. The first and second units encoding input digital data in accordance with a first error correction coding to generate a first check parity, making a unit block having a data area and the first check parity provided at an end of data area, and dividing the unit block. The first unit providing a sync pattern at a head of each of the first divided areas to obtain a first data stream. The second data generation unit recording data on a recording medium with a second recording density. The second unit providing a sync pattern at a head of the unit block to obtain a second data stream.

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