Data recording medium with a region for recording data, the region having a data recording area and a postamble area

摘要

A data recording medium suitable for an optical disk such as DVD is disclosed. The data recording medium has a plurality of sectors. The sector has a header area to store address information of the sector, a gap area for power calibration of a laser beam used for data recording, a data recording area to store a plurality of modulated codes obtained by modulating the data, a postamble area located immediately after the data recording area, and a buffer area to separate sectors. The modulated code includes information to demodulate a modulated code located immediately before each modulated code. The postamble area stores information to demodulate the final demodulated code in the data recording area. A data pattern stored in the postamble area includes synchronization pattern, and is determined based on a DSV of the data pattern, or satisfying the run length limitation.