Rewritable recording medium capable of changing the length and start position of synchronization portion

摘要

A rewritable recording medium having a first adjustment region recorded with first signal information, a data portion recorded with data information after the first adjustment region, and second adjustment region recorded with a second signal information after the data portion. Each time the first signal information is rerecorded, a length of the first adjustment region changes and a start position of the first adjustment region changes.