Patent ID: 8363349

Claim:
A recording medium controller configured to use a recording technique of collectively rewriting all tracks included in a track group, which comprises a plurality of tracks and is a unit for writing data, by causing adjacent tracks to be partially overlapped with each other, comprising: a recording medium comprising a write area having the plurality of the track groups and an escape area temporarily storing data therein; an input module configured to receive an update command for data recorded in the write area; a reading module configured to read data from a first track group, which includes the data to be updated by the update command, of the track groups; and a writing module configured to write the data to be updated by the update command to the escape area after receiving the update command, and to rewrite merged data obtained by merging the data read from the escape area and the data read from the first track group to each track comprised in a second track group of the track groups by using the recording technique.