Information storage medium with first and second recording regions each having a predetermined recording density

摘要

A recording medium is provided for use with a device for recording data on and reading data from the recording medium using first and second recording and reading methods. A first recording region of the recording medium stores data recorded using the first method and includes blocks having a first data storage capacity. A second recording region of the recording medium stores data recorded using the second method and includes blocks having a second data storage capacity. The first and second recording regions may be, for example, first and second offset helical grooves formed on the recording medium. A device for recording and reading data on the recording medium using the first and second recording methods in accordance with identification data identifying the methods is also provided.