Patent ID: 8134904

Claim:
A recording method for recording AV data in a unit of a cell as an information recording/reproducing unit to a recording medium having a first recording layer and a second recording layer, the cell including a plurality of temporally continuous minimum data units, each temporally continuous minimum data unit being a unit for recording and reproducing the AV data to and from the recording medium, the method comprising: during recording the AV data in a unit of a cell in the first recording layer, detecting a size of an unrecorded area of the first recording layer by continuously detecting an end of the cell; comparing the size of the unrecorded area of the first recording layer with a maximum allowable size of the cell; and stopping recording in the first recording layer at a beginning of the unit of the cell when the size of the unrecorded area is smaller than the maximum allowable size of the cell, and recording subsequent data of the AV data in the second recording layer.