Patent ID: 8154967
Filing Date: 2012-04-10
Classification: G11B

Abstract:
1. An optical recording medium including a plurality of recording layers, the optical recording medium comprising: an adjustment data recording area for recording therein adjustment data used for adjusting focus or spherical aberration of laser light used for recording/reproduction, the adjustment data recording area being disposed at a predetermined position on each of the plurality of recording layers; and a disc management area or temporary disc management area to record at least replacement management information, the disc management area including a disc definition structure including a single one-byte pre-write area flag indicating for all of the plurality of recording layers of the optical recording medium whether or not the adjustment data for each respective layer has been recorded in the adjustment data recording area, wherein the single one-byte pre-write area flag comprises only one bit for each respective recording layer so that a value of the only one bit indicates whether or not the adjustment data has been recorded for the respective recording layer.