To provide a bare type double-sided information recording medium capable of easily recognizing it's A-surface or B-surface by a user or a drive device, convenient in its use and reduced in the loss time of recording and reproducing operations.
On each of two information recording surfaces constituting this bare type double-sided information recording medium, an A or B-surface identification information F is recorded or displayed to identify one information recording surface or another information recording surface. The recording of the information F is conducted as follows, i.e., an A or B-surface identification recording section of one or plural bits is provided at a 'Disc manufacturer certification' area in a 'DDS(Disc Definition Structure)' provided in defect control areas 'DMA1 and DMA2' of a read-in area 10 where is preformatted on a disk. Then, the information F is written into the section in a form of prepits or written information.
OBARA HIROSHI
IKARI YOSHIHIRO
OTSUKA KOICHI
