Patent ID: 8422344

Claim:
A rewriteable and readable optical information storage medium comprising: a plurality of information recording layers each including a recording mark having a length shorter than an optical system resolution limit, wherein: one of the plurality of information recording layer that is closest to a reproduction-laser-incident surface of the rewriteable and readable optical information storage medium is capable of being read with a reproduction laser having power lower than that of a reproduction laser for reading another one of the plurality of information recording layers that is farthest from the reproduction-laser-incident surface, and the rewriteable and readable optical information storage medium includes an area located near its center hole in which area medium information on a structure of the rewriteable and readable optical information storage medium, the medium information being intended for allowing an optical information storage medium reproducing apparatus to determine whether to set the reproduction laser power for the information recording layer that is closest to the reproduction-laser-incident surface to be not less than 1.0 mW but less than 1.1 mW, is stored.