Patent ID: 6532206
Filing Date: 2003-03-11
Classification: G11B

Abstract:
An information record medium, on which information is optically recorded and reproduced while a servo control is performed with respect to the information record medium by a push-pull method, comprising:a record/reproduction area having a groove track, which is wobbled and continuously formed and on which the information is recorded and reproduced by a phase changing method by use of a light beam having a wavelength of not less than 630 nm (nanometer) and not more than 680 nm; and a reproduction-dedicated area where a plurality of phase pits are wobbled and formed in advance, each having a depth of not less than 60 nm and not more than 90 nm and where only an information reproduction is possible by the light beam, wherein a pre-pit indicating address information, which corresponds to a record position on the information record medium, of the information, is formed within at least the record/reproduction area except the reproduction-dedicated area.