Optical disk and its management system

Application Number: 00109276
Application Date: 2000.06.16
Publication Number: 1281219
Publication Date: 2001.01.24
Priority Information: 1999/7/19 JP 204899/99; 2000/3/3 JP 58624/2000
International: G11B19/04;G11B23/30
Applicant(s) Name: Victor Co. of Japan, Ltd.
Inventor(s) Name: Nishisawa Aki;Oishi Kenshi
Patent Agency Code: 11219
Patent Agent: xie lina
Abstract Disclosed is an optical disc management system and optical disc. When the optical disc management system initializes the phase change type disc, the disc is endowed with specific administrative date and is not eliminated even if data recording is processed, and the disc recording playback is managed with administrative date. Through altering the light intensity of the initialization laser ray L, or going on irradiating, the administrative date is recorded according to the reflectivity of the specific figures a to c in the diameter direction or circumferencial direction of the data recording area De in the disc D1, D2, D21, D3. When scanning disc, the administrative date in the specific figures a to c is read from the reflected light recorded in the data area.