A method and apparatus for write protection of rewritable compact disks and digital
video disks. A Power Calibration Area is covered to prevent the drive laser from
completing a calibration procedure. In one embodiment, the disk has an indented
area formed around the central hole in the disk. A ring shaped plug is inserted
into the indented area, with an extended surface that covers the calibration area.
In an alternative embodiment, an adhesive label, ink, dye or paint is used. In
still another alternative embodiment, the calibration area is mechanically abraded
to provide permanent write protection. Finally, the laser in the drive may be used
to darken, damage or destroy the calibration area or a transparent label over the
calibration area, for permanent write protection.
