Erasable Compact Disc Using Phase Change Optical Media

Abstract

An application of phase change optical media for a erasable compact disc(CD) has been studied. As the phase change optical disks have featuring properties; overwritable only by power modulation of a single laser beam and detectable reproducing signals directly by reflectivity changes, it can be said that they intrinsically have high compatibility with commercial read-only CD or write-once CD. Recording the CD format signals means pulse width modulation (PWM) recording at low linear velocity. Accordingly, teardrop shaped distortions of recording marks, which are common problems for heat-mode recording media, should be suppressed.