PD drive
Refers to the Phase-change Dual optical technology as implemented in Panasonic?s patented PD system.
Similar to phase-change WORM technology (as used in CD-R) this uses an active layer with reversible properties allowing data to be overwritten in a single pass of the read/write head.
This compares with the two-pass operation of conventional Magneto Optical devices.
Panasonic's PD technology is included by virtue the compatibility it offers with certain CD media formats - a Panasonic DVD-RAM device also being capable of reading and writing PD discs.
