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Phasewriter Dual

The Phasewriter Dual (PD) was the first generation of optical storage devices, that based on the phase-change technology. There is no homogenous way of writing onto a PD. The PD was introduced 1995 by Panasonic but soon it replaced by CD-ROM and later by DVD. Some of the first generation CD-ROM drives were compatible with PD but since 2001 the PD-discs and PD-drives are not longer available.

Related Topics:
CD-ROM
DVD

References:
http://en.wikipedia.org/wiki/Phase-change_Dual
http://de.wikipedia.org/wiki/Phasewriter_Dual