Phase-change Dual (PD) disk (1995 – 1998)


Introduced by Panasonic in 1995, the Phase-Change Dual (PD) disk is a rewritable optical disc similar to later technologies like CD-RW. They have a capacity of 650MB and could be rewritten 500,000 times.

Like DVD-RAM disks, they are enclosed in a protective cartridge.

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