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phase change disk
Last modified: Saturday, July 05, 1997 

A type of rewritable optical disk that employs the phase change recording method. Using this technique, the disk drive writes data with a laser that changes spots on the disk between amorphous and crystalline states. An optical head reads data by detecting the difference in reflected light from amorphous and crystalline spots. A medium-intensity pulse can then restore the original crystalline structure.

Magneto-optical and dye-polymer technologies offer similar capabilities for developing re-writable optical disks.

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