This ceramic substrate will not react with oxygen or moisture and is not damaged by temperatures that would significantly warp a conventional plastic optical disc.

FORBES: Storing Information for a Thousand Years

Recently a company from Utah called Millenniata has introduced an optical disc technology utilizing a disc in which the data is etched (or engraved) into a ceramic substrate rather than stamped on plastic like conventional optical discs.

FORBES: Storing Information for a Thousand Years