Dual density disc with associated properties
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United States of America Patent
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Jun 30, 2009
Grant Date -
Aug 28, 2003
app pub date -
Feb 26, 2002
filing date -
Feb 26, 2002
priority date (Note) -
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Abstract
An optical storage disc has portions for storing pre-recorded or mastered information and portions for storing user writable information, where the mastered portion and the writable portions have different storage capacities or areal data densities. During manufacture, a substrate is formed with a sequence of bumps to represent the mastered information and a series of grooves and lands, where information can later be written on the lands. A phase-change material is deposited over the substrate, the phase-change material changing both physical structure and optical constants when written to, e.g., by a laser.
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