Dual density disc with associated properties

Details Dual density disc with associated properties Dual density disc with associated properties

2002-02-26

2009-06-30

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S277000

Reexamination Certificate

active

07554898

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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