Highly Compatible Write-Once and Reversible Optical Recording Media
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Jan-31
Write-once and reversible phase-change optical recording media usually are made with very different active layers. As a result, two separate production processes are required to produce the two media. Significant simplification, with attendant cost savings, may be realized when the production process of the write-once media can be made very similar to those used to produce reversible media. We disclose here write-once and reversible media with such characteristics. Write-once media based on a phase-change approach are well known. These media crystallize extremely fast so that short laser pulses, >30 ns to 200 ns in duration, can _ crystallize the material and record data. Usually, recording is accomplished by selectively crystallizing areas in an amorphous track.