Abstract
Phase-change recording media1) are widely used in rewritable optical disks such as the CD-RW, DVD-RAM, DVD±RW and Blu-ray disc2). Rewritable phase-change optical disks have several different applications corresponding to different recording speed. For example, DVD phase-change disks for the video application are usually used at a low rotation speed, which is suitable for real time operation; DVD phase-change disks for the personal computer application are usually used at a high rotation speed to achieve a high data transfer rate. Even for the same application, the recording speed always increases because of the market demand. Therefore it is necessary to develop rewritable phase-change disk compatible with a broad range of recording speed.
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