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对国际新推出的可擦写相变与4×只读双功能光存储系统PD进行了技术性论述分析，内容包括：直接重写相变光盘介质、PD的新型光学头技术以及双功能驱动的机理。
The essay introduces the newly introduced PD and 4 × read-only dual-function optical storage system PD, including: direct rewriting phase change optical disk media, new optical pickup technology of PD and dual-function driving mechanism .