该文研究了可重写光盘机DSP数字伺服控制的问题，给出了数字控制系统的硬件构成。

The problems are studied about the digital servo using Digital Signal Processor (DSP)for rewritable optical disk drives, and the system scheme is presented.

youdao

有一种叫做CD - RW，是一种可反复重刻(重写)的光盘，其使用原理跟软盘一样。

One format is called CD-RWs. They can be recorded on and re-recorded on (rewritten on) as you would do with a floppy disk3.

youdao