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一台机器可能有不止一个CD-ROM驱动器。现在CD-ROM已经是PC机的标准配置，此外再装个可擦写的光盘驱动，甚至是DVD都是很常见的事情。不管一台机器上装多少个不同的驱动器，如何找到它们呢？请用下程序-a machine may have more than one CD-ROM drive. Now CD-ROM is PC"s standard configuration, in addition to rearm-erasable CD-ROM drive, even DVD is a very common thing. Whether a machine makeup number of different drives, how to find them? With the following procedures
