用外置光驱装的。要format C盘的时候，出现：
setup was unable to format the partition. The disk may be damaged.
Make sure the drive is switched on and properly connected to your computer.
If the disk is a SCSI disk, make sure your SCSI devices are properly
terminated. Consult your computer manual or SCSI adapter documentation for
the more information.
这是怎么回事？应该怎么解决呢？
