| 摘要 |
A host computer transmits to a disk drive an address or an ID number representing a disk to be used, and the disk drive receives from the host computer the address or ID number representing the disk to be used, wherein when the received address or ID number representing the disk represents a CD-ROM, a reading process for the CD-ROM is executed, and when the received address or ID number presenting the disk represents an R/W-OD, a writing process or a reading process for the R/W-OD is executed.
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