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When a CD-ROM drive is initialized under Windows NT, it uses the first available drive letter. There is no straightforward method of choosing a drive letter. However, you can set up your other drives and partitions in Disk Administrator such that the drive letter you want to use for your CD-ROM is unused. For example, if you have two partitions and you want your CD-ROM to be drive D, use Disk Administrator to set the partition drive letters to C and E. When the CD-ROM initializes, it will use D because it is the first available drive letter.
NOTE: This workaround does not let you choose a drive letter that is used for a network drive. The next available drive letter used by a local physical drive will be used by the CD-ROM. There is no workaround.
NOTE: You can also use the SUBST command to assign a different drive letter to the CD-ROM drive.
Microsoft has confirmed this to be a problem in Windows NT version 3.1. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.