Reply To: Invalid drive specification
I think this was supposed to have been posted in the DOS Talk or Support forums, and not here, since it has nothing to do with Abuse.
By the answer I also assume OP does not know how CD drives work in DOS. They do not work out of the box. You need to install a CD driver in CONFIG.SYS, then run a CD extender program (MSCDEX or SHSUCDX or the like) in AUTOEXEC.BAT.