Kreisen 3 8 6 X / X E - Manual (Page 83)

As
you can see, the system prompt has changed to show the
new default drive letter.
Note
If the computer responds:
Invalid Drive Specification
it may mean that tither there is no hard disk system
installed, or your Hard disk drive has not been configured
yet. See Chapter 6, “Using Your Hard Disk,” for
instructions.
From the A> prompt, try the command:
The computer will respond:
Press ENTER after you insert the diskette into the drive, then
the system prompt will be:
If you have a dual floppy disk drive system, the second, or “B”
drive is now the system default drive, as indicated by the new
system prompt. If performed on a single drive computer system,
Using
MS-DOS With
Your Computer 4-11