IBM Professional Series User Manual page 26

NOTE:
The VM/PC installation process always uses only
one fixed disk (the C disk). You may have a system
with two fixed disks. If so, you can direct the
installation to your D disk prior to beginning the
installation process. To do this, issue the DOS
command:
ASSIGN C=D
Following installation, the ASSIGN command can be
used whenever you wish to use VM/PC. If you
want to run VM/PC from your D disk without using
the ASSIGN command, or if you want VM/PC to
use both of your fixed disks, read Chapter
3, "Configuring Your VM/PC System" on page 3-1.
Find out how much unused space is available on your C
disk. You can do this by using the DOS commands
CHKDSK or DIR. If you do not have at least 1,600,000
bytes of available space, you should read the section
"How Much Disk Space Is Required?" before
continuing.
Once you have satisfied the items to be checked, you are
ready to make your backup copy of the VM/PC Distribution
Diskettes.
Chapter 2. Installing VM/PC 2-3