this command will still change the system prompt to B>, even though there is only one physical drive present.
The BIOS “pretends” there are two disk drives present. It routes all commands intended for the B drive back to the A drive.
This feature is intended to allow owners of single drive systems to use application software designed for dual drive systems.
Copying Your MS-DOS Diskettes
The first important task you must complete with your new system is to make a “backup” copy of your MS-DOS diskettes. To do this, you will need seven blank diskettes. It is a good idea to prepare seven diskette labels at this time. Write the following on those diskette labels, using a felt tipped pen:
MS-DOS MAIN SYSTEM DISKETTE
BACKUP COPY (Version #)
Write down the MS-DOS version number on each diskette labels. This will avoid confusion later if you upgrade your operating system to a new version. As you finish copying and checking each MS-DOS master diskette, peel the correct label off of the backing paper and place it on the upper left-hand side of the front face of the new diskette.
The following procedures will show you how to make backup copies of your MS-DOS master diskettes on both single and dualdrive systems.
4-12 Using MS-DOS With Your Computer