A while ago someone was experiencing the aggravation of wanting to install DOS
on a machine with floppy drive A: as 5.25" 1.2Meg instead of the 3.5" 1.44Meg
format that the installation diskettes come on and =force= you to use. Several
of us had wonderous discussions on how to swap the drives mechanically, but I
came across this little ditty in my DOS 6.22 directory called README.DAMMIT!
<G> It tells you how to =do= the installation from a 1.2Meg.  Of course, you
must allready HAVE DOS installed on your C: drive to be able to read this....
Argh! Billy Boy, ya make us NUTS! 

Here it is, I found it under dskcmprsn, I have not tried it so can't vouch
for it, but FWIW:
================

7.4  Converting Other Disk-Compression Software to DriveSpace
-------------------------------------------------------------
If you are not using Stacker 3.1 disk compression or XtraDrive
disk compression, carry out the following procedure to convert
your disk-compression software to DriveSpace.

1. Install MS-DOS 6.22 if you haven't already done so.

2. Use Microsoft Backup for MS-DOS to back up the files on your
   hard disk. If you didn't install Backup for MS-DOS during Setup,
   see the chapter "Getting Started" in the MICROSOFT MS-DOS USER'S
   GUIDE for instructions on installing it.

3. If your Setup disks are compatible with drive A, insert
   Setup Disk 1 in drive A, and restart your computer. After
   Setup displays the first screen, quit Setup by pressing F3 twice.

   If your Setup disks are not compatible with drive A,
   create a startup floppy disk for drive A. To do this, insert
   Setup Disk 1 in drive B, and a blank floppy disk in drive A.
   Then type B:SETUP /F at the command prompt.

   When prompted, choose to install MS-DOS on the floppy disk
   in drive A. After Setup is finished, leave the disk in drive A,
   and restart your computer.

4. Use the FORMAT command to format the drive that contains the
   file that contains all of your compressed files. If you don't know
   where this file is located, see your disk-compression documentation.

   If you are reformatting drive C, include the /S switch to transfer
   system files to it.

5. If you formatted drive C, make sure Setup Disk 1 is in drive A
   or B, and type A:SETUP or B:SETUP at the command prompt.

   Follow the instructions on your screen.
===========================================================================
Happy installation, DOS fans! 
Z�D!