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- Coexistence of DOS, Windows NT, and OS/2 2.0
- On Hard Disk Drive.
-
- It has been heard to this author that many on this BBS have
- not been able to load DOS, Windows NT, and OS/2 2.0 on the same
- computer. Contrary to this, I have successfully loaded these on
- a 486DX33 and 386SX25 with no glitches. The trick to the loading
- all three is to have DOS loaded first on Drive (Active Partition)
- C: on a sufficiently large drive to hold all the software you
- desire. In my case, I have been using 500+ MB Conner and 500+
- Fujitsu IDE drives. 500MB is a little large, but considering all
- the software one uses, at the minimum you could get by with is
- 200MB but then you wouldn't have much room to do anything after
- DOS, Windows 3.0, Windows NT, the Win32 SDK, and OS/2 2.0 eat up
- all your disk space.
-
- Never-the-less, to start with, if your system has never seen
- OS/2 (or its Boot manager) or Windows NT things are a lot simpler.
- All you have to do is clear at least 70MB in your C: partition, use
- the OS/2 installation (FDISK) or DOS 5.0 Fdisk to make at least a
- 35MB logical partition somewhere on your drive, and a "1MB"
- "unnamed" partition the VERY END of your drive. Next, you have to
- load Windows NT and Win32 SDK on the C partition and be assured
- that DOS and Windows NT are functional. Then all you have to do
- is load OS/2's Boot Manager in that "Last free 1MB partition" on
- your drive and put OS/2 in the 35 MB logical partition you created
- earlier. What you should see is first a choice between DOS and
- OS/2 and then a choice between DOS and Windows NT.
-
- If your system has seen anything but DOS you have a bit more
- work to do. First, back up your C: partition and any other
- partitions you may fear to lose (My 500MB drives had C: to G:
- partitions to start). I already had a 100+MB C: partition and
- moved everything elsewhere except the root directory, the DOS
- directory, and the Windows 3.1 basic working system. Next, I
- booted the system with a DOS 5.0 Floppy having "Format", "Sys",
- and "Fdisk" at least; and then proceeded to destroy the C:
- partition and recreate it with Fdisk (I already had it at 100MB so
- I didn't have to reconstruct the whole drive although maybe that
- would be the best plan). Then I also created a 1MB non-DOS
- partition at the "very end" of the 100MB G: existed and created a
- logical drive of 34MB at the G: or H: position (H: would be better
- because when you restore the now 65MB G: logical partition contents
- your paths won't get screwed up) and finally the other 65MB logical
- partition with the rest. The next step was to format the G: & H:
- drives (the 34MB partition formatting could wait because the OS/2
- installation will take care of that but it goes fast and is
- probably cleaner). Now you have a "clean" area ready for
- installation of all three operating systems. First, you must put
- DOS (at a minimum) back on the C: drive and anything else you like
- just so you have at least 70MB free for Windows NT and the Win32
- SDK. Next step; install Windows NT + Win32 SDK and be sure they
- work. After this I edited the "boot.ini" to make DOS the default -
- it's your choice depending where you want to end up. Then all you
- have to do is install OS/2 2.0 per instructions using that 1MB free
- non-DOS partition for Boot Manager and put OS/2 2.0 in the 34MB
- partition you created. AND wonder of wonders everything seems to
- hold together (at least with IDE drives - I don't know about SCSI
- drives).
-
- The trick to the loading is to have a system free of all the
- weird things the NT loader and OS/2 Boot Manager do to things you
- cannot see. Once I messed up Windows NT and had to go through the
- whole procedure over - agony of agonies! Good Luck!!!!!