Dos and unix on same Disk

[harold.e.bamford]

In article <13719 at ccncsu.ColoState.EDU> justicec at handel.cs.colostate.edu (Christopher Justice) writes:
>I'm having a problem installing both AT+T System V R3.2.2 and Dos 4.0 on the 
>same disk drive.  I partioned the drive (330 meg) into an 80 meg Dos 
>partition and the rest for unix.  They installed succesfully, but Dos gives
>me a "General failure reading drive C:" when I try to run programs.  This
>happens irregularly.  Unix has given me a couple of "unrequested harddrive
>interrupt errors". 
>
>Our computer Vendor is trying to tell us that you can not install unix
>and dos on the same drive, or possibly that dos can not take up more than
>9% of the drive.  I find this hard to believe.  If Dos and unix are on
>different partitions, it shouldn't matter.  
>
>Is using Dos and unix on the same drive common?  Can you do this?  I'd like
>to hear about your experience with doing this.

We have both DOS (3.2) and unix (SVR2) on the same disk in our
6386.  One problem we had was that DOS doesn't like partitions over
about 32 Meg.  Your vendor says you should have no more than 9% of
your 330 Meg drive.  That's 29.7 Meg.  Perhaps this is your
problem.  You CAN have multiple DOS partitions, however...  Also,
we found that the DOS partition had to be the first TRACKS on the
disk and that unix had to have the first partition NUMBER on the
disk.  This was probably just a local anomoly, but after two weeks
of screwing around, we finally got both unix and DOS running on the
same disk.

Good luck.

-- Harold Bamford

#include <usual.disclaimers>