Dos and unix on same Disk

[Steve Resnick]

In article <1991Mar25.164947.10980 at cbnewsd.att.com> bamford at cbnewsd.att.com (harold.e.bamford) writes:
>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>

I can see the problem with DOS 3.2 - DOS 3.2 didn't have an extended partition.
I have had successfully, DOS 3.3 and DOS 4.01 on the same disk as Esix Sys V3.2
I was running with a Priam ID768 330 Meg ESDI drive on a Micronics/Wietek
386/20.   What kind of drive and controller are you using? Are you using
a "proprietary" partition. (eg Disk Mangler, Ontrack, Speed Stor, etc)?

- Steve

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