Xref: utzoo comp.sys.ibm.pc:32389 comp.binaries.ibm.pc.d:4013
Path: utzoo!utgpu!watmath!julian!uwovax!2014_2300
From: 2014_2300@uwovax.uwo.ca (Ken Hunt')
Newsgroups: comp.sys.ibm.pc,comp.binaries.ibm.pc.d
Subject: Re: Help with strange partitioning--logical drive setup
Message-ID: <3238@uwovax.uwo.ca>
Date: 31 Jul 89 21:05:56 GMT
References: <3216@uwovax.uwo.ca> <8466@bsu-cs.bsu.edu>
Lines: 59

In article <8466@bsu-cs.bsu.edu>, dhesi@bsu-cs.bsu.edu (Rahul Dhesi) writes:
> In article <3216@uwovax.uwo.ca> 2014_5001@uwovax.uwo.ca writes:
>>I have my hard drive partitioned into a DOS3.3 partition and a DOS2.11
>>partition (Why?  Simply as DOS2.11 gives me more free RAM, which I do need).
> 
> Here is an alternative way of using both MS-DOS 2.11 and 3.3 on the
> same machine.
> 
> Use only one big partition for both.
> 
> Install 2.11 on the hard disk.
> 
> Create a boot floppy for booting 3.3.  On the boot floppy, in the
> config.sys file, specify
> 
> 	  shell = C:\msdos3\command.com C:\msdos3 /e:2000 /p
> 
> (assuming C: is your hard disk).  (Adjust parameters as needed.)  On
> the C: disk copy the COMMAND.COM from MS-DOS 3.3 to the \MSDOS3
> subdirectory.  In the autoexec.bat file on the boot disk, set PATH to
> include directories on the hard disk that contain MS-DOS 3.3 programs,
> not 2.11 programs.
> 
> When you boot from the hard disk, you get 2.11.  When you boot from the
> boot floppy, you get 3.3.  In either case you use the same files.  If
> you have trouble making 2.11 read a hard disk formatted by 3.3 (might
> happen, might not), just use 2.11 to format the hard disk.
> 
> If you format using 2.11, you may get big clusters on the disk causing
> more fragmentation.  If at all possible format with 3.3, or use one of
> the patch schemes that I've seen floating around here and there to get
> smaller clusters with 2.11.
> 
> An alternative is to boot 3.3 from the hard disk and boot 2.11 from a
> floppy.  This is not so good, because 2.11 has a bug that causes it to
> always reload COMMAND.COM from the boot disk no matter what the shell=
> statement says in config.sys.  This will then require you to keep the
> boot disk in drive A: all the time, or be annoyed by messages asking
> you to insert COMMAND.COM disk in drive A:.
> 
> On some machines you can extend available memory to a little more than
> 640K by using some of the empty memory space.  This is highly
> system-specific and may require changing jumpers in your system, and I
> have no idea how to do it, but I know that some people have done it
> successfully.

This is interesting, but the only reasson I switched from 2.11 to 3.3 was to
save HD space (only 20Meg and can't afford any more).  So I would certainly
need a way of patching DOS 2.11 for smaller clusters.  My DOS 2.11 cannot
read my 3.3 format.  That's why I thought I would need to partition my drive.

> -- 
> Rahul Dhesi <dhesi@bsu-cs.bsu.edu>
> UUCP:    ...!{iuvax,pur-ee}!bsu-cs!dhesi
-- 
!-----------------------------------------------------------------------!
! Alex Pruss Dept. of Astronomy, Dept. of Applied Math,                 !
!	University of Western Ontario, London, Ontario, Canada          !
!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~!