Booting three different operating systems: RedHat Linux 5.2, SCO Openserver 5.0.5 and Windows NT 4.0
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original in es Edgar Hernández
es to en Manuel Dominguez
AboutTheAuthor:[Sobre el Autor]
This document explains how the three operating systems RedHat Linux 5.2, SCO Openserver 5.0.5 and Windows NT 4.0 (or alike) can be installed and booted
on the same computer from the same hard drive. All this is done with Lilo as the
boot loader. My article bases on the above operating system versions but
it will not be much different for another configuration.
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I have decided to write this document to provide the the Linux community
with documentaiton on how to setup such a tripple boot system.
In our Computer Science Lab at University we had to find a solution
to NT during a SCO Openserver installation. Courses
in the Computer Lab are taught in all three operating systems as part of
the course flow for the Computer Science degree.
The situation: NT uses its NTFS, SCO runs HTFS file system,
and Linux uses a
ext2 and its swap partition. This was a problem, since SCO did not recognize the
NTFS partition created during NT installation, and was getting the whole
hard drive space, a totally unwanted effect. We had to make some experiments
and at least two NT and SCO installation were needed to arrive at this
Installing SCO Openserver 5.0.5
It was a surprise to me how a Unix system, in this case SCO, was not able
to integrate with NT, thus the first step is the SCO Openserver installation.
Insert your SCO boot disk. If you do not have one, you can create it
with rawrite. This is the simplest solution.
On a machine with Windows or DOS run:
It asks for the source: d:\images\boot\N00
And the target drive: a:\
With this disk, a SCO kernel image will be loaded and installation can
proceed. Accept, choose the option fresh installation and install SCO Openserver.
Reboot and you will see something like this:
Installing Windows NT
Let us go to the next step. The machine, an IBM 300GL, allows booting from
the CD-ROM, thus we insert the NT installation disk and the file copy process
The complex NT installation is now left in your hands, until rebooting
the system and...
You will find that SCO has dissapeared, logically, since each operating
system takes possesion of the hard drive MBR (Master Boot Record). So,
I was wondering how to recover SCO. I wanted also to keep the NTFS under NT for security reasons.
The problem was now how to
boot again SCO.
During the installation process a message appeared similar to "if you
wish to use your other operating system, you will have to reactivate the
partition and make it bootable". This looked like the solution for my problem.
You have to go to Administration Tools, select
Disk Administration and you will see a Unix type partition. Select and activate
it: SCO is back!
You will see:
If you type Enter the system will boot with SCO Openserver, but
how am I going to boot NT again?. I knew LiLo and it is the
best loader (together with the OS/2 Loader), but how can Lilo work together
with the SCO loader?.
It's simple: given that SCO knows how to differentiate between filesystems
like NTFS, HPFS and so on, you must use the following initial command:
Boot: bootos os2
You will see NT booting. Although this step is not required when
finally installing also Linux it seemed interesting to me.
Furthermore, it took
more than 1/2 hour of investigation. You might have known this, but if it is not
Installing RedHat Linux
Until now, about 1 1/2 hrs. have passed on a decent machine, let's say a
Pentium MMX/233/32RAM. Now the best part: Install Linux and control everything
I have previously mentioned a RedHat Linux distribution but nowadays any
distribution can be booted just from CD-rom if your CD-rom drive is capable to do
Thus, you have arrive at the screen where you can decide how to install Lilo.
Choose Master Boot Record, go on and label each bootable
partition with a different name. There should be three:
Finish the installation process and reboot. You must be able to boot NT
and Linux will be the default boot system. If you wish to make other
systems the default boot, it can be made with:
lilo -D <lable>
As some of you may have noticed, in general, the installation of two Unix-like
systems in the same machine is unusual. That is the main reason that motivated
this document and I hope it will be useful to you. Any doubts, comment or suggestion
are always welcome...
I suggest reading the Multiboot HOWTO and the LILO man page. For
SCO, the SCO Openserver Handbook was a help.