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by Edgar Hernández Zúñiga
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.
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:
c:\rawriteIt asks for the source: d:\images\boot\N00
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:
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 the case...
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 so. 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:
sco nt linuxFinish the installation process and reboot. You must be able to boot NT with:
lilo -D <lable>
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