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windows NT dual boot

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Original Message
Name: finguz
Date: December 3, 2003 at 17:11:25 Pacific
Subject: windows NT dual boot
OS: many
CPU/Ram: -
Comment:

I have been having a problem i thought you guys might be able to figure out. I have a crappy pc just for use as a project. I partitioned the hard drive into like 20 different drives which i want to each have a seperate operating systems. I have installed windows nt4 workstation, nt4 server, windows 2000 pro, windows xp pro. They all work great. But then i installed windows 98, and now all of them dont work. i also tried windows 95 and msdos, and they wont work either. Why cant windows nt dual boot with 95, 98 or msdos? is it even possible?


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Response Number 1
Name: trvlr
Date: December 4, 2003 at 10:18:30 Pacific
Subject: windows NT dual boot
Reply: (edit)

Without using an add-in boot-utils you can have:

DOS + one of the '98x family (or ME) + NTWS + NTSvr + W2K-Pro + W2K-Svr + XP-Pro + XP-Home); or any mix of those.

You say you 'had': windows nt4 workstation, nt4 server, windows 2000 pro, windows xp pro, then installed '98 and now none of those earlier OS will boot...

Hardly surprising... When '98 went in it overwrote the XP version of the mbr with the '98 version; this disabled the XP boot-loader which controlled the multi-boot environment... You will also be missing the required bootsect.dos via which '98 will boot from the XP boot-loader (once it's restored).

There are various ways to restore XP control (also to establish the bootsect.dos) and complete the multi-boot to include '98. But rather than go thru' them all here... suggest you visit:

http://www.dougknox.com

and go thru' the item in the section in the XP Tips (right hand column) - installing '98/ME after XP.

It's one of many ways to go about it...

********
Useful to understand:
The core requirement for assorted M$ OS in a dual/multi-boot (without using an add-in boot-util) is that the active Primary must be accessible to all installed OS at boot-time... If DOS/NT are installed then it MUST be fat16 - unless using an add-in boot-util. If no DOS or NT present then it can be fat32; if no DOS, NT '9x(ME) it can even be ntfs. (There are exceptions to these basic rules/conditions.) Fat16 is the only common format across all M$ OS - which is why it's often the best format to use (and also if C: = 540Meg or less). The active Primary is where all M$ OS will install their appropriate boot/start-up files. (There are workarounds to accomodate 'some' of the M$ OS boot-file problems - and allow fat32 in C: .)

But on this occasion (because DOS and NTWS/Svr are present ...) it does require that C: (active Primary) = fat16. Otherwise it's the same as if C: = fat32 (which is how Doug Knox discusses it - as he is not including the NTWS/Svr in his equation).

Need more help - post back?


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Response Number 2
Name: wanderer
Date: December 5, 2003 at 06:59:14 Pacific
Subject: windows NT dual boot
Reply: (edit)

I would add that MS OSs fall into two catagories; msdos.sys based [dos, 98, ME] and ntldr based [nt/w2k/xp]

Since msdos.sys OS's can't cohabitate [they all have their own versions of msdos.sys and io.sys] these overwrite each other. To have multiple msdos.sys based OSs you have to do something like How to use PQboot as found in the simple how to's here or use a boot manager. Boot.ini can't be used in this fashion without special procedures. Those special procedures are to create a bootsect.dos file for each msdos.sys based OS and then referance them in the boot.ini.

Otherwise the rule with one msdos.sys OS and Ntldr based OS's is to install the older first in order to the newest. Or use recovery console to "repair" the boot loader when you do it out of order.

FYI


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