I have seen someone using XOSL to do multi-boot. Actually, this is my first time messing up with multiple OS. Do you guys have any tutorials or guides for me to learn?

Assuming that I am using a brand new hard disk, what should I do first? If I have installed two or more OSs on the hard disk, how do I share files between these OSs?

A little bit off-topic: if my BIOS supports booting from a thumb drive, can it support booting from an external hard disk as well?

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+1 for linking obscure app ;p – Journeyman Geek Feb 26 '10 at 2:23
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The first question i'd ask is, what OSes are you intending to install? If its linux and windows varients,Partion, then install windows first (oldest release to newest release) then install linux. Grub will take care of everything.

XOSL does seem to play nice with some of the oldies- which i'm unsure if grub supports.

Generally external hard drives should boot off usb if the firmware supports it. the only way to really tell is to try

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Actually, I have 3 pcs in my house and none of them is mine (they are my parents'). Sometimes, it is quite inconvinient for me to use their pc. So, I plan to install Win7 on an external hard-disk and run on their pc. However, two of the pc is 32-bit and another is 64-bit. So, I have to install 2 versions of Win7 to run on all the pcs. Besides, I am also using Ubuntu. – yihang Feb 26 '10 at 11:33
32 bit OSes run on 64 bit systems. As things go, it sounds like you might be better off running a single instance of windows 7 and using rdp to access it as things are. – Journeyman Geek Feb 27 '10 at 2:50
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Rather than explaining it here I wrote an entire guide for this... I just haven't updated it for win7, but it hasn't changed and most of it will be the same except for win7's "boot partition". You can either skip it entirely and have the boot files in the win7 partition you wish to boot or "multi-bootload" with a third party bootloader and then win7's boot loader for windows partitions.

I wealth of your "other" questions will be answered here too: http://www.defonso.com/clone

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