...and given this comment from a search on the same topic:
"Note that while Windows XP and some other operating systems won't boot from an external drive"
...what operating systems besides DOS can I use on an external drive? Presumable Linux - any versions of Windows?
I have a 60gb bootable 2.5 drive in a suitable enclosure and a motherboard/bios that supports boot from usb. I'd like to use it as an emergency boot disk, with something more than DOS. Normally I install a Windows OS by creating a primary partition, making it active, and booting with a floppy. The new partition is now C: and ready for a fresh install. However with an external drive that won't work - a/the active partition on the internal master will be C:. So how do I install my OS? (Note, I also want this system to be bootable on any PC that supports boot from usb, so the installation has to be self-contained with no support from NTLDR or any existing OS.)
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