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Boot Camp install of Win 7 TO USB external drive?

Hi,
I recently bought a 32 GB USB thumb drive. I was able to install a full copy of SL on the drive and use it to boot several different Macs in my household -- it's a little slow, but it works fine. The procedure was dead simple -- format the drive and away you go.

I cannot, for the life of me, figure out how to do the same thing with Boot Camp/Windows, i.e. install a copy of Windows on the USB thumb drive such that it will boot and run on a Mac.

I read somewhere else here that it isn't possible -- that Boot Camp can only run on an internal drive. I guess my question is: if all my Macs can install and boot OSX from an external USB drive, why isn't it possible to the same with Windows?

(As I type this it occurs that I didn't try booting the Mac from the USB drive, partitioning the thumb drive in Boot Camp and installing Windows from there. It would be pretty slow going, but maybe that's a solution?)

Thanks for any/all illumination!

MBA 1.86/SSD, 20" iMac G5, 15" MBP Santa Rosa, iPhone 8GB, Mac OS X (10.6.1)

Posted on Sep 25, 2009 4:26 AM

Reply
4 replies

Sep 25, 2009 5:13 AM in response to dbs

Hi dbs,

by design courtesy of Microsoft Windows is not meant to be installed on external devices (harddisks or USB-sticks).
Apple just strictly accepts this rule.

However, there are solutions to be found on the internet for installing Windows XP and/or Vista onto external devices, so it might only be a matter of time before a solution for W7 is out.

Sep 25, 2009 3:02 PM in response to The hatter

From my days using ThinkPads (long, long ago) I remember doing flash updates to the BIOS. The updates came from IBM, not Microsoft (so I assume the BIOS was hardware-based, not software (i.e. Windows o/s) based.

That suggests (to me, anyway!) that something in the Mac motherboard prevents installing Windows on an external drive (but allows OSX to be so-installed).

I've also read the Macs use "open firmware" instead of BIOS and that open firmware is, to some degree, programmable (as in programmable to allow Win to boot from a USB drive).

Am I on the right track or am I completely, totally, wrong?! (I'm 'way over my head here).

Boot Camp install of Win 7 TO USB external drive?

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