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Boot Win 7 From External HD

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I have 64-bit Win 7 on a Dell Studio XPS 9000. I used the ATHI2010 recovery environment for a system disk backup, stored on an external HD. I did a test recovery, using the rescue media, to another external HD. This also was successful. As a further check, I tried booting the computer from the external HD containing the recovered system disk. This didn't work. Windows started to load then stopped. Is there a reason why Win 7 can't be started from an external HD? Thanks.

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Thanks MudCrab. My external is USB, so you have answered my question. I wondered why the User's Guide encouraged doing a test recovery to a spare external HD but never suggested trying to boot from it. I'll try this with an external eSATA drive. Regards, -TT