Booting from ext drive

I used Super duper to make a backup on a estata drive. when starting MacBook pro how do I tell it to book from there. What is the key command etc...

> Yes I know that but what if my regular boot drive is down, corupted, etc... and will not boot?
Use Apple/Option at startup and it will find any available Boot volume
> For my processor intense stuff
It's not the processor really it's how fast it can write/read frames to/from the drive for stutter-free, high-res video capture/playback/editing. I've the opposite of your setup, internal is the fast 7200 100GB and the external 2.5" is a 5400 160GB (both Seagate). I only edit video on the internal and store/backup on the external.

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    ****Click the White thumb to say thanks****
    ****Please mark Accept As Solution if it solves your problem****
    ****I don't work for HP****
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