Can I Boot my PB from a Firewire 800 External HD?

I'm a going to buy a portable external HD for my mirror (clone) back-up drive.
I can buy either a Firewire 400 ("Combo case") or 800 ("Triple case") HD. My inclination is to buy the Firewire 800 ("Triple case") drive as it will be more useful in the future.
Will I be able to Boot my Firewire 400 PB from the Firewire 800 External HD as long as I have the right adapter cable? Or do I have to get a Firewire 400 instead?
The drives I have in mind come from OWC and have a port for an external power supply if it's needed.*
* http://eshop.macsales.com/shop/firewire/on-the-go, to see where I'm going with this.

Moot Question.... No further need to answer!!!

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[email protected]

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Can I boot my computer from an external hard drive

I have already used the (internal) hard drive to boot my computer. If it is bootable while outside the computer, that is only the (internal) hard drive being outside the computer running while the computer is on then I will buy an external herd drive enclosure so that it can do so.
I want to boot my computer using one of my internal hard drives using an external hard drive enclosure so that I do not wear out the the hard drive ports
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... that part is for using an internal hard drive and as I stated that is the one I am trying to avoid wearing by daily swapping. Not only is it an inconvenience to swap them, but it is not an activity that is usually expected to be performed by most users, so likely this part is not meant to be used for that and that would make it not built for multiple hard drives swaps making it prematurely wear out.
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http://www.amazon.com/SATA-Hard-Drive-Case-Enclosure/dp/B001AAVA08
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