External Hard drives



Hi All,
This a very general question, so I hope it's the right forum. I have a PowerBook G3 with a hard drive that I think is about to fail-is it possible to use an external USB hard drive as the main drive (startup disk). I have a 30gb 3.5" IDE hard drive and I was going to buy a USB enclosure and use it with my PowerBook, but if I can't boot from it, I should really replace the internal drive-right?
Thanks in advance for any help


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