FCE/Disk space/external disk

[David Minard]

My son, having too much fun on his first FCE venture, has apparently 
run out of disk space (an 80 gb and a 20gb in a B+W G3 running 
Panther). He most certainly has lost his last render, since the message 
he gets is "Autosave error, no disk space". Question: can he move all 
his FCE files (clips, sequences, etc.) to a larger external drive and 
not wreck the project? And if so, what are the safest drives to get, 
given the Panther/external firewire issues of the last month or so?

Thanks very much in advance