USB to Firewire

Say somebody puts some footage onto an external hard drive and begins editing connected by a USB 2.0 port... could they then shut everything down and connect with a FireWire? Or must the project be started with FireWire to be worked on with FireWire?
Ham

Both firewire and USB are hot swappable...meaning they can be connected and disconnected whenever. I would say you need to eject the drive before removing it, but I don't understand your question entirely.
Are you saying you have the footage on two separate drives?
Are you saying its the same drive and just a different connection option?
If it's the latter, you should be able to eject the drive and then re-connect with Firewire and, since all the files are in the same place on the drive...re-open Final Cut and voila! It should work just fine. If not, you can always choose the reconnect media option in Final Cut.
I hope that helps a little
MacBook Pro 15in. w/2GB RAM   Mac OS X (10.4.9)   FCE HD 3.51 and LaCie 250GB D2 FW800 drive. FCE3.51.

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