Hi I've been sent some video (on an external HDD) which I need to edit and create into a DVD (156GB unedited video) - obviously there isn't enough space on my laptop to download and edit all of this. I was hoping that I would be able to work on it section by section (deleting what I didn't need as I went along), but this doesn't seem to be the case, so I was then hoping to be able to work directly from the external HDD. I've found the drive, but it has a little exclamation mark (like here http://www.unlockingimovie.com/2009/06/quick-tip-external-hard-drives-and.html) next to it..... is my only option to to copy the data elsewhere, reformat the external drive and copy it back. Even if I do this, will I be able to work on the data directly from the external drive in iMovie - it is a usb 2.0 connection and a Western Digital external drive - will the connection be fast enough? I hope this makes sense - I'm a recent PC convert, but I'm working to a tight schedule on this project Thanks for any help!