On an impulse last night I bought on eBay a USB enclosure that is sized to hold 2.5" IDE harddrives. These drives of course are the size one uses in a Powerbook. I want to use it for portable back up and file transfer via some new USB 2.0 ports I've added to my G4-400 desktop system. Is it safe to assume that any drive that gets good marks on xlr8yourmac.com for use in a Powerbook (like an IBM Travelstar) will operate satisfactorily in a USB enclosure? John G4-400 AGP OS-X 10.2.8