Sorry I should have been more clear. I was meaning using the Apple USB SuperDrive with a Mac that already has a internal DVD drive. I'm sure I read that on these forums somewhere that it wouldn't work, I'm sure I read also that you can use the USB SuperDrive with a Mac that has an internal drive if the internal drive is not working. I could be wrong has I know very little about Macs presently : )
On the subject of external dvd drives, Ive been looking around for suitable external DVD drives for when I get my iMac. I couldnt really see any 5.25 inch mains powered ones here in the UK. I could find one on the LaCie site but it is a Blu Ray/cd/DVD burner and is expensive.
A lot of other mobile/portable DVD drives I've looked at have a twin ended USB cable, and a lot of the reviews I read on them mention the need to have both ends plugged into two USB ports for them to get the required power needed. I don't want to use two ports up with one device. With looking at the Apple USB SuperDrive, this only has one USB connector, so this would probably be the best choice for me if I couldn't find a 5.25 mains powered external DVD drive.
Thanks for the help its appreciated.