[ubuntu] external HD have a size limit - ?

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http://ubuntuforums.org – I want to buy an external HD that is both firewire and USB 2. I know that when one puts an IDE HD in a desktop or laptop, one sometimes has limits by the hardware (say 500 gigs) as to how large of a HD a laptop/desktop will take. I would like to know if there is any limit on how large of an external HD in storage size to connect to any Ubuntu computer. If anyone knows of a good external firewire&usb HD to recommend, please do. (Hardware)