I am thinking of upgrading my hard disc in my iMac. What I want to do is buy an external USB/Firewire HD (400-500GB). I will then clone the internal disc to this then swap them over. My question is what is the hard disc interface in external drives? Obviously I need a drive that has a SATA interface so I can pop it back into the iMac once I'm done. Are the Lacie drives SATA? I can't find any info on their website that tells me.