Are you sure bro? I am using one now, 150gb. IMO I don't think it's fast. It perform more or less like a thumb drive speed only. I am very pissed with the original built in software as it is formatted as NTFS and only recognize by PC. When I plug in iMac, I am require to use the .dmg installer which I did and upon installing, everything seems fine but in MAC only! It's undetectable again when I switch back to PC!

The solution is to manually format it in MAC using the MAC disk utility making sure that it's formatted as FAT then only I can plug and play on both PC and MAC