These drives are terrible. I will be returning this drive shortly to the Apple store where I bought it. Despite disk util saying nothing is wrong, it hangs FCP all the time, can no,t and randomly decides when it can be unmounted, spins down way to much causing problems and is is way too slow. Can not be daisy chained even with only one other FW800 drive (from a MacPro fully pimped out) tonnes of errors there that require rebooting in most cases. Very disappointed with this drive. When G Tech first came out they were good but their QC is terrible now. Previously I returned a GRaid 2TB as it had mechanical failures withing 2 weeks of operation. NOT good if you are making a living from being an editor. Who to trust?