I have been using a seagate that has been a real workhorse. I plugged this into my g4 and began backing up some simple jpeg files when it ceased talking to my computer,ceased copying, after half an hour still was stalled and my computer was locked up... after a restart i found it would not even turn OFF any more when I pushed the on/off button.Yes, I know one might need to hold the button down a few secs. I'm not a moron.It will not turn off, nor mount, not on my windows machine, not on a mac, not with a goat, not in a boat... It had previously made sounds when you turned it on, but now it's silent. For 8 hours service I'm not very happy.I am contacting WD about the warranty, so remains to be seen how they'll handle it. I'm just not very happy with my first WD product.