I just got an external hard drive a couple of days ago and set up time machine. It took 3 tries for the initial back up to finish (it froze the first 2 times). Now about half the time it does it's hourly back-ups, time machine will freeze, and so will the finder. I've also had it freeze other applications such as Safari. Force quitting doesn't work, I have to do a hard restart. I verified the drive with disk utilities, and it said it was fine. I made sure the drive was set as directed by other posts. I have not gotten any error messages. Any help would be greatly appreciated.