I recently bought the 2 TB Seagate GoFlex to use on my 2011 iMac for Time Machine. I have had NO luck with this drive. It will perform the initial TM backup and then quit after a few days. Disk Utilities will not repair and so I have to reformat and start over. I called Seagate (they recommended calling Apple) and then gave me reformatting advice - use GUID. I did what they said and it died again! I just reformatted and used Zero Out to really start from scratch. Not sure it will work this time but am about to give up! Any other suggestions?