During this week beginning August 13, 2012 I’ve seen four Seagate 2.5″ hard drives fail. All of the drives except one are the 500gb size. The other one was a Seagate ST9640320AS 640gb 2.5″ . This is the first time I’ve ever come across a certain brand and size range fail in multiples all in a week. I will try to get the model numbers for you, but I believe they were all the Momentus model. Maybe it was a coincidence...