The ONE common denominator here is build 9879, I'd say Microsoft has done a major shift with this build, hence all the problems, they have even admitted to the problems. When I talk about trashing drives I don't particularly mean damaged beyond repair in all cases, but certainly severely damaged to the extent that a lot of people would throw out their drives.
I was going to take mine back and claim it under warranty, but having repaired hundreds if not thousands of computers and HDDS in the past, I pretty well knew I'd be able to breathe life into it again, which I did.
I was going to check out the error logs, but in the end couldn't be bothered and ended up removing the partitions and letting Windows 8.1 do its own partitioning and formatting.
Im not blaming Microsoft, they made us aware of the problems with this beta software. I'm just pointing out that this is not some failure of HDDs its 9879.