Summary: I purchased this drive in August 2012. I had issues from the start, sometimes the Thunderbolt port would not work at all. The drive would not mount on my Mac about 85% of the time when using Thunderbolt. Using USB 3.0 it worked fine until the end of September 2012. The disk would not mount using USB 3.0 or Thunderbolt. Desperate to get to my data I opened the drive and inserted the hard disk into an external enclosure I had laying around.
Summary: [EDIT:] The BUFFALO MiniStation 500 GB Thunderbolt/USB 3.0 Portable Hard Drive has failed. I have adjusted the review rating to reflect my poor experience with the defective product, and the lack of an acceptable avenue for resolving problems. I have bought and used dozens of drives over the years, and I know failures occur with every manufacturer (I have never come across a total failure myself), so maybe I just got a dud.