In my prior posts, I noted I had the same boot problem, and couldn’t full-format the drive. Also the drive was extremely hot. Same problem with 2 drives. I just exchanged the drives for 2 new ones. I still have the same problem booting Mint from an Ultra Fit – which is very disappointing. The overheating and full-format problems (in Windows) apparently have been fixed in new versions of this device, at least.