can't boot a Mint Cin 17.1 live Sandisk Ultra Fit 3.0 32GB

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.