I used the Migrate OS to SSD 4.0 to clone a smaller SSD (Samsung) 128g to a Sandisk 240g SSD. The program said it completed successfully. It renamed my new drive C and it booted fine. I went in to the bios and had the new drive boot first, but after using MInecraft or watching you tube videos for over 20 min., the whole PC crashes and shuts down. Sitting idle, the PC won't crash. I'm running Windows 7. I tried re-cloning, but I getting the same result.