Now, I can't even get past the boot logo.

Formatting the whole drive probably won't gain you anything. This is a symptom of drive or cable trouble. Odds are, you didn't do anything wrong, and that there is something faulty inside the player causing all your problems. Until you solve the root cause of the problem, formatting the disks isn't going to help you. Please click here for information.

However, if you really need it, instructions for formatting the drives using the builder image can be found as part of the disk upgrade guide here.