Q: The startup disk cannot be partitioned or restored to a single partition.

Hello BACarson13,

I apologize, I'm a bit unclear on your exact question, but if you are getting this alert message ("The startup disk cannot be partitioned or restored to a single partition."), you may find the information and steps outlined in the following article helpful:

Boot Camp: Partition alert message when using Boot Camp Assistant - Apple Support

Sincerely,

- Brenden