How come I keep getting a message when trying to setup boot camp that says startup disk cannot be partitioned?

by on December 31, 2011

Q: When i try to Boot camp my mac i get the error message saying

“The startup disk cannot be partitioned or restored to a single partition. The startup disk must be formatted as a single Mac OS Extended (journaled) volume or already partitioned by Boot Camp Assistant for installing Windows”

I have already checked to make sure that my disc is not already partitioned and it is not. I have done the same steps on my other MacBook and it worked fine so i do not know what is going on with this computer.

Any help would be appreciated.
Thanks