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

[sgunes]

I have a 15 inch rMBP with 256GB SSD running 10.8.2.
It is formatted (from the factory) as one partition.
I ran the bootcamp assistant to make a partition for Windows 7 but was stopped cold with this error message:
The startup disk cannot be partitioned or restored to a single partition.

Looking in disc utility, the startup disc is actually only a single partition (MAC OS Extended (Journaled)).

I searched google and this forum with the error message and did not get anywhere. This is a "virgin" rMBP and I have not changed any partitions on it. Why would it not allow me to get bootcamp working?

Bootcamp worked very well on my 13" MBA 2011.

Any help would be appreciated.

 

[MJL]

I recently bought a Mac mini and it was partitioned MBR and the latter will give the above error message.

Go into disk utility and check if the disk is partitioned using GUID.

If it is MBR then you'll need to make a backup with Time machine and afterwards boot from the time machine backup and use the disk utility to change it before doing the restore.