EL CAPITAN-change hard drive in GUID Partition

I read the previous posts and utility assistance from disk on the evolution of the GUID to load El Capitan. To this day he used the Apple Partition map and trying to update I received the message GUID.

Unfortunately, the solutions do not work for me.

In disk utility, I can access the drive, then the Partition screen. I can create a new Partition in the Partition box and manipulate the size, but there is no way that I can turn on the Options button to choose the format GUID.

Any ideas?

You cannot change the plan of partition on an active system. You must boot from an alternative media (such as a USB key). Re-partitioning a disk is to erase all existing data. So be sure that you have a recent backup of all your apps important and files.

Tags: Mac OS & System Software

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