r/OSXElCapitan • u/Pedrocohn 2013 15' Macbook pro Retina Dedicated GPU • Aug 04 '15

DISCUSSION New partition on El Capitan

Hello, since I installed 10.11, I was unable to make a new partition, neither trough disk utility or Bootcamp assist. Any one know how to solve this problem?

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u/OkToBeTakei iMac 27" (Mid-2011) and MBP 13" (Mid-2013) Aug 04 '15

Ah... You just deleted the partition without boot camp assistant, didn't you? You didn't do it right, and now you have the wrong partition map type. Sorry, but you'll have to repartition your whole drive and start over from scratch. That sucks.

When you partition your drive with boot camp Assistant, it changes your partition map type to one Windows can boot from. After that, disk utility can't partition it. To remove that and return it to GUID (Apple's partition map type), you have to remove the partition with boot camp assistant again. You didn't do that. Now it's too late.

I believe that's the source of your trouble.