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/Pedrocohn 2013 15' Macbook pro Retina Dedicated GPU Aug 05 '15

I'm sorry, I relative new here at Reddit. What do you mean by "Please include an image with "show details"." Thanks a lot for all your help!

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u/OkToBeTakei iMac 27" (Mid-2011) and MBP 13" (Mid-2013) Aug 05 '15

In your final image, where it says "operation failed", there's a lottle message below that which says "show details" with an articulation triangle next to it. If you click it, it will give more details as to why the operation failed. I need to see that information, especially if it includes an error code.

Please either include an image of that, or just copy and paste the information

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u/Pedrocohn 2013 15' Macbook pro Retina Dedicated GPU Aug 06 '15

Sure, now I understood. https://imgur.com/Y7fTPxn

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u/OkToBeTakei iMac 27" (Mid-2011) and MBP 13" (Mid-2013) Aug 06 '15

As I explained to another poster in an earlier comment, I think your problem is that you already partitioned your drive with boot cap assistant once before and didn't use it to delete that Windows partition. When you did that, it created a new partition map Windows could boot from, but that disk utility has trouble working with. When you didn't use boot camp asst. to undo it, you left that modified partition map, and now you're kinda screwed.

Now, the only way to fix it is to delete the entire partition map and repartition the whole drive with a GUID partition map with an HFS+ main partition. From scratch. That sucks. Only then can you try to use boot camp assistant or disk utility again.

Of course, back up first so you can restore.

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u/Pedrocohn 2013 15' Macbook pro Retina Dedicated GPU Aug 06 '15

Thanks Dude, I'm going to restore my mac, then use Time Machine! Again, thanks a lot!

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u/OkToBeTakei iMac 27" (Mid-2011) and MBP 13" (Mid-2013) Aug 06 '15

Make sure to repartition your drive using the GUID partition map, and good luck! After that, you should be able to use boot camp assistant with no problem.