This disk doesn't contain an EFI system partition. If you want to start up your computer with this disk or include it in a RAID set, back up your data and partition this disk.

As stated above. I get this when I try to resize my HD. Was having issues with BootCamp so I removed it and got this.
This disk doesn’t contain an EFI system partition. If you want to start up your computer with this disk or include it in a RAID set, back up your data and partition this disk.

the same problem...
any help?

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