How do i make an EFI system Partition

Discussion in 'MacBook Pro' started by brownamazingnes, Aug 6, 2013.

  1. brownamazingnes macrumors newbie

    Aug 6, 2013
    Today, I rebooted my 2009 Macbook Pro and I tried to bootcamp, when it said "The startup disk must be formatted as a single Mac OS Extended (Journaled) volume or already partitioned by Boot Camp Assistant for installing Windows." I went to disk utility to see if there was a problem, so I verified the disk. When I verified the disk, it said there was a problem in my partition map and "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."
  2. alex0002 macrumors 6502

    Jun 19, 2013
    New Zealand
    Make sure you backup your data before anything else.
    Can you show us you current partition table using "diskutil list" in the terminal, for example:
    $ diskutil list
       #:                       TYPE NAME                    SIZE       IDENTIFIER
       0:      GUID_partition_scheme                        *500.1 GB   disk0
       1:                        EFI                         209.7 MB   disk0s1
       2:                  Apple_HFS Macintosh HD            480.0 GB   disk0s2
       3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
       4:                  Apple_HFS newVolume               8.0 GB     disk0s4
    The partition type "EFI" is the EFI system partition, but there might be something wrong in your case. Your one will be a little bit different if you have attempted to install bootcamp.

    This thread on stackexchange might help:

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