How do i make an EFI system Partition

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

  1. brownamazingnes macrumors newbie

    Joined:
    Aug 6, 2013
    #1
    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

    Joined:
    Jun 19, 2013
    Location:
    New Zealand
    #2
    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:
    Code:
    $ diskutil list
    /dev/disk0
       #:                       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:
    http://apple.stackexchange.com/questions/57597/how-to-fix-broken-efi-partition
     

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