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Made a mess of my partition scheme

725 Views 14 Replies Latest reply: Dec 20, 2012 2:45 AM by Shootist007 RSS
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Dec 19, 2012 1:54 PM

I had just received my new late 2012 iMac, and transferred over all the information from my old iMac to the new one via Setup Assistant.


I went into Disk Utility to take a look at my Time Machine backup and noticed what seems to be a huge mess in the man hard drive.


I stupidly then attempted to erase the disk2s1 and the disk1s1 partitions, and then allocate that space back into the Macintosh HD, which didn't work (and now they are just empty volumes).


This is what I get in Terminal running the diskutil list command:


That being said, Find My iMac is now greyed out, and the Recovery HD (while bootable) doesn't seem to be recognized properly for iCloud and Filevault settings, etc.



Thank you very much for your help!



P.S. I also get "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." when trying to repair disk.


This applies to both “APPLE HDD ST3000DM001 Media” as well as “APPLE SSD SM128E Media”.

iMac (27-inch, Late 2012), OS X Mountain Lion (10.8.2), 3TB Fusion Drive
  • Shootist007 Level 6 Level 6 (16,640 points)

    You will need to boot the system from the Online/Internet Recovery system and Re-Partitoin that drive. If it is a Fusion drive you may need to break it up (or it is already broken).


    To use the Online/Internet Recovery system at startup hold down the Command+Option+r keys until you see a Spinning Globe in the center of the screen. Have the system Wired to your internet router.

  • Shootist007 Level 6 Level 6 (16,640 points)

    The Local Recovery HD is on the Local drive. The Local drive is Messed Up.


    You can Not Partition the Local drive while you are Booting the computer from the Local drive. You need and external source to boot from to partition the internal/Local drive.

  • Shootist007 Level 6 Level 6 (16,640 points)

    You can not Re-Alocate anything. You need to Re-Partition and Reinstall OS X.

  • Shootist007 Level 6 Level 6 (16,640 points)

    You might be better off going to your local Apple store and have them handle it. Not sure but sometimes when Apple comes out with new system they have a Special Build of the current version of OS X that you as a user can not get to. This happened with the Retina models and the only way to reinstall OS X was to take the system to Apple.

  • Radiation Mac Level 5 Level 5 (4,630 points)

    No.  There is no way to repartition and reinstall from the corrupted local disk.  You at this point absolutely require an external source.

  • Shootist007 Level 6 Level 6 (16,640 points)

    Did you even bother to Read my post about the Online/Internet Recovery System?


    And No you can not Re-Partition the drive While you are booting the computer from that same drive.

    iTunes can\'t import .txt? wrote:


    Is there any way to re-partition it through the local disk? I do not have an external boot source for this.

  • Shootist007 Level 6 Level 6 (16,640 points)

    Good Luck. And let us know.

  • Shootist007 Level 6 Level 6 (16,640 points)

    The Scheme of your hjard drive has nothing to do with it. Internet/Online recoivery Boots the computer from Over the Internet.


    Is the system connected to your internet router with an Ethernet cable? If not please connect it then restart/Start the system and hold down the Command+Option+r keys until you see a Spinning Globe in the center of the screen. You Hold the keys down until you see that globe. Do not let them up until you see the globe.

  • Shootist007 Level 6 Level 6 (16,640 points)

    You Broke the Fusion drive, which is what I stated in an earlier post. There is only one thing to do and that is to completely break up the Fusion driver into two completely separate drives, SSD and Mechanical Hard drive, then try to Re-Create it.


    If you do a Google search there are articles on breaking up fusion and re-creating it. You will need to follow one of those to get it back. Or use it as two independent drives/partitions.


    Then Do NOT try to Partition it again. A Fusion Drive is a Combination of two physical drives and Can NOT be partitioned any other way then One Large, Combined, Drive/volume.

    Or you can leave them as 2 separate drives/volumes and then you can partition either any way you want.


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