Macintosh HD is erased. HELP!!!

Discussion in 'OS X Yosemite (10.10)' started by shahin90, Feb 8, 2015.

  1. shahin90, Feb 8, 2015
    Last edited: Feb 8, 2015

    shahin90 macrumors regular

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    #1
    Hey guys,

    I was trying to format OS X because firevault encryption was paused thanks to Yosemite...Anyways, I think I have f'ed up and all I see in disk utility after booting using CMD+R is this:
    [​IMG]

    There is no partition and there is no way to add one. I can not install a new version of OS X or do anything because there is no disk.

    By the way, recovery HD is also locked also when trying to install through that.

    What should I do???

    Thanks!
     

    Attached Files:

  2. AppleNewton macrumors 68000

    AppleNewton

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  3. shahin90 thread starter macrumors regular

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    #3
    Yes. It says disk is okay. This is a brand new rMBP and I really doubt there is a hardware failure.
     
  4. AppleNewton macrumors 68000

    AppleNewton

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    #4
    the point of that is to allow disk utility to make the disk functional again.

    do you know if you were in Internet recovery? did it ask you to connect to Wi-Fi during the Recovery restart?

    I'd try to force an Internet recovery command option r
    http://support.apple.com/en-us/HT4718

    and see if that disk utility can just erase the disk
     
  5. simonsi macrumors 601

    simonsi

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    #5
    Its a Core Storage volume so Disk Utility can't manage your partitions. I had the same when FV2 hung on mine, full format and reinstall (then revert the Core Storage back to HFS), worked for me. You can see at the bottom of the screenshot they "Type" is Logical Volume Group - ie Core Storage.

    For me I booted off a pre-made USB installer made with DiskmakerX, formatted etc from there...
     
  6. shahin90 thread starter macrumors regular

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    #6
    I tried internet recovery using command+option+R and the same thing happens. I get to the OS X utilities page and I have the option to go to disk utility/Reinstall OS X/Get Help Online/Restore From Time Machine.

    And the same thing happens in Disk Utility. There is no partitions under Macintosh HD. Basically there is no startup disk and no where to install OS X using any method.

    ----------

    I have an extra 32GB USB. Right now I inserted that and I am installing OS X Yosemite on the USB stick based on what you said.

    What is next? How do you format the internal hard drive then?

    Cheers!
     
  7. simonsi macrumors 601

    simonsi

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    #7
    You will need to be booted off a volume other than the Macintosh HD volume in order to format it.
     
  8. shahin90 thread starter macrumors regular

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    #8
    This is great...5 hours to download additional components onto the USB and going up...
     
  9. simonsi macrumors 601

    simonsi

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    #9
    Boot from the USB, then DU run from the USB should give you an option to format/partition, then run the Yosemite installer.

    Once installed I ran the Core Storage revert commands to change it back to "normal" storage.

    This thread has the revert commands to run.

    ----------

    Bummer, still its too late for me to tell you to make a USB with DiskmakerX beforehand :(
     
  10. shahin90 thread starter macrumors regular

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    #10
     
  11. simonsi macrumors 601

    simonsi

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    #11
    Not that I know of but you basically boot off the USB, then run DU to format the target drive, then run the installer and install OSX.

    Get OSX installed first, we can worry about reverting the Core Storage later - but don't run Filevault again until reverted.
     
  12. shahin90 thread starter macrumors regular

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    #12
    I'm kind of confused. How can I boot off the USB? You mean install Yosemite on the USB and then boot off that? Or boot off an empty USB?
     
  13. simonsi macrumors 601

    simonsi

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    #13
    Download DiskmakerX from here

    When you run it it should find your Yosemite installer file you also downloaded. It will then make a bootable USB drive on your 32GB USB stick.

    Then boot off that USB, then you can run Disk Utility and format your mac drive, then you can run the Yosemite installer app on the USB stick and install Yosemite onto your Mac drive, when complete you can restart off the internal drive.
     
  14. shahin90 thread starter macrumors regular

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    #14
    I now booted from the USB and have a disk utility menu, but is identical to the DU menu if I boot into the internal drive. There is still no way to format the internal SSD...
     
  15. simonsi macrumors 601

    simonsi

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    #15
    In that case follow the commands in the thread I linked to to delete the Core Storage Volumes. You would still need to be booted from an external disk or USB so nothing wasted so far.

    Go into Terminal and run:

    diskutil cs delete disk1

    That should remove Core Storage, then you can select the drive with DU and partition as normal.

    Its nearly midnight here so I'll sign off, more info in that thread I linked to...
     
  16. shahin90 thread starter macrumors regular

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    #16
    You are awesome!!! It got fixed doing what you said!

    Thank you <3
     
  17. simonsi macrumors 601

    simonsi

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    #17
    Glad to help.
     

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