Can't Boot Mac OS X After Attempting to Shrink W8 Partition

Discussion in 'Windows, Linux & Others on the Mac' started by patrickgmaris, Jun 1, 2015.

  1. patrickgmaris, Jun 1, 2015
    Last edited: Jun 1, 2015

    patrickgmaris macrumors newbie

    Joined:
    Nov 15, 2013
    #1
    Well...

    I royally messed up on this one. I needed some extra space on my Mac HD so I booted into W8 and shrank the volume. Then I tried booting into OS X and when holding option at start-up the only drive found is bootcamp. I went back into W8 and extended the volume to the previous size. I realize why this happened, but I'm not sure how to restore my changes. I should have used a proper application rather than try to do it manually.

    Anyways, after scouring the internet for a solution for 3 hours, I only found solutions to other problem which is usually where the user cannot boot into BootCamp.

    I ran the following commands after booting into Internet Recovery

    Code:
    fdisk /dev/disk0
    Disk: /dev/disk0    geometry: 60821/255/63 [977105060 sectors]
    Signature: 0xAA55
             Starting       Ending
    #: id  cyl  hd sec -  cyl  hd sec [     start -       size]
    ------------------------------------------------------------------------
    1: EE 1023 254  63 - 1023 254  63 [         1 -  977105059] <Unknown ID>
    2: 00    0   0   0 -    0   0   0 [         0 -          0] unused 
    3: 00    0   0   0 -    0   0   0 [         0 -          0] unused 
    4: 00    0   0   0 -    0   0   0 [         0 -          0] unused
    Code:
    gpt -r -vv show disk0
    gpt show: disk0: mediasize=500277790720; sectorsize=512; blocks=977105060
    gpt show: disk0: PMBR at sector 0
    gpt show: disk0: Pri GPT at sector 1
    gpt show: disk0: Sec GPT at sector 977105059
          start       size  index  contents
              0          1         PMBR
              1          1         Pri GPT header
              2         32         Pri GPT table
             34          6   
             40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
         409640  779296896      2  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
      779706536    1269536      3  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
      780976072         56   
      780976128  196126720      4  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
      977102848       2179   
      977105027         32         Sec GPT table
      977105059          1         Sec GPT header
    EDIT:
    EDIT2:
    ANY help will be greatly appreciated.

    Worse comes to worst... I can wait till I get home and do a time machine backup after wiping the HD clean and start over. I have been traveling for a few weeks, made a backup before I left, and now i'm at home in Germany. Haven't done too much since then - just transferred over some photos and did some edits which I should be able to copy off from W8 before doing anything.
     
  2. Altemose macrumors G3

    Altemose

    Joined:
    Mar 26, 2013
    Location:
    Elkton, Maryland
    #2
    To my knowledge, you should only ever resize partitions on a Mac using Disk Utility under OS X. I am not sure however if it can resize a Windows partition. Resizing a partition within Windows likely destroyed the necessary boot information for OS X and likely will require a reinstall. Perhaps others can chime in before you try such a daunting task.
     
  3. yjchua95 macrumors 604

    Joined:
    Apr 23, 2011
    Location:
    GVA, KUL, MEL (current), ZQN
    #3
    You can't resize a Boot Camp partition.

    The only thing you can do is to use WinClone to make an image of your Boot Camp partition, remove Boot Camp and restore it to a single partition, and create a new larger partition using Boot Camp assistant. Then, use WinClone to restore the backup image back to the new larger partition.
     
  4. patrickgmaris thread starter macrumors newbie

    Joined:
    Nov 15, 2013
    #4
    Thanks for answers Altemose and jychua95, the damage was already done.

    Not much on the Boot Camp partition so I'm not worried about losing it.

    I just want to be able to boot back in OS X. Any knowledge?

    Will deleting the windows partition do anything substantial? I know the correct procedures for resizing boot camped partitions now.
     
  5. yjchua95 macrumors 604

    Joined:
    Apr 23, 2011
    Location:
    GVA, KUL, MEL (current), ZQN
    #5
    Boot into Recovery and reinstall OS X.
     
  6. patrickgmaris thread starter macrumors newbie

    Joined:
    Nov 15, 2013
    #6
    Thats the easy way out. Like I said in my post. Going to get a some cable and adaptors so that I can put my mbp into TDM and see if I can do anything. Need a few files from the recent trip before I can wipe it clean.
     
  7. Altemose macrumors G3

    Altemose

    Joined:
    Mar 26, 2013
    Location:
    Elkton, Maryland
    #7
    Reinstalling OS X keeps data in place and simply replaces the system files. You should try and backup any files before attempting though...
     

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