Resolved Resizing and Adding Partition Killed Windows 7 Bootcamp Partition

Discussion in 'Windows, Linux & Others on the Mac' started by owntheweb, Feb 7, 2015.

  1. owntheweb, Feb 7, 2015
    Last edited: Feb 7, 2015

    owntheweb macrumors newbie


    Feb 7, 2015
    Hello Mac Gurus,
    Once upon a time a year or so ago I installed Windows 7 on a Bootcamp partition with the help of my IT team. It was a smaller partition as I was only planning to use windows for my music composition software that required it... I didn't realize how much space Windows 7 required (what a hog!) and drive space was limited. After installing a video game recently (also a medium sized porker), I decided to to add some space.

    Uh oh! :mad:


    Using Mac Disk Utility, I reduced my Mac partition and added another MS-DOS (FAT) partition in hopes of making another write access drive accessible to Windows. This resulted in Bootcamp no longer being a bootable option (holding down option key when booting - drive not visible). I can still access my files via Mac and have backed everything up.

    I just hope not to reinstall Windows as the music software is finicky and takes FOREVER to download. It's also tricky as I purchased a CD... and don't have a CD drive... and don't want to upgrade to the new online subscription version just yet.

    Mac Info: MacBook Pro (Retina, Mid 2012)
    Running: OS X Yosemite 10.10

    Reading similar posts from two years ago, I figured I should post something new. To speed things up based on those posts, I ran this command:

    sudo gpt -r -vv show disk0
    It resulted in this:

    gpt show: disk0: mediasize=500277790720; sectorsize=512; blocks=977105060
    gpt show: disk0: Suspicious MBR 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         MBR
              1          1         Pri GPT header
              2         32         Pri GPT table
             34          6         
             40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
         409640  486328120      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
      486737760    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
      488007296        384         
      488007680  234964992      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
      722972672  254132224      5  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
      977104896        131         
      977105027         32         Sec GPT table
      977105059          1         Sec GPT header
    I ran this command:

    sudo 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 -     409639] <Unknown ID>
     2: AF 1023 254  63 - 1023 254  63 [    409640 -  486328120] HFS+        
     3: AB 1023 254  63 - 1023 254  63 [ 486737760 -    1269536] Darwin Boot 
     4: 0B 1023 254  63 - 1023 254  63 [ 488007680 -  234964992] Win95 FAT-32
    I installed this:

    Then ran this:

    sudo gdisk -l /dev/disk0

    GPT fdisk (gdisk) version 0.8.10
    Warning: Devices opened with shared lock will not have their
    partition table automatically reloaded!
    Partition table scan:
      MBR: hybrid
      BSD: not present
      APM: not present
      GPT: present
    Found valid GPT with hybrid MBR; using GPT.
    Disk /dev/disk0: 977105060 sectors, 465.9 GiB
    Logical sector size: 512 bytes
    Disk identifier (GUID): 00006089-5C8B-0000-1202-00008B620000
    Partition table holds up to 128 entries
    First usable sector is 34, last usable sector is 977105026
    Partitions will be aligned on 8-sector boundaries
    Total free space is 521 sectors (260.5 KiB)
    Number  Start (sector)    End (sector)  Size       Code  Name
       1              40          409639   200.0 MiB   EF00  EFI system partition
       2          409640       486737759   231.9 GiB   AF00  Customer
       3       486737760       488007295   619.9 MiB   AB00  Recovery HD
       4       488007680       722972671   112.0 GiB   0700  THE FAT
       5       722972672       977104895   121.2 GiB   0700  BOOTCAMP
    I'm going to go for a walk now and will not destroy anything else...

    Any thoughts on how I should proceed to fix my Windows partition? I truly appreciate the feedback in advance! :)
  2. maflynn Moderator


    Staff Member

    May 3, 2009
    Well it may or may not be too late, but I recommend the use of Winclone, which backs up your bootcamp partition. Always have a backup before doing any partition work (including your OS X partition).

    Secondly, did you try undoing your steps, i.e., remove the FAT partition and resize the OSX partition back to what it was?
  3. owntheweb thread starter macrumors newbie


    Feb 7, 2015
    Hello maflynn,
    Thanks for the quick response! :D

    I should have known better before mucking around with partitions.

    Sadly no WinClone. I do keep my Mac backed up via Time Machine and Time Capsule. Windows is being left out, using basic S3 services to keep important files there backed up (but not OS). I do have access to my separate work MacBook which has helped me in restoring files when my Time Machine backup wasn't fully recognized (that's another long story that ended well).

    I did attempt to remove the extra partition and resize the Mac partition. There was some extra empty space there that I tried to approximate. No luck, and I didn't recall the original exact size.

    Another related post I'm looking into that gives me hope (not understanding everything here just yet):
  4. owntheweb thread starter macrumors newbie


    Feb 7, 2015
    Fixed it!

    I followed the steps here:

    Windows is bootable once again. Whoohoo!

    Now to the next challenge: Seeing my Mac partition (new: lost it) again in Windows, and also seeing the new FAT partition there. I'll post separately if I get stuck. ;)

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3 February 7, 2015