arrwhieayen
Level 1 (0 points)

Q: Disk utility repair made Bootcamp partition innacessable.

My MBP running 10.9.5 was having issues starting up. I booted into recovery and used Disk Utility to repair my disk. Can boot into OS X just fine now, but when I hold alt/ option to get boot options for Bootcamp, Windows partition no longer is available.

 

When I boot into OS X I can see my partition and access the files, I'm guessing Disk Utility removed the boot partition or some such thing.

 

Any help would be appreciated!

MacBook Pro, OS X Mavericks (10.9.5), Bootcamp with Windows 7

Posted on Dec 8, 2015 10:02 AM

by Loner T,Solvedanswer
Loner T Loner T
Level 7 (24,738 points)
Safari
A:

If this disk was part of another system or had OS X on a different disk, that may explain Recovery HD missing from this disk. Usually in step 6, there are three numbers. The missing Recovery means you have only 2, which are GPT2 and GPT3 respectively.


Rebuild MBR to match the new GPT information thus resetting the Hybrid MBR. Use defaults for other questions (like partition codes). The only values that need modifications are the Boot flags and step 10. Accept all other defaults that Gdisk offers. Please see the sample Q&A as an example. These steps can be repeated if you make a mistake before you get to Step 12, otherwise start from Step 1 for these steps. Step 6 has numbers which are typed with a space between the numbers. Please see the sample Q&A before you execute these steps.


  1. Sudo gdisk /dev/rdisk0
  2. P  (Print list of parts)
  3. R  (Recover)
  4. O (print current Hybrid MBR)
  5. H (chooses Hybrid)
  6. Partitions numbers to be hybridized: 2 3
  7. Y  (Good for GRUB question)
  8. N  (part 2 boot flag)
  9. Y  (part 3 boot flag make NTFS bootable partition)
  10. O  (print current Hybrid MBR)
  11. W (Write the new MBR)
  12. Y (Yes! write the new MBR)
  13. Reboot

 

Here is sample Q&A for this section. Please notice the Press Enter/Return.

 

Place EFI GPT (0xEE) partition first in MBR (good for GRUB)? (Y/N): Y

 

Creating entry for GPT partition #2 (MBR partition #2)

Enter an MBR hex code (default AF): Press Enter/Return

Set the bootable flag? (Y/N): N

 

Creating entry for GPT partition #3 (MBR partition #3)

Enter an MBR hex code (default 07): Press Enter/Return

Set the bootable flag? (Y/N): Y

 

Test 1 - Does Bootcamp Volume show up in Finder?

Test 2 - Can you see files in Bootcamp Volume?

Test 3 - Can you select Bootcamp in System Preferences -> Startup Disk?

Test 4 - If Test 3 is successful, select Bootcamp and Click Restart.

Posted on Dec 8, 2015 3:00 PM

Close
arrwhieayen

Q: Disk utility repair made Bootcamp partition innacessable.

  • All replies
  • Helpful answers

Previous Page 2

  • by Loner T,

    Loner T Loner T Dec 8, 2015 2:44 PM in response to arrwhieayen
    Level 7 (24,738 points)
    Safari
    Dec 8, 2015 2:44 PM in response to arrwhieayen

    The 'y' was unnecessary, but this looks good. Write it - 'w' and confirm 'y'.

  • by arrwhieayen,

    arrwhieayen arrwhieayen Dec 8, 2015 2:59 PM in response to Loner T
    Level 1 (0 points)
    Dec 8, 2015 2:59 PM in response to Loner T

    This worked! You are a baller of the highest accord.

     

    If anyone at Apple is reading this... hire this wo/man!

     

    Thank you so much!

  • by Loner T,

    Loner T Loner T Dec 8, 2015 3:00 PM in response to arrwhieayen
    Level 7 (24,738 points)
    Safari
    Dec 8, 2015 3:00 PM in response to arrwhieayen

    Glad to see it working. Please backup OSX, Windows and create a Windows System Restore point. This will help when you need any recovery in the future.

  • by arrwhieayen,

    arrwhieayen arrwhieayen Dec 8, 2015 3:22 PM in response to Loner T
    Level 1 (0 points)
    Dec 8, 2015 3:22 PM in response to Loner T

    Will do.

     

    Thanks again!

  • by SomeGuyInOz,

    SomeGuyInOz SomeGuyInOz Jul 3, 2016 5:08 AM in response to Loner T
    Level 1 (4 points)
    Jul 3, 2016 5:08 AM in response to Loner T

    You are absolutely fantastic!  Thank you so much for this solution!  I had a very similar problem and used your solution to repair my Bootcamp partition.  For step 6 I had to use "2 4" instead of "2 3", because of the way my partitions were...  Maybe that should have been "2 3 4"??  But nonetheless I now can boot into either Mac or Bootcamp!

     

    When I boot using the Alt/Option key, I have Mac, EFI boot and Windows listed.  I am guessing that I should have Recovery in place of EFI, so maybe I didn't do this totally correctly.  Hopefully this won't cause any probs in future, but for now it works great! :-)  If anyone know if or how I should correct this, please let me know.

     

    Oh, btw, before I did any of this I had to turn off the "rootless".  So I did that, and re-enabled it after I had finished:
    https://www.quora.com/How-do-I-turn-off-the-rootless-in-OS-X-El-Capitan-10-11

     

     

    Here's what I did:

     

    sudo gdisk /dev/rdisk0

    GPT fdisk (gdisk) version 1.0.1

     

    Warning: Devices opened with shared lock will not have their

    partition table automatically reloaded!

    Partition table scan:

      MBR: protective

      BSD: not present

      APM: not present

      GPT: present

     

    Found valid GPT with protective MBR; using GPT.

     

    Command (? for help): p

    Disk /dev/rdisk0: 937703088 sectors, 447.1 GiB

    Logical sector size: 512 bytes

    Disk identifier (GUID): E4C92C97-8BA9-4B97-82C7-E7FCCB948C40

    Partition table holds up to 128 entries

    First usable sector is 34, last usable sector is 937703054

    Partitions will be aligned on 8-sector boundaries

    Total free space is 3149 sectors (1.5 MiB)

     

    Number  Start (sector)    End (sector)  Size      Code  Name

      1              40          409639  200.0 MiB  EF00  EFI System Partition

      2          409640      543855399  259.1 GiB  AF00  Untitled

      3      543855400      545124935  619.9 MiB  AB00  Recovery HD

      4      545126400      937701375  187.2 GiB  0700  BOOTCAMP

     

    Command (? for help): r

     

    Recovery/transformation command (? for help): o

     

    Disk size is 937703088 sectors (447.1 GiB)

    MBR disk identifier: 0x6C4A997C

    MBR partitions:

     

    Number  Boot  Start Sector  End Sector  Status      Code

      1                    1    937703087  primary    0xEE

     

    Recovery/transformation command (? for help): h

     

    WARNING! Hybrid MBRs are flaky and dangerous! If you decide not to use one,

    just hit the Enter key at the below prompt and your MBR partition table will

    be untouched.

     

    Type from one to three GPT partition numbers, separated by spaces, to be

    added to the hybrid MBR, in sequence: 2 4

    Place EFI GPT (0xEE) partition first in MBR (good for GRUB)? (Y/N): y

     

    Creating entry for GPT partition #2 (MBR partition #2)

    Enter an MBR hex code (default AF):

    Set the bootable flag? (Y/N): n

     

    Creating entry for GPT partition #4 (MBR partition #3)

    Enter an MBR hex code (default 07):

    Set the bootable flag? (Y/N): y

     

    Unused partition space(s) found. Use one to protect more partitions? (Y/N): n

     

    Recovery/transformation command (? for help): o

     

    Disk size is 937703088 sectors (447.1 GiB)

    MBR disk identifier: 0x6C4A997C

    MBR partitions:

     

    Number  Boot  Start Sector  End Sector  Status      Code

      1                    1      409639  primary    0xEE

      2                409640    543855399  primary    0xAF

      3      *      545126400    937701375  primary    0x07

  • by SomeGuyInOz,

    SomeGuyInOz SomeGuyInOz Jul 3, 2016 5:07 AM in response to arrwhieayen
    Level 1 (4 points)
    Jul 3, 2016 5:07 AM in response to arrwhieayen

    -

Previous Page 2