Bx029297

Q: Issues with hybrid mbr and bootcamp partition

HI, i'm trying to install windows 7 via bootcamp on Mac Os x and created 2 additional partitions.

created the bootcamp partition with bootcamp assistant.

Then while bootcamp was partitioning hit the eject key and to eject the windows installation DVD and quit installation

Went to Disk Utility and created 2 more partitions LINUX SWAP and Ubuntu.


so i understand that the gpt side was created but not the mbr


this is the output of sudo gpt -vv -r show /dev/disk0 :


gpt show: disk0: mediasize=320072933376; sectorsize=512; blocks=625142448

gpt show: disk0: PMBR at sector 0

gpt show: disk0: Pri GPT at sector 1

gpt show: disk0: Sec GPT at sector 625142447

      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  136718744      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

  137128384    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

  138397920   11718744      4  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

  150116664     262144        

  150378808  136221984      5  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

  286600792   45156776        

  331757568  293384192      6  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

  625141760        655        

  625142415         32         Sec GPT table

  625142447          1         Sec GPT header

 

how to i create the hybrid mbr before installing windows 7?

Posted on Jul 6, 2014 5:54 AM

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Q: Issues with hybrid mbr and bootcamp partition

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  • by Loner T,

    Loner T Loner T Jul 7, 2014 9:41 AM in response to Bx029297
    Level 7 (24,770 points)
    Safari
    Jul 7, 2014 9:41 AM in response to Bx029297

    Good to see it work.

  • by Christopher Murphy,

    Christopher Murphy Christopher Murphy Jul 7, 2014 10:22 AM in response to Bx029297
    Level 3 (555 points)
    Jul 7, 2014 10:22 AM in response to Bx029297

    this was definitely not easy to achieve.

     

    It's why I discourage it and recommend VMs or other hardware (dedicated hardware). The current state is working but it's so fragile that even Apple tools including the OS upgrade installer, will break it. Not might. Will. So you may want to write up a cheat sheet on how to recreate the hybrid MBR and spread copies of it everywhere so that you have access to it in the face of an unbootable system. Typically the GPT is not what breaks, but rather the hybrid MBR. However, since Windows booted CSM-BIOS mode ignores both the primary and backup GPTs, it's possible for one or both to become broken. We really only find a way out of this complexity once Apple moves to the minimum UEFI spec supported by Windows and officially supports EFI mode booting for Windows.

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