Bootcamp partition vanished on nMP

Discussion in 'Mac Pro' started by Anim, Jun 25, 2014.

  1. Anim macrumors 6502a

    Anim

    Joined:
    Dec 16, 2011
    Location:
    Macclesfield, UK
    #1
    Woes!

    Where has my Windows 8.1 partition gone! I was on a windows game last night, everything was running smoothly, no problems at all. Shutdown normally and went to bed.

    Started my Mac Pro this morning by just powering it on (defaults to booting into OSX for work) and it was stuck in some kind of reboot loop saying there was a problem starting up. I held down alt key and booted into recover partition and looked at disk utility, it said there was a EFI boot error.

    I tried a repair which said it couldn't repair it.

    I then rebooted again holding ALT and just the Macintosh + Recovery partitions showed up as options.

    I tried booting into OSX and it loaded fine this time, went into disk utility and the BOOTCAMP partition is there, I can view all the files on it too.

    Any ideas how to repair the boot sector so I can get both OSX and Windows as options again?

    (I am currently creating a disk image of bootcamp to an external)

    New Mac Pro, 512GB SSD, Bootcamp and OSX on internal SSD. Windows is 8.1. I tried Parallels Desktop and deleted it when the trial ended about 2 weeks ago, I have added a secondary monitor last night via HDMI and thats it for the last couple of weeks. No other software installs. I scan for viruses almost daily using malware bytes software. I don't visit dodgy websites.

    So, no idea how this occurred between this morning and last night. The only thing I did was disconnect everything the day before for an office rearrange.

    I have not resized any partition since buying the mac.

    Any help would be much appreciated.
     
  2. EvilMonk macrumors regular

    EvilMonk

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    Aug 28, 2006
    Location:
    Montreal, Canada
    #2
    Try to boot the recovery partition and open disk utility then select your SSD -> click on repair disk

    Edit : Sorry didnt read you did that part already

    Try to first backup the bootcamp partition from disk utility while you can still see it before taking any attempt at repairing it.
    Once its done do you have techtool pro 7?
     
  3. Anim thread starter macrumors 6502a

    Anim

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    Dec 16, 2011
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    Macclesfield, UK
    #3
    Hi

    I don't have tectool Pro, no. Is TestDisk any good? http://www.cgsecurity.org/wiki/TestDisk

    Thanks for helping.
     
  4. EvilMonk macrumors regular

    EvilMonk

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    #4
    I never heard about TestDisk, I'll install it and will be back right after... lucky you I'm on vacation :D
     
  5. Anim thread starter macrumors 6502a

    Anim

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    #5
    Dont mess up your own drive! I will be back later, have to go on an errand while this backup is running. Cheers
     
  6. EvilMonk macrumors regular

    EvilMonk

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    #6
    Even if I mess it up I have an xServe running as a TimeMachine server at home for all my Mac Clients and my rMBP is backed up on it 15 minutes ago!
    I just need to find out how that software is running and it will be my pleasure to help you with that!
     
  7. MacProCard macrumors 6502

    Joined:
    Jun 3, 2014
    #7
    Maybe an app did. I had this kind of problem until I encrypted both Operating systems.
     
  8. EvilMonk macrumors regular

    EvilMonk

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    #8
    First time I ever heard of that happening by mistake and I used to work on a project to encrypt the hard drives of 4500 laptops for the National Bank of Canada. Laptop don't just resize or delete partitions or volumes. Users doing it by mistake do. There is nothing magical that will make an app behave in such a matter, only users that might be working too much, striking a key by mistake, hit the mouse while it clicks or something like that...
     
  9. MacProCard macrumors 6502

    Joined:
    Jun 3, 2014
    #9
    I'm not so sure about that. While I never had the need to write an app to access the partition, I suspect you could. Just like I could write to the registry to store values.
     
  10. EvilMonk macrumors regular

    EvilMonk

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    #10
    Well on the Mac side any modifications to the system need to be authenticated with the users password ;)
    Which only leave windows... the enemy to shoot down... that OS is quite problematic but AFAIK on 4500 laptops encrypted for bankers, only .4% came back for partition problems.
     
  11. Anim thread starter macrumors 6502a

    Anim

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  12. ghislain macrumors member

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    Apr 22, 2009
    #12
    On a real PC, it is possible to repair the boot sector (google search to have a look). Unfortunatly, I don't think it is possible on a bootcamp partition since it is located on the EFI partition (200MB) or on the windows reserved partition created during Windows installation. So, I think you have to start again from scratch, i.e remove your bootcamp partition with bootcamp assistant (hoping it works), then create a new bootcamp partition on your disk and install again windows. For safety, you can later create an image of your bootcamp partition with Winclone or create both an image of your bootcamp partition and of the EFI partition with Acronis true image. Not very good news, but hope it will be of some help.
     
  13. EvilMonk macrumors regular

    EvilMonk

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    #13
    There isn't a lot of options I can see in that tool.
    You would be better to boot into recovery mode if you can. Boot on the Windows 8.1 install disk, I think you can repair the installation from there (Not format, there is a recovery option) when you start Windows installation.

    There is a good guide here http://windowssecrets.com/forums/sh...air-Windows-8-(8-1)-Without-Losing-Everything

    or if you can't even get in windows, boot off the install DVD and use this one!!! You have an option to keep all your files and reinstall Windows.
    http://www.softwareok.com/?seite=faq-Windows-8&faq=26

    Beside that, I don't see a lot of options... I would try this one maybe http://www.eightforums.com/tutorials/26095-repair-install-windows-8-a.html

    but a good option might be to download hirens boot CD which has a lot of tools for partition repair on it.
    Its free and it gives you a bootable from CD windows environment that is loaded in your RAM.
    http://www.hirensbootcd.org/download/

    Let me know how it goes!!
     
  14. MacProCard macrumors 6502

    Joined:
    Jun 3, 2014
    #14
    I wrote bill payment software for the US banks about 10yrs ago. Correct me if I'm wrong, but once a drive is encrypted, it can no longer be resized.

    With that in mind, you can recreate the OP's issue by encrypting the Win 8.1 first. Win 8.1 will resize the partition during the encryption process and the OS X partition will be gone. It's a bug in bootcamp if you ask me.
     
  15. EvilMonk macrumors regular

    EvilMonk

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    #15
    I said came back for partition problems, not partition resize... I am talking about laptops that were halted while a crucial part of the encryption was taking place or drives that didn't survive the stress of the encryption...
     
  16. Anim thread starter macrumors 6502a

    Anim

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    #16
    Thanks guys.

    Reinstalling windows is something I was hoping to avoid but if it's the solution then so be it. I will try to find out what happened in the first place too as I would rather this wasn't a recurring issue with my setup.

    Thanks
     
  17. EvilMonk macrumors regular

    EvilMonk

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    #17
    You might have some success with hirens boot cd, I've put the link in my previous post :)
     
  18. Anim thread starter macrumors 6502a

    Anim

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    #18
    I am about to go through your links now. Fingers crossed :)
     
  19. EvilMonk macrumors regular

    EvilMonk

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    #19
    Used it quite a lot of times, its a tweakers magical cd, I was able to repair partitions with it, remove viruses and spywares from computers that I believed to be lost for good. theres so many good tools on there.
     
  20. Anim thread starter macrumors 6502a

    Anim

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    Dec 16, 2011
    Location:
    Macclesfield, UK
    #20
    The first link wasn't applicable as can't load windows to begin that fix

    The second link showed different screens to my Win 8.1 install and different options too although there was an Advanced page where you can ask windows to look at issues stopping windows from booting, I ran this and after about 30 seconds it reported it couldn't fix the issue (and didn't make it worse).

    I had a look at Hirenboot cd website ( http://www.hiren.info/pages/bootcd ) but there was nothing to help fix EFI boot partitions mentioned in the above link.

    Looks like I'm going to have to go through Bootcamp, erase the old bootcamp partition, reinstall windows then try to restore the BOOTCAMP backup image I created earlier with disk utility. I will report how that goes.

    Thanks
    Anim
     
  21. EvilMonk macrumors regular

    EvilMonk

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    #21
    There are a lot of partioning tools on the hirens boot cd. And a lot of other tools as well
     
  22. Anim thread starter macrumors 6502a

    Anim

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    #22
  23. OsakaTom macrumors newbie

    Joined:
    Jun 29, 2009
    #23
    I had the exact same problem with my nMP and Win 8.1 Bootcamp partition. Nothing seemed to work, until I tried migrating the partition over to an external drive via WinClone (Crucial m500 SSD via Thunderbolt) and haven't had any issues since. Added bonus of freeing up all the space on the onboard SSD!
     
  24. austinpike macrumors 6502

    Joined:
    Oct 5, 2008
    Location:
    MN
    #24
    ^ this. I installed Windows on an external Thunderbolt partially to avoid such issues. Easier to fix when one OS goes down if you don't have to have to tiptoe around worrying about nuking the other OS in the process.
     
  25. hfg macrumors 68040

    hfg

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    Dec 1, 2006
    Location:
    Cedar Rapids, IA. USA
    #25
    Saving an occasional image of your Windows environment with WinClone is also a good backup in the event your Windows installation gets corrupted and you have to start over again. Installing Window is such a pain with all the countless updates and reboots .... restoring your WinClone image is quick and painless, and it is all done under OS X.
     

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