AndyT0106

Q: Bootcamp Windows 7 disappeared after OS update last night...

After I updated to OS X Yosemite last night, my Windows 7 partition was gone.

I'm not able to see it when I press down OPTION during boot, but I do see a strange name "disk0s4" under disk utility.

Can anyone help me out here?

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MacBook Pro (Retina, Mid 2012), Windows 7

Posted on May 9, 2015 5:44 AM

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Q: Bootcamp Windows 7 disappeared after OS update last night...

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  • by AndyT0106,

    AndyT0106 AndyT0106 May 10, 2015 7:15 PM in response to Loner T
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    May 10, 2015 7:15 PM in response to Loner T

    Neveremind my last post, I finally got the second part of instructions right!

    Didn't need to type the "O".

    So I was able to see bootcamp in finder, able to see the files in there, able to see bootcamp in system preference.

    But when I select boot from windows, it's just stuck in the windows boot screen forever...

  • by Loner T,

    Loner T Loner T May 11, 2015 5:27 AM in response to AndyT0106
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    May 11, 2015 5:27 AM in response to AndyT0106

    You will need Windows Startup Repair. Please also see https://support.microsoft.com/en-us/kb/927392.

  • by AndyT0106,

    AndyT0106 AndyT0106 May 11, 2015 9:12 AM in response to Loner T
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    May 11, 2015 9:12 AM in response to Loner T

    I used it but windows couldn't recover.

    I ran command prompt as the website you wanted me to check out, but didn't work.

    Is it possible I ran something wrong at the Mac OS X end?

    Or did I just not get the windows command prompt part right?

    Please advise, thanks!

  • by Loner T,

    Loner T Loner T May 11, 2015 11:01 AM in response to AndyT0106
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    May 11, 2015 11:01 AM in response to AndyT0106

    Please post the output of

     

    sudo gpt -vv -r show /dev/disk0

    sudo fdisk /dev/disk0

  • by AndyT0106,

    AndyT0106 AndyT0106 May 11, 2015 4:10 PM in response to Loner T
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    May 11, 2015 4:10 PM in response to Loner T

    Here,

    Screen Shot 2015-05-11 at 8.09.37 PM.png

  • by Loner T,Solvedanswer

    Loner T Loner T May 11, 2015 4:23 PM in response to AndyT0106
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    May 11, 2015 4:23 PM in response to AndyT0106

    Your MBR is incorrect. You have entered 'n' where it should not be entered. Please see the second set of Gdisk steps, and the example below it. I will paste it here again. You need to repeat the second set of Gdisk commands again.

     

    Please post a screen shot when you do this.

     

    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.

    1. Sudo gdisk /dev/disk0
    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 4
    7. Y  (Good for GRUB question)
    8. N  (part 2 boot flag)
    9. N  (part 3 boot flag)
    10. Y  (part 4 boot flag make NTFS bootable partition)
    11. O  (print current Hybrid MBR)
    12. W (Write the new MBR)
    13. Y (Yes! write the new MBR)
    14. 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 AB): Press Enter/Return

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

     

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

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

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

  • by AndyT0106,

    AndyT0106 AndyT0106 May 11, 2015 4:28 PM in response to Loner T
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    May 11, 2015 4:28 PM in response to Loner T

    Is this correct?

    Screen Shot 2015-05-11 at 8.26.50 PM.pngScreen Shot 2015-05-11 at 8.27.23 PM.png

  • by Loner T,

    Loner T Loner T May 11, 2015 4:35 PM in response to AndyT0106
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    May 11, 2015 4:35 PM in response to AndyT0106

    This is incorrect. You are making the same mistake again.

     

    Did you see the following three entries in my example? Please repeat the steps again.

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

  • by AndyT0106,

    AndyT0106 AndyT0106 May 11, 2015 4:38 PM in response to Loner T
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    May 11, 2015 4:38 PM in response to Loner T

    Thanks so much, I finally got it!

    You are more knowledgeable than any apple support I have encountered haha.

    Thank you again!

  • by Loner T,

    Loner T Loner T May 11, 2015 4:39 PM in response to AndyT0106
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    May 11, 2015 4:39 PM in response to AndyT0106

    Is Windows now up and running?

  • by AndyT0106,

    AndyT0106 AndyT0106 May 11, 2015 4:41 PM in response to Loner T
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    May 11, 2015 4:41 PM in response to Loner T

    Yes it's up and running now, but I haven't restarted the computer yet.

    Hope nothing goes wrong after reboot haha.

  • by Loner T,

    Loner T Loner T May 11, 2015 4:42 PM in response to AndyT0106
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    May 11, 2015 4:42 PM in response to AndyT0106

    Please test switching between the OSes and make good backups of OSX an Windows as a base line.

  • by AndyT0106,

    AndyT0106 AndyT0106 May 12, 2015 2:17 PM in response to Loner T
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    May 12, 2015 2:17 PM in response to Loner T

    Yes after this incident I think I will make good back ups..

    One more thing, I'm not able to access the Mac drive anymore when I'm in bootcamp, I was able to do that before.

    Please take a look here:

    drives.png

    I'm not able to click on the D drive which the drive mac is installed on...

  • by Loner T,

    Loner T Loner T May 12, 2015 2:26 PM in response to AndyT0106
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    May 12, 2015 2:26 PM in response to AndyT0106

    The OSX volume is now a Core Storage volume as shown by the output of diskutil cs list. The output shows that it is revertible. Please execute the following command on the OSX side in Terminal.

     

    diskutil cs revert disk1

  • by AndyT0106,

    AndyT0106 AndyT0106 May 12, 2015 2:26 PM in response to Loner T
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    May 12, 2015 2:26 PM in response to Loner T

    After this will I still be able to use Windows 7 as usual?

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