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Q: "Missing Operating system_ " After installing Yosemite

Please help, after installing Yosemite now i can't get to my windows 7 anymore . At first i can't even get to see Windows partition when i hold ALT during boot but i got that fixed but now that i try to get to windows its just not happening . Please help

 

Screen Shot 2014-10-17 at 9.08.38 PM.png

 

 

 

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IMG_0001.jpg

MacBook Pro (Retina, Mid 2012), OS X Yosemite (10.10)

Posted on Oct 17, 2014 6:49 PM

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Q: "Missing Operating system_ " After installing Yosemite

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  • by Loner T,

    Loner T Loner T Jan 8, 2015 6:04 AM in response to abughareeb
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    Jan 8, 2015 6:04 AM in response to abughareeb

    This looks incorrect. Look at the entry #4 on your screen which has a start/end of 898650112/976773119 but what you found from Testdisk was 859590656/976773112. Something did not work correctly in the first set of steps, otherwise you should see the values from Testdisk in entry #4.

     

    Can you post the output of sudo gpt -vv -r show /dev/disk0 as it is now?

  • by abughareeb,

    abughareeb abughareeb Jan 8, 2015 2:39 PM in response to Loner T
    Level 1 (0 points)
    Jan 8, 2015 2:39 PM in response to Loner T

    THANKS Loner T,

     

    Yes, Yes , Yes , and Yes are the answers to your questions. I successfully recovered boot camp partition and all my windows files thanks to your help. I opted for the default values and it worked. I really appreciate your help thanks for being an amazing human being.

     

    Regards,

    Abughareeb

  • by abughareeb,

    abughareeb abughareeb Jan 8, 2015 2:45 PM in response to Loner T
    Level 1 (0 points)
    Jan 8, 2015 2:45 PM in response to Loner T

    Here it's =>

    Screen Shot 2015-01-08 at 5.42.20 PM.png

    As I mentioned above everything is back to normal again. Let me know if I need to make any modifications.

     

    Thanks

  • by Loner T,

    Loner T Loner T Jan 8, 2015 3:16 PM in response to abughareeb
    Level 7 (24,419 points)
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    Jan 8, 2015 3:16 PM in response to abughareeb

    Very nicely done. Thanks for the update. I suggest a backup of OSX and Windows as a baseline for future upgrades.

  • by abughareeb,

    abughareeb abughareeb Jan 8, 2015 4:08 PM in response to Loner T
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    Jan 8, 2015 4:08 PM in response to Loner T

    Will do thanks again Loner T.

  • by abughareeb,

    abughareeb abughareeb Jan 8, 2015 8:52 PM in response to Loner T
    Level 1 (0 points)
    Jan 8, 2015 8:52 PM in response to Loner T

    Sorry to bug you again Loner T, but I am unable to log back in to OSX. I can see both partitions on boot up. Windows works fine which I am writing to you from. However, I can'tt boot into mac os x. When I select Mac OSX I get to the grey screen  once the progress bar reaches the end a "no entry" sign comes up. I tried going to recovery mood to see what is going on. One thing I can see raised suspicion is the size of my HD which is 500.11 GB and that is it.

     

    Please help

  • by Loner T,

    Loner T Loner T Jan 8, 2015 10:24 PM in response to abughareeb
    Level 7 (24,419 points)
    Safari
    Jan 8, 2015 10:24 PM in response to abughareeb

    1. If you look at the mediasize value (500107862106 sectors), it is roughly 500.11 Gib as specified by the manufacturer.

    2. In Control Panel -> System -> Boot Camp, can you select OSX and bring up OSX?

    3. If you power-cycle your Mac and hold the Alt key, do you get OSX as a choice? If selected, what happens.

    4. In Recovery Console, can you take a photo of the gpt -vv -r show /dev/disk0 in Utilities -> Terminal to check if it matches the one you posted earlier.

    5. Do you see an image like this one ?

     

    Missing-OSX.JPG

  • by abughareeb,

    abughareeb abughareeb Jan 9, 2015 2:48 PM in response to Loner T
    Level 1 (0 points)
    Jan 9, 2015 2:48 PM in response to Loner T

    Hi Loner T,

     

    Here is what I found so far:

     

    1- OSX doesn't show up in  Control Panel -> System -> Boot Camp. I can only bring the partition up when I click alt during boot process which brings both partitions. I then chose Macintosh HD as my boot drive. It lets me do that after which a gray screen with a gray progress bar comes up until the end of that progress bar. After that a gray screen with a    right in the middle of the screen shows up.

     

     

    Here is the disk utility and the execution result of the cmd you asked for =>

     

    IMG_3573.JPG

     

     

     

     

     

     

    IMG_3571-800.jpg

     

    Please pardon the images resolution I took them with my cell phone and had to resize to get them under 2MB.

     

    Thanks for the help.

  • by Loner T,

    Loner T Loner T Jan 9, 2015 6:40 PM in response to abughareeb
    Level 7 (24,419 points)
    Safari
    Jan 9, 2015 6:40 PM in response to abughareeb

    If you notice the long string after GPT 2 is different between when OS X was working and what it is now. This happened because when Gdisk was used to create the Hybrid MBR, for GPT 2 the hex code used was 'AF' (JHFS+), but it should have been 'AF05' (CoreStorage).

     

    Do you have another Mac and TB/FW cable and connector?

  • by abughareeb,

    abughareeb abughareeb Jan 9, 2015 7:10 PM in response to Loner T
    Level 1 (0 points)
    Jan 9, 2015 7:10 PM in response to Loner T

    I do have an older mac but I don't have the connector. What is the scenario ?

  • by Loner T,

    Loner T Loner T Jan 10, 2015 4:27 AM in response to abughareeb
    Level 7 (24,419 points)
    Safari
    Jan 10, 2015 4:27 AM in response to abughareeb

    The method uses Target Disk Mode as described in Share files between two computers with target disk mode - Apple Support.

     

    The other option is to install OS X on an external disk, install GPT Fdisk and boot from it to fix this. Please see OS X: Installing OS X on an external volume - Apple Support.

  • by abughareeb,

    abughareeb abughareeb Jan 11, 2015 5:48 PM in response to Loner T
    Level 1 (0 points)
    Jan 11, 2015 5:48 PM in response to Loner T

    I will do the second option. I am going to follow the instruction to download and boot from the external drive. What should I do after that Loner?

     

    Please give me the steps that follows.

     

    Thanks

  • by Loner T,

    Loner T Loner T Jan 11, 2015 6:07 PM in response to abughareeb
    Level 7 (24,419 points)
    Safari
    Jan 11, 2015 6:07 PM in response to abughareeb

    Install GPT Fdisk on this external disk as well. Run Gdisk the way you did for deleting/adding GPT 4, but the difference is that the partition type will be changed from AF (JHFS+) to AF05 (CS) for GPT 2.

  • by abughareeb,

    abughareeb abughareeb Jan 12, 2015 2:25 AM in response to Loner T
    Level 1 (0 points)
    Jan 12, 2015 2:25 AM in response to Loner T

    What about the other ones ? Because it did ask me the types for all of the. After that I could answer for Y/N for bootable flag.

  • by Loner T,

    Loner T Loner T Jan 12, 2015 3:43 AM in response to abughareeb
    Level 7 (24,419 points)
    Safari
    Jan 12, 2015 3:43 AM in response to abughareeb

    You are not trying to create a new MBR, but if you look at the Gdisk menu, the following steps will let you change the partition type of a specific partition.

     

    sudo gdisk /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.

     

    Command (? for help): t

    Partition number (1-4): 2

    Current type is 'Apple Core Storage'

    Hex code or GUID (L to show codes, Enter = AF00): AF05

    Changed type of partition to 'Apple Core Storage'

     

    Command (? for help): p

    Disk /dev/disk0: 500118192 sectors, 238.5 GiB

    Logical sector size: 512 bytes

    Disk identifier (GUID): 22749ACF-207D-458E-B255-5DF02C39DC2D

    Partition table holds up to 128 entries

    First usable sector is 34, last usable sector is 500118158

    Partitions will be aligned on 8-sector boundaries

    Total free space is 1325 sectors (662.5 KiB)

     

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

       1              40          409639   200.0 MiB   EF00  EFI System Partition

       2          409640       250801735   119.4 GiB   AF05  OSY-MBP13

       3       250801736       252071271   619.9 MiB   AB00  Recovery HD

       4       252071936       500117503   118.3 GiB   0700  BOOTCAMP

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