Jesper-A

Q: Windows 7 partition gone after installing Yosemite

Hi!

 

I recently installed Yosemite (OS X 10.10) and now when I was going to boot my Windows 7 partition (by holding down 'alt' when booting) I realized that it's gone.

 

When I checked Disk Utility this is what I found:

Screenshot 2014-10-17 19.52.04.png

The Boot Camp partition is not there. But there's a new partition (Have not seen it before) called disk0s4 and it needs to be repaired. I assume this is my no longer working Boot Camp partition (?)

 


Should I just choose the recovery option when booting and use an back up from yesterday for the disk called 1TB HD? Or what should I do to get the Windows 7/Boot Camp partition back?

 

I'm using a late 2009 iMac 27"

iMac, Mac OS X (10.0.x), Late 2009

Posted on Oct 17, 2014 11:00 AM

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Q: Windows 7 partition gone after installing Yosemite

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  • by WeeeRob2,

    WeeeRob2 WeeeRob2 Oct 17, 2014 1:39 PM in response to Jesper-A
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    Oct 17, 2014 1:39 PM in response to Jesper-A

    I have the same issue on a Mid-2010 MacBook. I have a backup but still pretty f***ing annoying. I hope I can resolve without re-installing.

  • by shadowlow,

    shadowlow shadowlow Oct 17, 2014 5:12 PM in response to Jesper-A
    Level 1 (10 points)
    Oct 17, 2014 5:12 PM in response to Jesper-A

    Same issue, please post fix if found school work is all in my bootcamp partition. Ill reply back if i find anything

  • by Loner T,

    Loner T Loner T Oct 17, 2014 6:01 PM in response to Jesper-A
    Level 7 (23,813 points)
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    Oct 17, 2014 6:01 PM in response to Jesper-A

    Please post the output of

     

    diskutil list

    diskutil cs list

    sudo gpt -vv -r show /dev/disk0

    sudo fdisk /dev/disk0

     

    Your MBR seems to have been corrupted.

     

    Unless you explicitly backup Windows, Time Machine backups will exclude Bootcamp because it is an NTFS partition.

  • by LokoMix,

    LokoMix LokoMix Oct 17, 2014 6:14 PM in response to Jesper-A
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    Oct 17, 2014 6:14 PM in response to Jesper-A

    following

  • by Loner T,

    Loner T Loner T Oct 17, 2014 6:49 PM in response to LokoMix
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    Oct 17, 2014 6:49 PM in response to LokoMix

    If you see a partition like disk0s4, and your Bootcamp has disappeared, it means the MBR that was used for Windows has been corrupted by the OS X installer.  It may also have corrupted NTFS, but that can be checked in each individual case.

  • by Jesper-A,

    Jesper-A Jesper-A Oct 17, 2014 9:35 PM in response to Loner T
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    Oct 17, 2014 9:35 PM in response to Loner T

    This is what I got:

     

    Screenshot 2014-10-18 06.33.56.png

  • by Loner T,

    Loner T Loner T Oct 17, 2014 9:49 PM in response to Jesper-A
    Level 7 (23,813 points)
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    Oct 17, 2014 9:49 PM in response to Jesper-A

    I cannot see the image here, but I can see it on my phone.

     

    If your 1TB drive is 999GB and you have 890Gb OS X and 75GB Windows which is roughly 965Gb, you have lost ~34+ GB of disk space, possibly including data, which I think would be catastrophic for hundreds of customers, who may never discover till they actually go looking of riot, depending on where the corruption is. If Windows breaks, the specific use will know immediately, but others may end with a working installation and not realize before it is too late. Look at the gap between GPT #3 and GPT#4 in your output. You can validate my calculation, if you like.

     

    Please see an issue similar to yours - "Missing Operating system_ " After installing Yosemite

  • by Jesper-A,

    Jesper-A Jesper-A Oct 17, 2014 10:14 PM in response to Loner T
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    Oct 17, 2014 10:14 PM in response to Loner T

    Yes, I noticed the missing disk space too.

     

    Luckily for me, I didn't have anything super important on my Windows partition. But as you say, this could be catastrophic for some. especially for those who need to use Windows at work etc.

     

    Since I just backed up using Time Machine (and therefore don't have an Windows backup) and as mentioned above, I don't have anything super important. Would it be easier for me to just redo the whole Boot Camp process?


    Doing something like this:

     

    1. Reformatting the disk0s4 back to its original format
    2. Putting it back with the 1TD HD partition
    3. Verify the disk, and do an repair if necessary
    4. Make an new partition
    5. Reinstall Windows using Boot Camp

     

    What do you think?

  • by olypdd,

    olypdd olypdd Oct 18, 2014 2:34 AM in response to Jesper-A
    Level 1 (15 points)
    Oct 18, 2014 2:34 AM in response to Jesper-A

    Well I upgraded my iMac which is auto backed up nightly with Super Duper. Looks good. But I will not upgrade my Macbook Pros since I have Windows 7 partitions on them and use them for work. I downloaded the upgrade installer on my 15" last night but then remembered about the bootcamp/windows partition possibly being obliterated and went online to investigate. Unless they come up with a sure fire fix for this I won't upgrade the laptops. Don't feel like starting from scratch. Or...if it ain't broke, don't fix it.

  • by Loner T,

    Loner T Loner T Oct 18, 2014 8:41 AM in response to Jesper-A
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    Oct 18, 2014 8:41 AM in response to Jesper-A

    If you are willing to "nuke-and-pave", it should be very clean. Please ensure you have a backup of OS X before you start.

  • by Loner T,

    Loner T Loner T Oct 18, 2014 8:42 AM in response to olypdd
    Level 7 (23,813 points)
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    Oct 18, 2014 8:42 AM in response to olypdd

    olypdd wrote:

     

    Don't feel like starting from scratch. Or...if it ain't broke, don't fix it.

    I quite agree. I am planning to wait till 10.10.3+ before I venture further.

  • by olypdd,

    olypdd olypdd Oct 18, 2014 2:57 PM in response to Loner T
    Level 1 (15 points)
    Oct 18, 2014 2:57 PM in response to Loner T

    Can't hurt to wait either. That's my plan as well.

  • by UTC7,

    UTC7 UTC7 Oct 21, 2014 10:01 PM in response to Jesper-A
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    Oct 21, 2014 10:01 PM in response to Jesper-A

    I am having the same exact problem.  Had Windows 8.1 installed, now gone and replaced by this disk04 partition.

     

    The only reason why I bought an Apple computer it's because they start supported Windows with Intel processor with Bootcamp.  Nobody develop for MacOS, so I need for work to have Windows.  It's either a Macbook with Windows or no $ to Apple and another brand where Windows work on.  I have important files on this partition, plus I bought the Windows 8.1 and can't find the box with the key product, so it means that I will have to repay if I want to reinstall.  I had the same exact issue with 10.9.  So before, I did a timemachine backup, but it does not recover the windows partition.  What is this??? Apple is great at hardware, but software-wise and updates I am sorry, I can't give the passing mark, it's disappointing.

     

    Here's my system :

    Macbook Pro Retina Mid 2012

    Was on 10.9 with Bootcamp installed with Windows 8.1, updated to 10.10 and it screw up Windows for no reasons

     

    Hope someone finds a solution to this.

  • by 1Uno,

    1Uno 1Uno Oct 21, 2014 10:10 PM in response to Loner T
    Level 1 (0 points)
    Oct 21, 2014 10:10 PM in response to Loner T

    Hi Loner T

     

    Im having the same issue as Jesper-A

    I can see the disk0s4 partition, but Bootcamp has disappeared.

     

    What can I do to get the Bootcamp partition back?

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