Windows 7 partition gone after installing Yosemite

Hello Loner T,

I have the same issue and started a discussion as you asked.

Can you help me please, I want to access my old Windows files.

Thank you very much.

Discussion: Windows partition gone after Yosemite installation

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.

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

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.

following

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.

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

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.

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.

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.

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

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.

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?