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Bootcamp and Yosemite upgrade - potential data loss warning

There are two specific cases that I am currently aware of which indicate potential data loss during Yosemite upgrade.


Please see


"Missing Operating system_ " After installing Yosemite

Windows 7 partition gone after installing Yosemite


This is the other side affect of Yosemite upgrade, which is lost functionality


windows 8 does not recognise Macintosh HD, No drive Letter


Please avoid an upgrade to Yosemite if you also have Bootcamp, till the data loss issue has been investigated and root cause established.

Posted on Oct 17, 2014 9:56 PM

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55 replies

Oct 18, 2014 1:29 PM in response to akirarsah

Bootcamp partition issue after Yosemite upgrade (missing 27GB) and Yosemite changed the MBR to two entries. 😢


Please capture the output of the following commands before the upgrade and after, and if there are any differences, Bootcamp will stop working.


diskutil list

diskutil cs list

sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0


Enter you password when prompted.

Oct 23, 2014 6:31 AM in response to Loner T

Hi guys, in another thread i posted something that worked for me regarding this: Windows 7 partition gone after installing Yosemite. Below i copied my post and included a screenshot.

Hey guys,


I noticed I had the same problems because I got some error messages pertaining to NTFS-3G I had installed in combination with OS X Fuse (which I did not have installed any more some how). I use NTFS-3G to read NTFS formatted disks in my Mac, and Fuse is needed to extend OS X’s native file handling capabilities via third-party file systems (literally copied that from them 🙂). After I installed Fuse I could see the Boot Camp disk logo on my Finder Desktop, was able to boot up Windows 7 through VMWare Fusion and through a normal Boot Camp restart (holding down the option key).


So for me this worked, maybe worth a shot for some of you. Good luck everyone!

User uploaded file

Bootcamp and Yosemite upgrade - potential data loss warning

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