Brian Kendig
Level 2 (185 points)
Windows Software

Q: Windows 10 Anniversary + Boot Camp = no longer mounting Mac partition

I have a Retina MacBook Pro (Late 2013) with Mac OS El Capitan, dual-booting with Windows 10 with Boot Camp installed. Everything was working fine until I installed the Windows 10 Anniversary Update today; now Windows no longer mounts the Mac partition. I successfully reinstalled the latest Boot Camp drivers, but Windows still won't show me the Mac partition. (Booting into Mac OS works fine.)

 

Is anyone else seeing this problem? Anyone know of a solution or workaround?

Posted on Aug 3, 2016 6:12 PM

by djpenn,Apple recommended
djpenn djpenn
Level 1 (71 points)
Windows Software
A:

This is from http://news.softpedia.com/news/windows-10-anniversary-update-might-hide-partitio ns-after-install-507247.shtml:

One of the issues experienced by users after installing the Windows 10 Anniversary Update concerns partitions, as many of those who upgraded their computers reported that a number of partitions disappeared from File Explorer.

Furthermore, all partitions show up as RAW in Disk Management, which makes most people believe that all their data has been removed and nothing can be recovered.

Microsoft, however, claims that this is just a bug discovered in the Windows 10 Anniversary Update install system, and while no files are lost, it’s critical for users not to try to recover anything with third-party apps because this could lead to completely breaking down the partitions and removal of data.

“Microsoft is aware of this issue and is working on a solution to be released through Windows Update. Any data you have stored on the affected partition is still there. We recommend that you not try to recover or otherwise write data to the affected partition, nor should you format the partition,” the company says.

You can also downgrade in the meantime

Microsoft’s Sharath Srinivasa goes on to explain that a patch will be released to users when it’s available and states that users who do not want to wait for it can always downgrade to their previous Windows version. Partitions should be then just as you created them, with all files once again accessible.

Rolling back to build 1511 works and hopefully not too many people will have hosed their BootCamp partition in the meantime.

Posted on Aug 14, 2016 11:52 AM

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Q: Windows 10 Anniversary + Boot Camp = no longer mounting Mac partition

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  • by calbear88,

    calbear88 calbear88 Sep 7, 2016 11:19 PM in response to Loner T
    Level 1 (4 points)
    Sep 7, 2016 11:19 PM in response to Loner T

    I have a 12 inch Retina Macbook that has Windows 10 build 1511 on it, and I can't see my mac partitions.  I think this is because the SSD on the macbook was configured with core storage, which the bootcamp NTSF drivers don't support

     

    I have a 5K iMac that doesn't have core storage, and I can see my Mac partitions just fine in bootcamp. 

    To check if your drive is partitioned under core storage go to Terminal and type "diskutil cs list".  If it says "No CoreStorage logical volume groups found", then you don't have core storage.

     

    Just wondering, is apple not enabling CoreStorage on all their new macs?  Are all the iMac 5K configured with core storage off, but Retina Macbooks come with it on for some reason?

  • by Loner T,

    Loner T Loner T Sep 8, 2016 2:36 AM in response to calbear88
    Level 7 (23,623 points)
    Safari
    Sep 8, 2016 2:36 AM in response to calbear88

    CS is the default beginning with Yosemite. It is mandatory if you use FileVault2 or have a Fusion drive. If you do not use FV2, and your CS is revertible, you can revert to HFS+ which will be visible and read-only on the Windows side.

  • by djpenn,

    djpenn djpenn Sep 14, 2016 6:19 AM in response to Loner T
    Level 1 (71 points)
    Windows Software
    Sep 14, 2016 6:19 AM in response to Loner T

    September 13, 2016 update:

    KB3189866 is out, bringing Windows 10 up to build 14393.187

     

    https://support.microsoft.com/en-us/kb/3189866

     

    The Knowledge Base article states "Windows 10 updates are cumulative. Therefore, this package contains all previously released fixes." but it looks just as crappy as the previous updates, at least as far as this partition issue is concerned...

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