Brian Kendig

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

Close

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

  • All replies
  • Helpful answers

Page 1 of 5 last Next
  • by djpenn,Helpful

    djpenn djpenn Aug 3, 2016 8:07 PM in response to Brian Kendig
    Level 1 (71 points)
    Windows Software
    Aug 3, 2016 8:07 PM in response to Brian Kendig

    I was holding off to see cheers or jeers... started googling tonight and found this Apple community and a Slashdot post which in particular is disconcerting:

    https://linux.slashdot.org/story/16/08/03/1614223/windows-10-anniversary-update- borks-dual-boot-partitions

     

    The report mentioned in SlashDot is here:

    http://windowsreport.com/partition-disappears-windows-10-anniversary-update/

    ... and it mentions a MiniTool Partition Wizard app. I'm looking at the site; looks free. I would try to download that in Windows and without committing to any modifications, driver changes, etc. does it "see" the HFS+ partition?

  • by Brian Kendig,

    Brian Kendig Brian Kendig Aug 3, 2016 8:06 PM in response to djpenn
    Level 2 (185 points)
    Windows Software
    Aug 3, 2016 8:06 PM in response to djpenn

    Thank you for the tip. I installed MiniTool Partition Wizard; it sees the partition type as "Other", and doesn't give me an option to mount it (the Mount menu item is greyed out).

     

    Since the partition works fine when I boot into Mac OS, I suspect that the Boot Camp driver isn't loading for some reason, and I think (hope!) that the Mac partition itself is fine. It's just Windows that doesn't recognize it.

  • by djpenn,

    djpenn djpenn Aug 3, 2016 9:08 PM in response to Brian Kendig
    Level 1 (71 points)
    Windows Software
    Aug 3, 2016 9:08 PM in response to Brian Kendig

    Hmm... If the HFS+ read-only Windows driver is not being loaded, and downloading the Boot Camp driver package does not reinstall it, I would try opening an elevated command prompt (Start menu > type cmd > press Ctrl+Shift+Enter for command prompt to Run as Admin) then enter

    sfc /scannow

    It should return "No integrity violations found". If it says "some corrupted files were found and repaired", reboot, do the same again, then it should say no integrity violations found.

     

    Do you have FileVault? Try disabling that... might be this old issue, but the driver locations are noted here:

    HFS+ Drive not visible on Windows 10 Bootcamp partition with support software

     

    If that does not do it, I would try Apple Software Update, and if it's not critical, wait a few days for 1) a Microsoft update for Windows 10 build 14393 or version 1607, and/or 2) an Apple update to the Boot Camp driver package -- again. Then install the whole thing again.

    * Apple literally can change the Boot Camp Win driver package weekly, if not more often, with no versioning changes, no notifications, etc. Remember... it's "unsupported"!! My AMD graphics card drivers is how I found that out...

    Two Boot Camp updates repeatedly offered in Apple Software Update (ASU)

     

    The main point being... don't "repair" BCD (boot config data) in Windows or anything else that might endanger the partition. If you approach it from the Windows viewpoint, you will most likely lose non-NTFS partitions if the GUID Partition Table (GPT) is altered. If you can boot into Mac OS, the partition is okay, it's just a Windows issue that hopefully Apple can issue a driver update for or Windows can issue a partition map fix for, since it does not seem limited to OS X (based on all the Linux partition issues people have posted)...

     

    Like someone said in reddit "This is Microsoft's punishment for seeing other operating systems on the side" lol

  • by Brian Kendig,

    Brian Kendig Brian Kendig Aug 3, 2016 10:07 PM in response to djpenn
    Level 2 (185 points)
    Windows Software
    Aug 3, 2016 10:07 PM in response to djpenn

    Good thoughts; thank you.

     

    "sfc /scannow" returns "Windows Resource Protection did not find any integrity violations." Also, I'm not using FileVault. Apple Software Update finds no new upgrades (on either the Windows or the Mac side).

     

    I'll be patient and wait for patches. Unnerving, though, for a filesystem to no longer be recognized as valid!

  • by awoodelf,

    awoodelf awoodelf Aug 4, 2016 2:07 AM in response to Brian Kendig
    Level 1 (4 points)
    Windows Software
    Aug 4, 2016 2:07 AM in response to Brian Kendig

    Same problem, earlier onset (I'm signed up to get release preview builds). Was really hoping MS was going to patch this before the wide release, but no such luck.

     

    The latest build of HFSExplorer (http://www.catacombae.org/) works a charm for mounting, mapping, and extracting data from the HFS partition, so long as it is "Run in Administrator Mode". But as a software tool, it is somewhat inelegant compared to native access though File Explorer. Here's hoping this feature can be restored before long.

  • by Loner T,Helpful

    Loner T Loner T Aug 4, 2016 7:37 AM in response to Brian Kendig
    Level 7 (23,613 points)
    Safari
    Aug 4, 2016 7:37 AM in response to Brian Kendig

    The W10 and W10 Anniversary Update breaks the JHFS+ driver loading in Windows. W7 and W8.1 do not have these issues. I have also checked that 6.0.6136 JHFS+ packages are signed, but they will not load. I need to look in Event Viewer to see what is causing issues.

     

    If you have a business-crtitical system, I suggest staying away from the bleeding edge Windows updates otherwise you will hemorrhage.

  • by Brian Kendig,

    Brian Kendig Brian Kendig Aug 4, 2016 7:36 AM in response to Loner T
    Level 2 (185 points)
    Windows Software
    Aug 4, 2016 7:36 AM in response to Loner T

    "The W10 and W10 Anniversary Update breaks the JHFS+ driver loading in Windows" - thank you, that sounds like it. Do you know of any other discussions about this problem (on the Microsoft forums, perhaps)? I haven't been able to find any other mention of this, but it sounds like you know what you're talking about.

     

    Interestingly enough, I also have a Hackintosh with separate Mac OS and Windows 10 drives, and Windows 10 Anniversary Edition has the Paragon HFS+ driver installed but is no longer mounting the Mac drive. I wonder if this is related? And I also wonder whether the other problems people are reporting, with partitions disappearing under Windows 10, could also be related?

  • by Loner T,

    Loner T Loner T Aug 4, 2016 8:32 AM in response to Brian Kendig
    Level 7 (23,613 points)
    Safari
    Aug 4, 2016 8:32 AM in response to Brian Kendig

    Paragon HFS+ should be checked for driver signatures. You may also want to check for events in Event Viewer.

     

    My original tests are W7-to-W10 and W8.1-to-W10 and then Apple Software Update. Both the AppleHFS.sys and AppleMNT.sys are at 6.x versions.

     

    I am going to try a clean install of W10 and check these again. I am staying away from the Anniversary Update. 

  • by Prof Z10,

    Prof Z10 Prof Z10 Aug 4, 2016 9:24 PM in response to Brian Kendig
    Level 1 (4 points)
    Aug 4, 2016 9:24 PM in response to Brian Kendig

    Are you bootcamp 6?  Make sure you have latest bootcamp.   Running Apple Software Update will not upgrade your bootcamp. 

  • by djpenn,

    djpenn djpenn Aug 4, 2016 10:34 PM in response to Prof Z10
    Level 1 (71 points)
    Windows Software
    Aug 4, 2016 10:34 PM in response to Prof Z10

    Apple can deploy drivers through Apple Software Update, as they did in April 2016 when the AMD FirePro GL D700 drivers were updated from 15.201 to 15.301, before they reverted back to 15.200:

    ASU.png

    ...but they almost certainly will not do that for file system drivers; i.e., a new package needs to be downloaded in Boot Camp Assistant in Mac OS (Applications > Utilities). The Apple HFS and Apple Mount Manager drivers are still v.6.0.1.0 and 6.0.0.0, respectively, as of today which is the same as on 23 July 2016 and both drivers still have digital sigs from 12 August 2015. The BootCamp.msi is also still v.6.0.6136 on both dates and has the same hash. Will re-post if and when that changes... hopefully I'll hear of an MS patch at work before Apple has to do anything.

  • by Loner T,

    Loner T Loner T Aug 5, 2016 7:01 AM in response to Brian Kendig
    Level 7 (23,613 points)
    Safari
    Aug 5, 2016 7:01 AM in response to Brian Kendig

    I have clean installed W10 using the latest Win10_1607_English_x64.iso. There are no functional HFS drivers. I will run

    Win10_1511_English_x64.iso (both the _1 and _2 versions) and test. Next test is replacing these two files from a 5.1.5621 (for my specific model - 2012 13-in MBP) distribution and testing. I also have an older BC package 6.0.6133 to be tested.

     

    This is a W10 problem based on testing so far. Diskpart reports the partition but no volume is created/reported. The BIOS installations have the correct MBR. Either volume discovery is broken or the drivers do not support the latest builds.

  • by Brian Kendig,

    Brian Kendig Brian Kendig Aug 5, 2016 1:36 PM in response to Loner T
    Level 2 (185 points)
    Windows Software
    Aug 5, 2016 1:36 PM in response to Loner T

    Thank you - that's a lot to have been able to figure out, but I'm concerned that the people involved in fixing the bug and releasing an update might not have found what you did. Do you know of any way to report this to Apple (and possibly Microsoft)?

  • by awoodelf,

    awoodelf awoodelf Aug 5, 2016 1:45 PM in response to Brian Kendig
    Level 1 (4 points)
    Windows Software
    Aug 5, 2016 1:45 PM in response to Brian Kendig

    Have you tried HFSExplorer http://www.catacombae.org/ as a temporary means of gaining access?

  • by Loner T,

    Loner T Loner T Aug 5, 2016 1:53 PM in response to Brian Kendig
    Level 7 (23,613 points)
    Safari
    Aug 5, 2016 1:53 PM in response to Brian Kendig

    Brian Kendig wrote:

     

    Do you know of any way to report this to Apple (and possibly Microsoft)?

    I will file a bug report with Apple with a reproducible set of tests.

Page 1 of 5 last Next