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

Anyone who knows better please correct me. I'd be extremely grateful to learn something more about how Boot Camp really works. : )

HFSExplorer does not help anything. I installed it and it cannot even load any of my existing drives. Perhaps Microsoft has done something to prevent third party apps from accessing windows directory?

Testing so far has pointed the finger squarely at Microsoft. If Apple will give me the driver code, I can debug it further. 😉

On Win10-1511-1-English-x64.iso (Build 10586 - same on 1511-2 ISO), the Apple drivers work. I have tested on W10 Pro and Home. In all cases BC6 drivers were 6.0.6136 (for a 2012 13-in MBP). Diskpart and Disk Management are shown as well. W10 does not work when BC5.x drivers are used on the working ISO.

Win10-1607-English-x64.iso does not work with BC5 or BC6 drivers.

theodore_kh wrote:

HFSExplorer does not help anything. I installed it and it cannot even load any of my existing drives. Perhaps Microsoft has done something to prevent third party apps from accessing windows directory?

HFS Explorer works on all my tests. It has to be run as Administrator to have access to device/partitions where the file system exists. Here is a working screen shot. Notice the partition information at the top of the window. I have not tested the Extract function.

Since the drivers are Apple-provided and Apple-certified, I can ask them to investigate. Bug 27739034 has been filed.

I can confirm Extract function works. HFSExplorer is a clunky solution, but so far the only one I've found that works.

Thanks for checking. I need to test an upgrade from Build 10586 to the current build, with an in-place upgrade to be able to check what happens.

I have observed the same issue.

Since I make a WinClone copy prior to each critical Microsoft update, I could revert to W10 with HFS+ support.

Apart from this, I strongly recommend to restrict the Windows update behaviour - this prevents you from being updated overnight.

Best regards,

Wolfgang Hoepfner

I cannot quote the entire Apple response, but the Bug Report has been closed. Part of the response, which is correct for newer Macs, is

This driver is not compatible with core storage which is the default for Macs. The driver is no longer bundled with SW downloads or supported in Win10.

If you need this capability, use third-party software or wait for a CS driver (My guess is that it is unlikely that it will ever be written by Apple).

Amen brother. That's what I use. Download the "Show or hide updates troubleshooter" here:

https://support.microsoft.com/en-us/kb/3073930

What does this mean? Is Apple saying they don't expect Mac with Win 10 ver 1607 dual boot to see Mac partition from Windows side? If so, why it works for Win 10 ver 1511?

W10 1607 made changes, which has broken these two drivers. Since W10 is supported on 2012 or later Macs, Apple is deprecating the driver, because the corresponding versions of OS X (El Capitan and Sierra) default to CoreStorage, not JHFS+ file system.

Apple no longer will update/fix this driver for the latest release (1607) of W10 or later versions. One option I need to test is upgrading from 1511 to 1607 to see if W10 preserves the functionality for backwards compatibility, the way they have done for W7/W8.1 drivers.

I don’t get it about the core storage part, the Mac file system is still JHFS+, no change yet, the new file system APFS won't arrive until next year.

The JHFS+ driver for Windows 10 should not be deprecated yet.

Prof Z10 wrote:

I don’t get it about the core storage part, the Mac file system is still JHFS+, no change yet, the new file system APFS won't arrive until next year.

The JHFS+ driver for Windows 10 should not be deprecated yet.

CS is a Logical Volume Manager in use primarily in Yosemite, El Capitan and Sierra. It 'encapsulates' a JHFS+ volume inside a Logical Volume. Also see OSX and Bootcamp discussion and https://en.wikipedia.org/wiki/Core_Storage.

Please see the following verbs for help.

diskutil cs

Usage: diskutil [quiet] coreStorage|CS <verb> <options>,

where <verb> is as follows:

list (Show status of CoreStorage volumes)

info[rmation] (Get CoreStorage information by UUID or disk)

convert (Convert a volume into a CoreStorage volume)

revert (Revert a CoreStorage volume to its native type)

create (Create a new CoreStorage logical volume group)

delete (Delete a CoreStorage logical volume group)

createVolume (Create a new CoreStorage logical volume)

deleteVolume (Delete a volume from a logical volume group)

encryptVolume (Encrypt a CoreStorage logical volume)

decryptVolume (Decrypt a CoreStorage logical volume)

unlockVolume (Attach/mount a locked CoreStorage logical volume)

changeVolumePassphrase (Change a CoreStorage logical volume's passphrase)

diskutil coreStorage <verb> with no options will provide help on that verb