Bootcamp windows 10, can't read Mac's partition (modified settings before)

Question

Level 1

4 points

Bootcamp windows 10, can't read Mac's partition (modified settings before)

Hi, I have been changing the setting of my macbook pro recently. Currently I would like to do a dual boot (Windows 10 <---> OSX). I have tried to use linux as well previously and changed the settings a bit ( on the post Boot Camp Windows 7 "Missing Operating System" ).

Here is the current situation:

* Both of my OSX, Windows 10 works fairly well

* But in Windows 10 , I couldn't access/ read my MAC partition (likely because for what I did back in Boot Camp Windows 7 "Missing Operating System" )

I did all the commands to check my partitions status again, they look quite weird.

- diskutil list

* not sure why there is a disk1 (internal, virtual) part that looks exactly the same as my disk0s2

- sudo gpt -r -vv show disk0

- sudo fdisk /dev/disk0

*** 2,3,4 all blanked here

- sudo gdisk /dev/disk0

* MBR is marked as protective here

Not sure why but both OS actually work very well, except I couldn't read the MAC partition from windows. Actually I did try to manually mount the MAC partition in windows, but there is formatting issue and asked me to re-format the MAC partition (which I obviously didn't do it).

*I wouldn't mind to make any adjustments, including to reinstall the windows 10 to get the set up right again.

I believe I just need to do the flagging all over again in gdisk and it would be fine.

* thanks for last time, Loner T. Unfortunately I find the experience of dual boot way better than including ubuntu after a while.

Sean

MacBook Pro with Retina display, iOS 10.2.1

Posted on Feb 18, 2017 5:37 PM

Reply

Answer 1

Loner T

Level 9

59,536 points

Feb 18, 2017 7:05 PM in response to D Sean

The first link you have posted is closer to your situation. The solution on your link is the same as what is posted on Windows 10 Anniversary + Boot Camp = no longer mounting Mac partition by the same user about assigning a drive letter. In your case, it will not work, because you have CoreStorage, not a HFS+ volume. You can revert back to JHFS+ using diskutil cs revert command, but be aware the BC6.1 no longer provides the Apple HFS drivers for Windows. The error message is correct, because the CS volume cannot be recognized a HFS+ driver.

The second link does not apply in your case, because you have the standard GPT. You do not have an MBR, and you may not need one, based on the Mac's year/model.

Reply

Answer 2

D Sean Author

Level 1

4 points

Feb 18, 2017 6:48 PM in response to D Sean

More informations (somehow the edit button isn't working) :

I removed rEFInd and did csrutil enable, now choosing OS by "Startup Disk" and it works. Mac can access windows partition.

The manual mounting on windows 10 is done as follow:

Mentioned from : http://apple.stackexchange.com/questions/251656/how-can-i-make-mac-partition-vis ible-in-bootcamp-windows-10-anniversary-update

Didn't work for me though (I am 99% sure I set the correct value, I tried them all).

I believe this question, and solution is most related to mine:

http://apple.stackexchange.com/questions/237062/hfs-partition-of-mac-osx-is-not- recognized-in-windows-10-bootcamp

Reply

Answer 3

D Sean Author

Level 1

4 points

Feb 18, 2017 7:28 PM in response to Loner T

Thanks a lot for replying that quickly.

Before following the instructions, here are my versions:

Bootcamp 6.0

Windows 10 version: 1607

About core stage, I have never heard of it (using it by default?). About HFS+, I checked and at "Windows\system32\drivers\" I do have both AppleHFS.sys and AppleMNT.sys (I supposed that means it is installed).

By reading your comments does that mean I just run the command "diskutil cs revert" in OSX?

PS. My macbook pro is retina late 2013

Reply

Answer 4

D Sean Author

Level 1

4 points

Feb 18, 2017 9:26 PM in response to Loner T

I wouldn't mind losing the encryption function, fact is I am not planning to use it anyway.

I have just tried the command "diskutil cs revert" in OSX.

Not so sure what to expect from it. I will check/ try again in windows 10.

Reply

Answer 5

D Sean Author

Level 1

4 points

Feb 18, 2017 9:52 PM in response to D Sean

OK, problem solved, thanks a lot Loner T, again.

For later reference, I followed the instructions in https://support.symantec.com/en_US/article.HOWTO109622.html to do the revert.

Here are my screen shots.

Revert it:

After restart, the command would return nothing.

Reply

Answer 6

D Sean Author

Level 1

4 points

Feb 18, 2017 10:05 PM in response to Loner T

Last list of pictures,

* adding the "D:", "REG_SZ", "\Device\HarddiskVolume2" is still necessary here to make the partition appears.

Indeed I can read the files from the MAC partition.

Thank you very much.

Reply

Answer 7

Loner T

Level 9

59,536 points

Feb 18, 2017 8:37 PM in response to D Sean

You can use the CS Revert command but, it adds an additional restriction. You cannot use Apple's disk encryption technology called FileVault2, because it requires CoreStorage. You have to decide.

You may be better off, if you choose an external shared disk between the two OSes, which would allow a corresponding backup strategy to be place for this drive.

Reply

Answer 8

Loner T

Level 9

59,536 points

Feb 19, 2017 5:43 AM in response to D Sean

Excellent. Please back up OS X, Windows and create a Windows System Restore point for future recovery.

Reply