Windows 10 not seing OS X Partition

[Laai]

Hello.

Sorry if this has been posted somewhere else, but on my late 2015 iMac (256GB SSD) I installed Windows 10 and installed bootcamp drivers. On my old machine I knew than, once bootcamp is installed under windows, I am able to see and read files from Mac partition when booted into windows. This no longer seems to be the case. I can see Win partition from OS X and read files from it, but not the other way around. Any advice?

 

[Shirasaki]

Third party drivers?
Don't know the latest changes, because I always use third party software to get r/w ability.

 

[Crazy Badger]

Are you using FileVault on your OSX partition? If you are, you won't see it through Bootcamp.

I always thought you needed something like MacDrive to see OSX partitions through a Bootcamp partition, unless you were virtualising it in OSX (using VMware or similar)

 

[Laai]

Third party drivers?
Don't know the latest changes, because I always use third party software to get r/w ability.

I'd like to see if I can get this native functionality, as I've had bad experience with third party drivers in the past. If I do have to use some however, do you have any recommendations?

Are you using FileVault on your OSX partition? If you are, you won't see it through Bootcamp.

I always thought you needed something like MacDrive to see OSX partitions through a Bootcamp partition, unless you were virtualising it in OSX (using VMware or similar)

Filevault is off. MacDrive is something along the lines of @Shirasaki 's post?

 

[Shirasaki]

I'd like to see if I can get this native functionality, as I've had bad experience with third party drivers in the past. If I do have to use some however, do you have any recommendations?



Filevault is off. MacDrive is something along the lines of @Shirasaki 's post?

I use paragon HFS and it runs very happily on my machine, with SIP enabled.
MacDrive is also a third party driver to allow Windows user read and write Mac format partition, like HFS+. Unlike paragon one, MacDrive provides more functions than paragon, including error fix, format to HFS function, etc.
However I have seen users reporting paragon software may damage user data, although I didn't notice this before. I don't see such reports on MacDrive, though. But, MacDrive is much more expensive than paragon one.

 

[ghislain]

Hello.

Sorry if this has been posted somewhere else, but on my late 2015 iMac (256GB SSD) I installed Windows 10 and installed bootcamp drivers. On my old machine I knew than, once bootcamp is installed under windows, I am able to see and read files from Mac partition when booted into windows. This no longer seems to be the case. I can see Win partition from OS X and read files from it, but not the other way around. Any advice?

In windows, open drive management located in Administration tools. You should see your drives and partitions. If your macos partition is not labeled as such (that I suspect to be the case), right click on this unlabeled partition and choose "add a letter". Accept the letter that is proposed and ,when it is done, you should now see your macos partition under windows...

 

[chrfr]

Hello.

Sorry if this has been posted somewhere else, but on my late 2015 iMac (256GB SSD) I installed Windows 10 and installed bootcamp drivers. On my old machine I knew than, once bootcamp is installed under windows, I am able to see and read files from Mac partition when booted into windows. This no longer seems to be the case. I can see Win partition from OS X and read files from it, but not the other way around. Any advice?

The problem is that Apple has moved to a formatting model called CoreStorage. Bootcamp doesn't include a driver that allows access to Mac volumes on CoreStorage drives but apparently Macdrive does work. Paragon HFS+ does not. Macdrive offers a free 5 day trial.

 

[Shirasaki]

The problem is that Apple has moved to a formatting model called CoreStorage. Bootcamp doesn't include a driver that allows access to Mac volumes on CoreStorage drives but apparently Macdrive does work. Paragon HFS+ does not. Macdrive offers a free 5 day trial.

I can see it under Windows, with BootCamp 6 and its driver installed. But yeah, if FileVault is on, then Windows cannot see that Mac partition.
And paragon HFS+ can see Mac partition files if FileVault is off.

 

[chrfr]

I can see it under Windows, with BootCamp 6 and its driver installed. But yeah, if FileVault is on, then Windows cannot see that Mac partition.
And paragon HFS+ can see Mac partition files if FileVault is off.

Paragon's own product pages state that they don't support CoreStorage volumes; a CoreStorage volume isn't created on every computer, but is created on some by default. Consequently, there are some cases where Apple's HFS driver and Paragon HFS+ will work, and other cases where they won't.
The OP's 2015 iMac is a computer that by default has a CoreStorage volume whether or not it's using FileVault.

 

[Shirasaki]

Paragon's own product pages state that they don't support CoreStorage volumes; a CoreStorage volume isn't created on every computer, but is created on some by default. Consequently, there are some cases where Apple's HFS driver and Paragon HFS+ will work, and other cases where they won't.
The OP's 2015 iMac is a computer that by default has a CoreStorage volume whether or not it's using FileVault.

Oh.
Yeah. Some drives like fusion drives, are formatted as CoreStorage by default.
My MacBook Air however, is not formatted as CoreStorage.

 

[chrfr]

Oh.
Yeah. Some drives like fusion drives, are formatted as CoreStorage by default.
My MacBook Air however, is not formatted as CoreStorage.

That's surprising- the Macbook Air, at least 2011 and newer, are ones where the drive will be formatted as CoreStorage by default. This 2012 on which I'm writing has a CoreStorage formatted disk, but not a FileVault or Fusion Drive.

 

[Shirasaki]

That's surprising- the Macbook Air, at least 2011 and newer, are ones where the drive will be formatted as CoreStorage by default. This 2012 on which I'm writing has a CoreStorage formatted disk, but not a FileVault or Fusion Drive.

I asked support from paragon, wondering if it was possible to display FileVault enabled Mac drive, when they explain this, they use "CoreStorage". So I thought CoreStorage was related to FileVault.

 

[chrfr]

I asked support from paragon, wondering if it was possible to display FileVault enabled Mac drive, when they explain this, they use "CoreStorage". So I thought CoreStorage was related to FileVault.

CoreStorage is the required underlying structure for FileVault, Fusion Drives, and Bootcamp support in drives that are larger than 2.2TB. So it is related, but it's also possible to put a standard HFS+, non-encrypted volume on a CoreStorage disk.

 

[Shirasaki]

CoreStorage is the required underlying structure for FileVault, Fusion Drives, and Bootcamp support in drives that are larger than 2.2TB. So it is related, but it's also possible to put a standard HFS+, non-encrypted volume on a CoreStorage disk.

Don't know what is the underlying structure of paragon drivers. But as I understand, CoreStorage may be related to extended partition or so? Like the extended partition under MBR. Some posts saying how to revert CoreStorage back to something mention something like GUID.
And there are other posts saying Apple provides preliminary EFI support.

 

[Laai]

So is there any way to disable CoreStorage? Like said, I only have 256GB SSD and thats it (I do not use FileVault).

 

[Shirasaki]

So is there any way to disable CoreStorage? Like said, I only have 256GB SSD and thats it (I do not use FileVault).

In my case, if you do a full backup of your machine, time machine, and format the whole disk, then partition, then port backup back, you may be good to go.
There should be some commands to help you out without doing such. I don't remember the detailed info however.

 

[Laai]

In windows, open drive management located in Administration tools. You should see your drives and partitions. If your macos partition is not labeled as such (that I suspect to be the case), right click on this unlabeled partition and choose "add a letter". Accept the letter that is proposed and ,when it is done, you should now see your macos partition under windows...

I can't find "Drive management" but I found "Disk Management" in "Computer Management". Is this what you mean? Here, I can see my OS X partition, without a name or a letter, but I don't know where I can add a letter to the partition... Rightclick only offers to delete it...

 

[Shirasaki]

I can't find "Drive management" but I found "Disk Management" in "Computer Management". Is this what you mean? Here, I can see my OS X partition, without a name or a letter, but I don't know where I can add a letter to the partition... Rightclick only offers to delete it...

Yeah, you are in the right place. But this is a little bit weird.

Probably, you need to reinstall the whole BootCamp thing under your Mac to see if you can get any option, including assigning drive letter.

 

[doynton]

So is there any way to disable CoreStorage? Like said, I only have 256GB SSD and thats it (I do not use FileVault).

Yes you can revert core storage back to HFS+ very quickly and easily from terminal in OSX. It was introduced as a default in Yosemite even if you don't use Filevault. If you do change it back your HFS drivers (Apple, paragon etc) will work as normal.

See here https://awesometoast.com/yosemite-core-storage-and-partition-woes/

 

[ghislain]

I can't find "Drive management" but I found "Disk Management" in "Computer Management". Is this what you mean? Here, I can see my OS X partition, without a name or a letter, but I don't know where I can add a letter to the partition... Rightclick only offers to delete it...

OK, it is disk management (sorry, I am french). If right click only offer you to delete the partition and all other options such as "modify the letter" are not available, I don't see what else is wrong. Sorry...

 

[chrfr]

I can't find "Drive management" but I found "Disk Management" in "Computer Management". Is this what you mean? Here, I can see my OS X partition, without a name or a letter, but I don't know where I can add a letter to the partition... Rightclick only offers to delete it...

If you do anything with partitions inside of Windows, you will almost certainly cause the loss of Mac data, so don't do anything there.
Macdrive is not inexpensive but should allow access to your Mac files from Windows without changing anything in OS X. If nothing else, you can install the free trial to see if it will work for you.
http://www.mediafour.com/software/macdrive/

 

[Shirasaki]

If you do anything with partitions inside of Windows, you will almost certainly cause the loss of Mac data, so don't do anything there.
Macdrive is not inexpensive but should allow access to your Mac files from Windows without changing anything in OS X. If nothing else, you can install the free trial to see if it will work for you.
http://www.mediafour.com/software/macdrive/

If we change partition table structure, we will lose the ability to boot to Mac OS X. Instead, we will only be able to boot to Windows. I have done this once and this is the only consequence I can see.
If you can manage to access that Mac partition, it is still possible to recover data from that partition.

 

[Fancuku]

I can see it under Windows, with BootCamp 6 and its driver installed.

Same here. I installed W8.1 with Bootcamp in my mid 2014 mbp and I can see the Mac partition from Windows. I didn't install any third party apps. Just the Bootcamp 6 drivers.

 

[Laai]

If you do anything with partitions inside of Windows, you will almost certainly cause the loss of Mac data, so don't do anything there.
Macdrive is not inexpensive but should allow access to your Mac files from Windows without changing anything in OS X. If nothing else, you can install the free trial to see if it will work for you.
http://www.mediafour.com/software/macdrive/

If we change partition table structure, we will lose the ability to boot to Mac OS X. Instead, we will only be able to boot to Windows. I have done this once and this is the only consequence I can see.
If you can manage to access that Mac partition, it is still possible to recover data from that partition.

Well, too late. I already did try to do something in windows and ended being unable to boot to OS X. I reinstalled both windows and os x
But hey, TimeMachine is a blessing, so everything went back to like 2h before the **** went down. Windows took about 10 minutes to install (yay new fast SSD) and now I can see the OS X partition under windows, so everything is fine (albeit the complete reinstall).

It did do 1 good thing however: the new bootcamp "forgot" to delete the 8GB partition after installing windows the first time, so I was left with 8GB of empty space on a partition I could not use nor format. Now, after the complete reinstall of both OS system, everything is fine. That terminal CoreStorage command helped tho ^^

 

[Shirasaki]

Well, too late. I already did try to do something in windows and ended being unable to boot to OS X. I reinstalled both windows and os x
But hey, TimeMachine is a blessing, so everything went back to like 2h before the **** went down. Windows took about 10 minutes to install (yay new fast SSD) and now I can see the OS X partition under windows, so everything is fine (albeit the complete reinstall).

It did do 1 good thing however: the new bootcamp "forgot" to delete the 8GB partition after installing windows the first time, so I was left with 8GB of empty space on a partition I could not use nor format. Now, after the complete reinstall of both OS system, everything is fine. That terminal CoreStorage command helped tho ^^

All right. Even this is too late, if you are satisfied with the result, that would be great.