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I bought a new iMac (Retina 4K, 21.5-inch, 2017, with macOS High Sierra 10.13.5) and used Boot Camp to install Windows 10 on it. The Boot Camp drivers seem to have been installed successfully, and most things seem to work, but I am unable to access the Mac partition from Windows.

According to what I have read, the Boot Camp drivers are supposed to have a read-only driver for HFS+, but "Macintosh HD" does not show up for me.

I've read that FileVault could be the problem, but I double-checked, and FileVault is not enabled.

Then I read that the problem might be because of something called Core Storage. So I tried to follow these instructions to revert the partition. However, that only works if Revertible is Yes, and in my case, it is No.

CoreStorage logical volume groups (1 found) | +-- Logical Volume Group 9C641579-4351-491E-923A-B2DA1CF80C12 ========================================================= Name: Macintosh HD Status: Online Size: 724916166656 B (724.9 GB) Free Space: 81920 B (81.9 KB) | +-< Physical Volume 123FF2CC-8363-4551-AEF2-535FAABDA521 | ---------------------------------------------------- | Index: 0 | Disk: disk1s2 | Status: Online | Size: 27551166464 B (27.6 GB) | +-< Physical Volume 52D21296-80AE-4BC8-BA5F-583E65C62B42 | ---------------------------------------------------- | Index: 1 | Disk: disk0s2 | Status: Online | Size: 697365000192 B (697.4 GB) | +-> Logical Volume Family 9619CA26-4D92-43F6-AC54-3E10E7F774A0 ---------------------------------------------------------- Encryption Type: None | +-> Logical Volume CF6F0197-EDB6-4DC3-B3C4-C22A3DC99D2C --------------------------------------------------- Disk: disk2 Status: Online Size (Total): 724000440320 B (724.0 GB) Revertible: No LV Name: Macintosh HD Volume Name: Macintosh HD Content Hint: Apple_HFS LVG Type: Fusion, Sparse

So, what can I do?

Additional information: Here is the result of running diskutil info /:

``` Device Identifier: disk2 Device Node: /dev/disk2 Whole: Yes Part of Whole: disk2 Device / Media Name: APPLE HDD HTS541010A9E632

Volume Name: Macintosh HD Mounted: Yes Mount Point: /

Content (IOContent): Apple_HFS File System Personality: Journaled HFS+ Type (Bundle): hfs Name (User Visible): Mac OS Extended (Journaled) Journal: Journal size 81920 KB at offset 0x183df000 Owners: Enabled

OS Can Be Installed: Yes Booter Disk: disk0s3 Recovery Disk: disk0s3 Media Type: Generic Protocol: PCI-Express SMART Status: Not Supported Volume UUID: F7E21D0B-FE27-3F1E-AF88-6B86912A95F6 Disk / Partition UUID: CF6F0197-EDB6-4DC3-B3C4-C22A3DC99D2C

Disk Size: 724.0 GB (724000440320 Bytes) (exactly 1414063360 512-Byte-Units) Device Block Size: 4096 Bytes

Volume Total Space: 724.0 GB (724000440320 Bytes) (exactly 1414063360 512-Byte-Units) Volume Used Space: 29.6 GB (29556273152 Bytes) (exactly 57727096 512-Byte-Units) (4.1%) Volume Free Space: 694.4 GB (694444167168 Bytes) (exactly 1356336264 512-Byte-Units) (95.9%) Allocation Block Size: 4096 Bytes

Read-Only Media: No Read-Only Volume: No

Device Location: Internal Removable Media: Fixed

Solid State: Yes Virtual: Yes Hardware AES Support: No

This disk is a Core Storage Logical Volume (LV). Core Storage Information: LV UUID: CF6F0197-EDB6-4DC3-B3C4-C22A3DC99D2C LVF UUID: 9619CA26-4D92-43F6-AC54-3E10E7F774A0 LVG UUID: 9C641579-4351-491E-923A-B2DA1CF80C12 PV UUID (disk): 123FF2CC-8363-4551-AEF2-535FAABDA521 (disk1s2) PV UUID (disk): 52D21296-80AE-4BC8-BA5F-583E65C62B42 (disk0s2) Fusion Drive: Yes Encrypted: No ```

And here are a couple of screenshots from Disk Utility:

Disk Utility Disk Utility

Also, here is the Windows version:

enter image description here

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  • Just to make sure, your OSX partition is using HFS+ and not APFS ? The content hint says it uses HFS+, but still wondering. APFS is not directly readable, one needs to use a driver provided by Paragon Software – Jean Rostan Jun 29 '18 at 20:19
  • @JeanRostan I don't know; how do I find out? I bought it about a week ago, and I haven't intentionally changed anything about the file system, other than using Boot Camp to partition it. – user31708 Jun 29 '18 at 21:23
  • Use this diskutil info / and look under type or just use graphical disk utility inside utilities folder under your apps – Jean Rostan Jun 29 '18 at 21:27
  • @JeanRostan It looks like HFS+ to me. I've updated the original question with this information. – user31708 Jun 29 '18 at 21:44
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If you installed Windows 10 from an ISO that was released after the Anniversary Update was released, then this is normal. The HFS+ drivers that are made by Apple do not work on the Anniversary Update and later.

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  • It's whatever Microsoft is selling on their website right now. According to the Settings application it is "Version 1803", whatever that means. – user31708 Jun 29 '18 at 22:11
  • Correct me if I'm wrong, but I think Anniversary update was 1604, so it will probably not work on your installation. – pixelomer Jun 29 '18 at 22:13
  • Does any other vendor make HFS+ drivers that will work on the current version of Windows? Or will I still have a problem with "Core Storage" even with third-party drivers? – user31708 Jun 29 '18 at 22:14
  • I can't give much information because I never used one, but you can try Paragon's driver or Transmac's software (NOT driver). Neither of them is free but they have trials. – pixelomer Jun 29 '18 at 22:16
  • I checked Paragon's website, and it said their driver does not work with Fusion Drive. Since my Mac has Fusion Drive, it looks like I can't use the Paragon driver. – user31708 Jun 29 '18 at 22:23

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