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[macOS Sierra] How can I delete the "OSXRESERVE...

Hi

 

I have Windows 10 install on my Macbook Pro using Boot Camp Assistant. BCA will normally create an 8GB partition called "OSXRESERVED" in FAT32 to store Windows installation files. When I was with El Capitan 10.11, I can easily delete this OSXRESERVED partition using Disk Utility to gain back 8GB to "Macintosh HD".

 

But now I'm with Sierra 10.12. Today I had to delete Windows (using BCA) and install again due to activation issue. And I discover that:

  • During the initial setup of BCA, I've set 88 GB for Boot Camp partition.
  • After the installation has been completed, using Windows Disk Management I can see that BCA did created
    • an OSXRESERVED partition to store Windows installation files, about 8GB in FAT32
    • a BOOTCAMP partition for the installation, about 80GB (I've renamed it to "Windows 10") in NTFS
  • However, I went back to macOS and attempted to use Disk Utility to remove "OSXRESERVED", I could not see it anywhere! The big "pie" only shows me 2 partition: "Macintosh HD" which contains macOS and "Windows 10". The fact is that: partition "Windows 10" as viewed in Disk Utility is 88GB (while on Windows itself, it's only 80GB)

 

I ran 'diskutil list' in Terminal, and here's the result:

/dev/disk0 (internal, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.3 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:          Apple_CoreStorage Macintosh HD            411.4 GB   disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s6

   4:       Microsoft Basic Data Windows 10              88.1 GB    disk0s5

 

As you can see in the column IDENTIFIER, there's the missing of "disk0s3" and "disk0s4". I'm sure that they are:

  • Recovery partition of Windows (which contains a WinPE version, that's common on every Windows installation)
  • OSXRESERVED, which contains Windows installation files.

 

So now I've lost 8GB since neither macOS nor Windows can have any benefit from it .

 

My questions are:

  • Is this a bug of Boot Camp Assistant 6.1.0, or it is designed to be like that? This doesn't happen when I was with El Capitan.
  • How can I safely delete "OSXRESERVED" and give the space back to "Macintosh HD"? I know that it's very risky doing it from Windows because Windows will mess up the LVM layout of macOS

 

Thanks a lot for any of your idea/suggestion

I think I've figured it out: it's the confusion between gibibyte and gigabyte! Also, my correction: the number I saw in Windows is 82 and not 80 .

 

I'm not sure it's described in any documentation, but in Sierra the capacity is displayed in gigabyte by default (10^10 bytes) although macOS also uses gibibyte.

 

The capacity I've chosen in BCA is displayed in gigabyte, so 88 GB in BCA is approximately 82 GiB. But Windows confuses us (for decades!) by telling that the partition is "82 GB". It should be GiB but Windows uses "GB" after the number .

 

Let's say if I want Windows to have 80 GiB, I have to set in BCA something around 86 GB.

 

So my conclusion is: BCA will automatically delete "OSXRESERVED" and give that space back to macOS automatically. The only confusion is between GiB and GB. In El Capitan, gibibyte is used to display by default so there was no confusion.

 

Thanks a lot for all your idea and time

Hi

 

Now something weird happened: after a couple of reboot, the partition "Windows 10" now appears as disk0s4:

/dev/disk0 (internal, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.3 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:          Apple_CoreStorage Macintosh HD            411.4 GB   disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

   4:       Microsoft Basic Data Windows 10              88.1 GB    disk0s4

 

On Windows side, I cannot see "OSXRESERVED" anymore (using Windows Disk Management). Even with Partition Wizard showed no sigh of "OSXRESERVED".

 

I thought that macOS somehow deleted it automatically, but Disk Utility still shows 88GB for "Windows 10" while it's only about 80GB.

 

Quite confused

you shoulld not touch any BCA created partition with DiskUtility !

Bootcamp partitions only with BCA.

etc.

The osxreserved partition is created by BCA, so BCA should be the only one to delete it.

To give it back to the mac, you should use BCA: next time use 80-8GB for creating the bootcamp partition and then delete the 8GB part.

I think I've figured it out: it's the confusion between gibibyte and gigabyte! Also, my correction: the number I saw in Windows is 82 and not 80 .

 

I'm not sure it's described in any documentation, but in Sierra the capacity is displayed in gigabyte by default (10^10 bytes) although macOS also uses gibibyte.

 

The capacity I've chosen in BCA is displayed in gigabyte, so 88 GB in BCA is approximately 82 GiB. But Windows confuses us (for decades!) by telling that the partition is "82 GB". It should be GiB but Windows uses "GB" after the number .

 

Let's say if I want Windows to have 80 GiB, I have to set in BCA something around 86 GB.

 

So my conclusion is: BCA will automatically delete "OSXRESERVED" and give that space back to macOS automatically. The only confusion is between GiB and GB. In El Capitan, gibibyte is used to display by default so there was no confusion.

 

Thanks a lot for all your idea and time

good work !

but the main point stays: everything you want to do with and to the bc partition, BCA is the way.

最後更新：2017-10-02 21:22:11

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