Mac Partition Error (Cannot add new Partition / Bootcamp partition not showing / Spaces don't add up to disk)

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Mac Partition Error (Cannot add new Partition / Bootcamp partition not showing / Spaces don't add up to disk)

So I am trying to add more space to Bootcamp by following this tutorial. But the first red flag came when I went into the partition menu: It doesn't show the partition for Bootcamp. Then I saw that the "free space" part and the "Macintosh HD" don't add up to 1TB, in fact, it is more, and I 100% know for sure that this iMac model that I bought in 2019 is only 1TB. (shown in image)

I decided to add a new partition and set it at 200GB and run it, but then it gave me this error (can't copy paste so the image below)

So I decided to do some googling but didn't see anyone has anything close to this.

I ran `diskutil list` and got this back:

/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI ⁨EFI⁩                     209.7 MB   disk0s1
   2:                 Apple_APFS ⁨Container disk2⁩         870.0 GB   disk0s2
   3:       Microsoft Basic Data ⁨BOOTCAMP⁩                130.0 GB   disk0s3

/dev/disk1 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *28.0 GB    disk1
   1:                        EFI ⁨EFI⁩                     314.6 MB   disk1s1
   2:                 Apple_APFS ⁨Container disk2⁩         27.7 GB    disk1s2

/dev/disk2 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +897.7 GB   disk2
                                 Physical Stores disk1s2, disk0s2
   1:                APFS Volume ⁨Macintosh HD - Data⁩     546.7 GB   disk2s1
   2:                APFS Volume ⁨Macintosh HD⁩            14.9 GB    disk2s2
   3:              APFS Snapshot ⁨com.apple.os.update-...⁩ 14.9 GB    disk2s2s1
   4:                APFS Volume ⁨Preboot⁩                 285.5 MB   disk2s3
   5:                APFS Volume ⁨Recovery⁩                652.6 MB   disk2s4
   6:                APFS Volume ⁨VM⁩                      3.2 GB     disk2s5

/dev/disk3 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *250.0 GB   disk3
   1:             Windows_FAT_32 ⁨KIMI'S USB⁩              250.0 GB   disk3s1

What should I do so that I can partition space from my free space that is in the Macintosh HD drive?

One note is that when I was initially installing Bootcamp, I did force quit bootcamp helper and deleted that partition because it was taking too long, and I reran it afterwards, so that might be the root of the problem

Any help would be appreciated! Thanks

iMac Line (2012 and Later)

Posted on Feb 4, 2022 9:42 AM

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Answer 1

HWTech

Level 9

60,752 points

Feb 5, 2022 8:40 PM in response to kimichenn

I believe you need to use BootCamp Assistant when making any changes to the BootCamp volume, but you need to be very careful because it may break Windows from booting as it will change the position of the Windows boot files. Hopefully another more knowledgeable contributor will stop by to provide better information. I don't use Windows or BootCamp (at least not for many years), but just sharing information I have read on these forums.

The output of your "diskutil" command appears to be missing about 200GB to 300GB which is probably due to aborting BootCamp Assistant which did not create a new partition so that space does not belong to any Container or partition at the moment. It seems that a 130GB partition has been created on just the physical hard drive, but it is hard to say if that is complete and valid. A danger of aborting such a major alteration is it may have left the partitions in an unstable or incomplete state.

Whether aborting BootCamp Assistant damaged the partition table is hard to tell, but I would suggest running First Aid on the "Fusion Drive" item to check (perhaps even each physical drive -- I'm not sure how this works for a Fusion Drive setup). Also, your system is using a Fusion Drive. I don't know if that has any bearing with Windows and BootCamp Assistant. In the future when you use the "diskutil list" command, you should add the "internal" option to only show the internal drives and volumes:

diskutil  list  internal

Make sure to have a good backup of each of your OS volumes before attempting to make any changes. Modifying partitions is a major change that can easily break both macOS and Windows potentially causing you to lose access to the data on both operating systems.

You should always have frequent and regular backups of your computer (each OS) and all external media which contains important and unique data.

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Mac Partition Error (Cannot add new Partition / Bootcamp partition not showing / Spaces don't add up to disk)

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