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I am unable to reclaim 1 TB of Unallocated Space to my main HD. Neither Disk Utility or BC-Assistant succeeds in restoring it to a single partition.

Disk utility error message

The underlying issue (after running sudo diskutil apfs resizecontainer disk1s2 0) seems to be the following:

Output of: sudo diskutil apfs resizecontainer disk1s2 0

enter image description here

Disk Utility unallocated space

The process starts and fails, please is there anyway to get my 1 TB back to my main HD?

I cannot see the 1 TB Unallocated Space in 'diskutil list':

diskutil list output

Please, can someone explain what needs to be done to get the 1 TB back? My main HD is a fusion drive and should be 2 TB.

Output of diskutil info disk1s2 | grep -e Size -e Offset

Output of diskutil info disk1s2 | grep -e Size -e Offset

Terminal: sudo diskutil apfs resizecontainer disk1s2 0 gives exactly same error as Disk Utility when it fails.

Please, help me. How can I resize the container back to 2 TB and get the Unallocated Space left from the now erased former BootCamp partition that BC-assistant/DiskUtility cannot re-allocate back?

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  • Did you run First Aid from within Disk Utility to check and fix the error?
    – David Anderson
    Commented Oct 8, 2020 at 11:17
  • Hi David, thanks for input - Yes I have tried Disk Utility, it fails when select the (-) to merge the Unallocated Space with my main HD. I have also tried to check and fix error within Disk Utility. I am wondering if this has something to do with me having to run sudo gpt -vv -r and finding where the empty space is, then somehow allocate it to a partition. (Btw you the founder of Driveinfo?, just tried downloading it)
    – Smeagol
    Commented Oct 8, 2020 at 11:59
  • You don't need gpt or driveinfo. You can get same information by entering diskutil info disk1s2 | grep -e Size -e Offset
    – David Anderson
    Commented Oct 8, 2020 at 12:11
  • I ran the command and updated my question with the output. I wish I knew what to do know with the information? Can you please guide me further?
    – Smeagol
    Commented Oct 8, 2020 at 12:16
  • The command should be sudo diskutil apfs resizecontainer disk1s2 0. If does not work, you can try restarting the Mac and seeing if the output from diskutil list has changed.
    – David Anderson
    Commented Oct 8, 2020 at 12:32

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