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My issue is similar to this one, Bootcamp says Disk Could Not Be Partitioned on Catalina Version 10.15.2

I'm on a 2019 iMac i9 27" with a 3TB Fusion that's been formatted with Catalina and APFS from the beginning, but I have successfully installed Bootcamp and removed it. Now I'm trying to play games that don't work in a VM and want it back.

Bootcamp is failing to create the partition and corrupting the APFS container as it unwinds. Actually, it's creating the partitions but gacking at some point. The question above has the fsck_apfs commands I've been looking for, but I'm looking beyond that.

What if, prior to reloading, I created the APFS container AND a smaller HPS/NTFS/FAT32 partition for Bootcamp Assistant to use? A "sacrifice" disk if you will.

Does it matter if the partition is created first, in the first sectors of the drive or at the end behind the APFS container?

This time, I plan to only do a MacOS install and not a recovery to test if this works. If so, I'll either restore directly to it or blow everything away again and do a full restore from the ground up with the extra partition.

  • This comment was from Roger Benson: My issue turned out to be Fusion drive issues that necessitated doing a diskutil resetFusion and blowing EVERYTHING away, recreate the APFS container, and reload. – David Anderson Jul 26 '20 at 23:14
  • It would be helpful, if you could post your comment as an answer. If would also if you could return and accept your answer so other would know a solution was found. – David Anderson Jul 26 '20 at 23:16
  • The Boot Camp Assistant only works under limited partition arrangements. Creating your own partition would be an arrangement the Boot Camp Assistant would not accept. – David Anderson Jul 26 '20 at 23:19
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My issue turned out to be Fusion drive issues that necessitated doing a diskutil resetFusion and blowing EVERYTHING away, recreate the APFS container, and reload. Painful, but I now have a Windows partition running. And yes, Bootcamp Assistant totally ignored everything but the APFS container.

Closest thing I could find to my issue: https://support.apple.com/en-us/HT207584

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