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Trying to install Win10 on my iMac 27 late 2015 with 1TB Fusion drive running Mojave 10.14.5
but every time it get stuck in "Partitioning disk..." with the progress meter at about 50%.
I've tried both October and April versions of Windows with the same result. And I've tested creating a FAT partition in the disk utility and that worked. Also tried erasing the entire drive and re-installing Mojave.
iMac Line (2012 and Later)
You have both OSXRESERVED and BOOTCAMP partition. Run
In your specific case, given the current state, try
diskutil eraseVolume jhfs+ BC1 disk0s3
diskutil eraseVolume jhfs+ BC2 disk0s4
diskutil mergePartitions jhfs+ BCMP disk0s3 disk0s4
diskutil list
If you see only disk0s3 as the last entry under disk0, then run
diskutil eraseVolume fat32 BOOTCAMP disk0s3
and retry removing the partition using BC Assistant only.
Modifying partitions after installing Windows can cause booting issues with Windows. Be careful.
Boot camp stuck on Partitioning disk...
