I agree it's confusing, but it's necessary to exclude these; you can't apply partitioning to any disk with busy (mounted) partitions.
The bug is that we don't tell the user about this and let them unmount them. (I think we used to.)
I agree it's confusing, but it's necessary to exclude these; you can't apply partitioning to any disk with busy (mounted) partitions.
The bug is that we don't tell the user about this and let them unmount them. (I think we used to.)