"The startup disk cannot be partitioned or restored to a single partition" error in Boot Camp Assistant
boot camp partition을 삭제하려고 했는데 위 에러가 뜨더군요.
아래 링크를 참조해서 작업해 보세요.
https://discussions.apple.com/thread/8210300
명령어
diskutil eraseVolume jhfs+ BC1 disk0s3
diskutil eraseVolume jhfs+ BC2 disk0s4
diskutil mergePartitions jhfs+ BCMP disk0s3 disk0s4