$ umount /Volumes/UNTITLED $ sudo ./wbfs -p /dev/disk4s1 init $ sudo ./wbfs -p /dev/disk4s1 df wbfs tot:298.08G used:0.08G free:298.00G $ sudo ./wbfs -p /dev/disk4s1 ls wbfs empty Then just use WBFS for macos X to add in the backup images you’ve created previously.