How can I mount an FSKit extension? After compiling a sample I tried to run the following: mount -F -t MyFS /dev/disk20 /tmp/mnt mount -F -t MyFS url://1.1.1.1 /tmp/mnt What I usually see in the logs is something like: fskit_helper: [com.apple.FSKit:default] FSKitHelper: /dev/rurl://1.1.1.1: invalid path or fskit_helper: [com.apple.FSKit:default] FSKitHelper: /dev/rdisk20: invalid path