mdconfig(8) on FreeBSD
The text 17b4d7a22f8f, as FreeBSD 9.0-RELEASE shipped it.
configure and enable memory disks
Flags it lists
-
-S -
-a -
-d -
-f -
-l -
-n -
-o -
-s -
-t -
-u -
-x -
-y