mdconfig(8) on FreeBSD
The text 4dddf2e1b8f1, as FreeBSD 5.2.1-RELEASE, FreeBSD 5.2-RELEASE shipped it.
configure and enable memory disks
Flags it lists
-
-S -
-a -
-d -
-f -
-l -
-n -
-o -
-s -
-t -
-u -
-x -
-y