newfs_msdos(8) on OpenBSD
The text 2937719d6d91, as OpenBSD 3.2, OpenBSD 3.1 shipped it.
construct a new MS-DOS (FAT) file system
Flags it lists
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-B -
-F -
-I -
-L -
-N -
-O -
-S -
-a -
-b -
-c -
-e -
-f -
-h -
-i -
-k -
-m -
-n -
-o -
-r -
-s -
-u