Pull up following revision(s) (requested by jmcneill in ticket #209):
sys/fs/msdosfs/msdosfs_vfsops.c: revision 1.70
Remove pm_Heads check in msdosfs_mountfs; this value isn't really used,
FreeBSD and OpenBSD both removed this check years ago, and this makes an
8GB Memory Stick Pro Duo formatted with a PSP work.

(snj)