well it's a shame again, I finally fixed the problem (apparently) 2 minutes after posting (and I'm on it since monday...)
I finally started the linux OS to test the solution from big scary daemons. And linux complained about unclean shutdown and repaired exactly the hard disk drive partition that I couldn't mount.
So the problem didn't come from FreeBSD.
PS mount_ext2fs isn't installed, but ext2fs seem to mount well (from the console at least)
PPS thanks about MAKEDEV, i just didn't think to man !
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