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Warning: those guides are mostly obsolete, please have a look at the new documentation.


Rescuing a FreeBSD 8 system with an FreeBSD 10 installation media
Mount the root file system read-write,
sudo su -
dmesg | grep ^ad
ls -l /dev/ada0*
bsdlabel /dev/ada0s1
fsck_4.2bsd /dev/ada0s1a
#fsck_4.2bsd -y /dev/ada0s1a
umount /mnt
mount /dev/ada0s1a /mnt
and proceed with your changes.

(obsolete, see the new doc)