Procedure to re-create the error : have a mounted ext2
filesystem - copy data to it (I was using samba).
While the data is flowing - pull the power.
Tried to run fsck from the exec.php page to clean the
file system, the best I get is :
fsck: exec fsck_ext2 for /dev/ad2 in /sbin:/usr/sbin:
No such file or directory
NOTE : The UFS volumes seem to recover fine.