root@betty:~# fsck -Pvf /dev/wd1g
start /dev/wd1g wait fsck_ffs -P -f /dev/rwd1g
** /dev/rwd1g

CANNOT READ: BLK 115795520
CONTINUE? [yn] y

THE FOLLOWING DISK SECTORS COULD NOT BE READ: 115795520, 115795521, 115795522, 115795523,
fsck: /dev/rwd1g: Floating point exception