https://forums.freebsd.org/threads/62985/
Code:
root@nofapp:~ # smartctl -a /dev/ada0 | grep Reallocated_Sector
5 Reallocated_Sector_Ct 0x0033 100 100 005 Pre-fail Always - 1
root@nofapp:~ # smartctl -a /dev/ada1 | grep Reallocated_Sector
5 Reallocated_Sector_Ct 0x0033 100 100 005 Pre-fail Always - 0