A drive may change status to "(Foreign) Unconfigured Bad" if it was removed by accident from the RAID enclosure while the system was running and inserted back in.
It may also change the status if a drive from another system was inserted to that slot. If this is the case, make sure to re-insert the correct driver to the correct slot. Check the system's serial number at the bottom of the tray to confirm which system does the drive belongs to.
Otherwise follow the procedure attached.
Note that this procedure also explains how to silence the beeping alarm.