smartd errors

Folks, recently I have started seeing these messages in /var/log/messages Oct 27 10:26:13 jackstraw smartd[1177]: Device: /dev/sde [SAT], 16 Currently unreadable (pending) sectors Oct 27 10:26:13 jackstraw smartd[1177]: Device: /dev/sde [SAT], 16 Offline uncorrectable sectors which are mounted as follows /dev/sde1 on /media/NSM/NSM-SENSOR-1 type ext4 (rw,nosuid,nodev,noexec,noatime,seclabel,data=ordered) /dev/sde2 on /media/NSM/NSM-SENSOR-2 type ext4 (rw,nosuid,nodev,noexec,noatime,seclabel,data=ordered) I have unmounted the filesystems and run fsck on them and fsck reports no errors. [pgaltieri@jackstraw ~]$ sudo fsck /dev/sde2 fsck from util-linux 2.26.2 e2fsck 1.42.12 (29-Aug-2014) NSM-SENSOR-2: clean, 11/45498368 files, 2905980/181964288 blocks [pgaltieri@jackstraw ~]$ sudo fsck /dev/sde1 fsck from util-linux 2.26.2 e2fsck 1.42.12 (29-Aug-2014) NSM-SENSOR-1: clean, 32/46080000 files, 2993510/184320000 blocks It only reports errors on this drive. Should I be concerned about what smartd is saying? How do I, if possible, correct this? Paolo