http://h34nug3iwqjf2376fmmzdhgqivckzemcujmarlptfqeqtq7vya47yyad.onion/2008/10/12/smartmontools-control-the-health-of-your-hard-disk/index.html
If it is, on the other hand, a single disc in a laptop, check if you have an actualized backup, first, and run to the vendor for a replacement disc, second. However, I use to substitute hard discs in advance when they start to show bad values in Old_age attributes, like 10000 in Start_Stop_Count (raw value) for a desktop, or 20000-30000 hours in Power_On_Seconds (depending on disc quality).