Have you attempted to boot into safe mode? Have you installed any software or drivers before this happened?
I have samsungs harddrive 1TB as my system OS drive. Which of the 5 options given in the link should I download and are they just download and run or do I need to follow some specific steps?d/load and run the h/drive makers diagnostic utility on the h/drive
Hard Drive Diagnostics Tools and Utilities (Storage) - TACKtech Corp.