Though hard drives are considered to be some of the most robust gadgets around they can and will eventually fail. Failure of such a storage device can mean lost time and effort for businesses and for those who use them for personal applications in the house the same. So where are we in terms of reliability? Far, for hard drives, considering the sweet medley of precise electromechanical parts and microelectronics they are quite reliable.
Factory defects will always be part of technology as well as software/firmware issues but compared to the millions of drives out on the market they can be considered next to bulletproof. Reliability is a real issue for in the range of terabytes, the potential for lost information is indeed huge.