While the hard drive is so important, it is one of the most fragile parts on the computer. The weight contained on it will also be lost, and can greatly affect your work.
If asked if the part of the computer that is broken can affect you the most, it probably means that it is the hard drive, because if the hard drive is broken, how much data is lost. So check and diagnose by the help of the free utilities below that will help you prevent it in time. The hard drive contains all the important information and data, so it's a 'nightmare' if the hard drive fails and the entire data is 'gone'.