What is Hard disk?

Three are fewer precautions for hard disks since they are more protected by being seated in air tight cases. But when damage does occur it is a more serious matter. Larger amount of data a be list and hard disks are much more expensive that floppy disks. Hard disks can have problems from magnetic fields and heat like floppies do, but these are very rare. Most problems occur when the read write head damage the metal disk by hitting or even just touching it. This is called a head crash. When the computer is on the hard disk is spinning extremely fast. Any contact all can cause pits or scratches. Every scratch or pit is lost data. Damage in the foot directory turn the whole hard disk in to a lovely doorstop. It is completely dead. So the goal there is to keep that read write head where it belongs, just barely above the hard disk, but never ever touching it.