Hard disc device is one or more flexible page that level them with the materials covered that can be given to the magnetic on them recording. This means in addition to the page mentioned above contains the heads, read/write, etc. the mechanism determines the location of the printhead, and the motor is in the compartment, place is given to the pollution in foreign is to be spared. This environment is protected to allows as much as 10 to 25 millionths of an inch from the surface of the page that generally 3600 to 2700 rpm knocks spacing is the volume of data, reliable storage, speed achieve them compared to floppy disks is much greater . In the configuration, hard disks which are new to them also said to be the speed of the spinning disk to 10,000 rpm reaches. Capacity, hard drives are far from the floppy disk, has been every day to capacity, they can be added, For example, now the capacity of the average hard disks about 700 GB. In hard drives, multi-page disk place is given to the rotating disk to more than one page, achieve.