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Disk drive  are  known as  nonvolatile, random  access,  bottom , magnetic, data storage device  and Steps on using Hard Drive Enclosure

Innovated by IBM in 1956  hard disc drives have  diminished  in cost and  forcible  size over the  yrs while dramatically increasing in capacity and speed. Hard disk drives have been the  prevailing  device for  auxiliary storage  of data in general   design computers since the early 1960s. They have maintained this position  because advances in their recording  capacity, cost, reliability, and speed have kept pace with the  essentials  for secondary storage . A  harddisk records data by magnetizing a thin film of ferromagnetic  stuff on a disk. User data is encoded into a run-length limitedcode and the encoded data written as a pattern of sequential magnetic transitions on the disk. The data is represented by the time between transitions. The self-clocking nature of the run-length limited codes used enables the clocking of the data during reads. The data is read from the disk by  discovering  the transitions and then  decoding the written run-length  trammeled  data back to the user data.

The minds are kept from adjoining the platter surface by the air that is extremely close to the platter; that air moves at or near the disk speed. The record and playback head are mounted on a block named a slider, and the surface next to the platter is shaped to keep it just barely out of contact. This forms a type of air bearing. Opposite the actuator at the end of the head support arm is the read-write head (near center in photo); thin printed-circuit cables connect the read-write heads to amplifier electronics mounted at the pivot of the actuator. A flexible, somewhat U shaped, ribbon cable, seen edge-on submission and to the left of the actuator arm keeps the connection to the accountant board on the opposite side of Steps on using Hard Drive Enclosure