Magnetic Disks :: essays research papers fc

Magnetic Disks(Hard Disk)The effect of magnetic books is one that involves many physics related phenomenon. The intricate social structure and design of Magnetic Disks (or hard dish antennas) in computers include the principles of Fluid Flow, rotational Motion, Electromagnetism, and to a greater extent. This paper will focus mainly on the previously listed physics occurrences, and the design that goes into engineering the magnetic criminal record to include them. These physics principles be utilized in such a way that makes the hard disk a very common and useful tool, in this day and age. To nearly people, the magnetic disk is the most important, yet most mysterious, part of a computer system. A hard disk is a seal social unit that holds computer data in the form of magnetic patterns.Before intelligence the physics principles, one must understand the physical design that induces them. A magnetic disk is a flat, circular, rigid sheet of aluminum surface with a layer of magne tic material (can be double sided). The material usually is a form of iron oxide with various other elements added. The disk rotates upon a central axis and a movable read/ write organise writes information along concentric tracks (circular paths traced out by apparent motion of the disk) on it. Multiple disks can be stacked to store more information. Typically (1985) 11 disks with 22 surfaces, of which 20 are apply (minus peak/bottom), are manipulated to read/write data.The head, or device used to transmit data onto the magnetic disks, is an important part of the hard disk and composes most of the physics happenings. Current is passed through the head or in the physics case, the conductor, to produce a magnetic field or so the conductor. This magnetic field then can influence the disks magnetic material. The head is driven by an electric motor, using electromagnetism, to utilize pushing and pulling forces on magnets to the rotating shaft. In some cases the head moves to a re quired area on the disk, and the motion of the magnetized surface induces piffling voltage. This voltage is concentrated in the coil of the read head, and can be interpreted as the data stored on the magnetic disk. When the direction of the operate of electric current is reversed, the magnetic fields polarity is reversed.The head is mounted in a slipper (or holder) positioned above the disk at 0.5-2.5 microns from the surface. When the disk is revolving around its axis, an air current creates a velocity side with the surface and air.