Magnetic Disks :: essays research papers fc

Magnetic Disks(Hard Disk)The topic of charismatic dishs is one that involves many natural philosophy related phenomenon. The intricate structure and contrive of Magnetic Disks (or hard disks) in ready reckoners include the principles of Fluid Flow, Rotational Motion, Electromagnetism, and more. This report will focus mainly on the previously listed aperients occurrences, and the forge that goes into engineering the charismatic disk to include them. These physics principles argon utilized in such a way that makes the hard disk a very common and useful tool, in this day and age. To around people, the charismatic disk is the most important, yet most mysterious, part of a reckoner system. A hard disk is a seal unit that holds computer data in the form of magnetic patterns.Before understanding the physics principles, one must understand the physical design that induces them. A magnetic disk is a flat, circular, rigid sheet of aluminum coated with a layer of magnetic 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 dubiousness writes information along concentric tracks (circular paths traced out by motion of the disk) on it. Multiple disks can be stacked to store more information. typically (1985) 11 disks with 22 muster ups, of which 20 are used (minus top/bottom), are manipulated to read/write data.The head, or device used to reassign 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 around the conductor. This magnetic field then can influence the disks magnetic material. The head is driven by an electric motor, using electromagnetism, to exert displace and pulling forces on magnets to the rotating shaft. In some cases the head moves to a require area on the dis k, and the motion of the magnetized surface induces tiny electric potential. This voltage is concentrated in the coil of the read head, and can be interpret as the data stored on the magnetic disk. When the direction of the flow of electric current is reversed, the magnetic fields polarity is reversed.The head is mount 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 gradient with the surface and air.