magnetic disks - definitie. Wat is magnetic disks
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Wat (wie) is magnetic disks - definitie

U.S. COMPUTER PROGRAMMER (1952-2007)
Fish disks

magnetic disk         
  • HP-41-series]] (from 1979) could store data via an external magnetic tape storage device on [[microcassette]]s
  • Hard drives use magnetic memory to store giga- and terabytes of data in computers.
STORAGE OF DATA ON A MAGNETIZED MEDIUM
Magnetic medium; Magnetic recording; Magnetic disk; Magnetic Disk; Magnetic Recording; Magnetic media; Magnetic Media; Magnetic Storage; Magnetic disk access time; Longitudinal magnetic recording; Longitudinal Magnetic Recording; Longitudinal recording; Longitudinal Recording; Shingled Recording; Magnetic data storage; Longitudinal recording mode; Horizontal recording mode; Horizontal recording; History of magnetic storage; 100 tpi; 48 tpi; 96 tpi
<storage> A flat rotating disc covered on one or both sides with magnetisable material. The two main types are the {hard disk} and the floppy disk. Data is stored on either or both surfaces of discs in concentric rings called "tracks". Each track is divided into a whole number of "sectors". Where multiple (rigid) discs are mounted on the same axle the set of tracks at the same radius on all their surfaces is known as a "cylinder". Data is read and written by a disk drive which rotates the discs and positions the read/write heads over the desired track(s). The latter radial movement is known as "seeking". There is usually one head for each surface that stores data. To reduce rotational latency it is possible, though expensive, to have multiple heads at different angles. The head writes binary data by magnetising small areas or "zones" of the disk in one of two opposing orientations. It reads data by detecting current pulses induced in a coil as zones with different magnetic alignment pass underneath it. In theory, bits could be read back as a time sequence of pulse (one) or no pulse (zero). However, a run of zeros would give a prolonged absence of signal, making it hard to accurately divide the signal into individual bits due to the variability of motor speed. Run Length Limited is one common solution to this clock recovery problem. High speed disks have an access time of 28 milliseconds or less, and low-speed disks, 65 milliseconds or more. The higher speed disks also transfer their data faster than the slower speed units. The disks are usually aluminium with a magnetic coating. The heads "float" just above the disk's surface on a current of air, sometimes at lower than atmospheric pressure in an air-tight enclosure. The head has an aerodynamic shape so the current pushes it away from the disk. A small spring pushes the head towards the disk at the same time keeping the head at a constant distance from the disk (about two microns). Disk drives are commonly characterised by the kind of interface used to connect to the computer, e.g. ATA, IDE, SCSI. See also winchester. Compare magnetic drum, {compact disc}, optical disk, magneto-optical disk. Suchanka's PC-DISK library (http://pc-disk.de/). (2007-06-14)
magnetic field         
  • [[Hans Christian Ørsted]], ''Der Geist in der Natur'', 1854
  • A sketch of Earth's magnetic field representing the source of the field as a magnet. The south pole of the magnetic field is near the geographic north pole of the Earth.
  • A [[Solenoid]] with electric current running through it behaves like a magnet.
  • '''M'''}} inside and outside a cylindrical bar magnet.
SPATIAL DISTRIBUTION OF VECTORS ALLOWING THE CALCULATION OF THE MAGNETIC FORCE ON A TEST PARTICLE
Magnetic flux density; B-Field; B-field; Magnetic field density; Magnetic Field; Magnetic field strength; Magnetic force field; Nonlinear magnetic field; Magnetic fields; Magnetic Flux Density; H-field; Magnatic field; B-fields; Magnetic field lines; Magnetic field line; Magnetizing field; Auxiliary magnetic field; H field; Effective magnetic field; Potential magnetic field; Magnetic field intensity; Strong magnetic field; Magnetic field energy density; Magnetic Field Energy Density; Magnetic field vector; Magnetic lines of force; Amperes per meter; Amperes per metre; Applied magnetic field; Ampere per metre; Magnetic vector
(magnetic fields)
A magnetic field is an area around a magnet, or something functioning as a magnet, in which the magnet's power to attract things is felt.
N-COUNT
Magnetic Lines of Force         
  • [[Hans Christian Ørsted]], ''Der Geist in der Natur'', 1854
  • A sketch of Earth's magnetic field representing the source of the field as a magnet. The south pole of the magnetic field is near the geographic north pole of the Earth.
  • A [[Solenoid]] with electric current running through it behaves like a magnet.
  • '''M'''}} inside and outside a cylindrical bar magnet.
SPATIAL DISTRIBUTION OF VECTORS ALLOWING THE CALCULATION OF THE MAGNETIC FORCE ON A TEST PARTICLE
Magnetic flux density; B-Field; B-field; Magnetic field density; Magnetic Field; Magnetic field strength; Magnetic force field; Nonlinear magnetic field; Magnetic fields; Magnetic Flux Density; H-field; Magnatic field; B-fields; Magnetic field lines; Magnetic field line; Magnetizing field; Auxiliary magnetic field; H field; Effective magnetic field; Potential magnetic field; Magnetic field intensity; Strong magnetic field; Magnetic field energy density; Magnetic Field Energy Density; Magnetic field vector; Magnetic lines of force; Amperes per meter; Amperes per metre; Applied magnetic field; Ampere per metre; Magnetic vector
Lines of force indicating the distribution of magnetic force, which is due presumably to whirls of the ether. A wire or conductor through which a current is passing is surrounded by an electro-magnetic field of force, q. v., whose lines of force form circles surrounding the conductor in question. A magnet marks the existence of a similar electro-magnetic field of force whose lines form circuits comprising part of and in some places all of the body of the magnet, and which are completed through the air or any surrounding paramagnetic or diamagnetic body. They may be thought of as formed by the Ampérian sheet of current, and analogous to those just mentioned as surrounding a conductor. Fig. 223. MAGNETIC LINES OF FORCE, DIRECTION OF. A magnetic line of force may be thought of as a set of vortices or whirls, parallel to each other, and strung along the line of force which is the locus of their centres. If as many lines are drawn per square centimeter as there are dynes (per unit pole) of force at the point in question, each such line will be a unitary c. g. s. line of force.

Wikipedia

Fred Fish

Fred Fish (November 4, 1952 – April 20, 2007) was a computer programmer notable for work on the GNU Debugger and his series of freeware Fish disks for the Amiga. The Fish Disks (term coined by Perry Kivolowitz at a Jersey Amiga User Group meeting) became the first national rallying point, a sort of early postal system. Fish would get his disks off around the world in time for regional and local user group meetings who in turn duplicated them for local consumption. Typically, only the cost of materials changed hands. The Fish Disk series ran from 1986 to 1994. In it, one can chart the growing sophistication of Amiga software and see the emergence of many software trends.

The Fish Disks were distributed at computer stores and Amiga enthusiast clubs. Contributors submitted applications and source code and the best of these each month were assembled and released as a diskette. Since the Internet was not yet in popular usage outside military and university circles, this was a primary way for enthusiasts to share work and ideas. He also initiated the "GeekGadgets" project, a GNU standard environment for AmigaOS and BeOS.

Fish worked for Cygnus Solutions in the 1990s before he left for Be Inc. in 1998.

In 1978, he self-published User Survival Guide for TI-58/59 Master Library, which was advertised in enthusiast newsletters covering the TI-59 programmable calculator.