magnetic disk - définition. Qu'est-ce que magnetic disk
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Qu'est-ce (qui) est magnetic disk - définition

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
  • 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.
  • Longitudinal recording and [[perpendicular recording]], two types of writing heads on a hard disk

magnetic disk         
<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 storage         
Magnetic storage or magnetic recording is the storage of data on a magnetized medium. Magnetic storage uses different patterns of magnetisation in a magnetizable material to store data and is a form of non-volatile memory.
History of IBM magnetic disk drives         
  • U.S. Army Red River Arsenal]], with two IBM 350 disk drives in the foreground
  • IBM 1311 Disk Drives – Model 2 (slave) & Model 3 (master)
  • IBM 3380 disk drive module
  • A British IBM 0665-30 hard disk exposed, possibly manufactured in 1985. (A head crash has occurred)
  • IBM 1311 disk drive with IBM 1316 removable disk pack at the [[Computer History Museum]]
  • IBM 2311 Disk Storage Drive, with its six platters
  • IBM 2314
  • IBM 2314s at the University of Michigan. Note removable [[disk pack]]s and empty covers on top of the drives
  • IBM 2315 disk cartridge
  • RAMAC mechanism at [[Computer History Museum]]
  • 9335 drive
  • 3D artist's concept of an IBM 3330 Direct Access Storage Facility. Shown are three 3330s and one 3333 (on the right)
ASPECT OF HISTORY
IBM 355; IBM 350; IBM 1301; IBM 1311; IBM 1405; IBM 1302; IBM 2311; IBM 2314; IBM 2310; IBM 3330; IBM 3350; IBM 3380; IBM 3390; IBM 353; Winchester drive; Winchester disk; IBM 3340; Early ibm disk storage; Early IBM disk storage; IBM magnetic disk drives; History of IBM storage devices; History of IBM disk storage devices; IBM 2305; Single Large Expensive Disk; IBM 3310; IBM 7300; IBM 2302; IBM 2319; IBM 3370; IBM 3375; IBM 9340; IBM 9345; IBM 9330 Family; IBM 5444; IBM 0661; IBM 0662; IBM 0663; IBM 0664; IBM 0665; IBM 0667; IBM 0669; IBM 0671; IBM 0676; IBM 0680; IBM 0681; IBM 2315; IBM 1316; IBM 3333; Winchester Disk; Winchester Drive; Winchester technology; Winnie (hard disk); IBM 2820
IBM manufactured magnetic disk storage devices from 1956 to 2003, when it sold its hard disk drive business to Hitachi. Both the hard disk drive (HDD) and floppy disk drive (FDD) were invented by IBM and as such IBM's employees were responsible for many of the innovations in these products and their technologies.

Wikipédia

Magnetic storage

Magnetic storage or magnetic recording is the storage of data on a magnetized medium. Magnetic storage uses different patterns of magnetisation in a magnetizable material to store data and is a form of non-volatile memory. The information is accessed using one or more read/write heads.

Magnetic storage media, primarily hard disks, are widely used to store computer data as well as audio and video signals. In the field of computing, the term magnetic storage is preferred and in the field of audio and video production, the term magnetic recording is more commonly used. The distinction is less technical and more a matter of preference. Other examples of magnetic storage media include floppy disks, magnetic tape, and magnetic stripes on credit cards.