[1] : The Collaborative International Dictionary of English v.0.48

magnetic disc \magnetic disc\, magnetic disk \magnetic disk\n.
   a ditical memory device consisting of a flat disk covered
   with a magnetic coating on which information is stored; a
   hard disk, floppy disk, and diskette are typically
   magnetic disks.

   syn: disk, disc.
        wordnet 1.5
see also:
hard disk floppy disk diskette 

[2] : WordNet (r) 2.0

magnetic disk
     n : computer science a memory device consisting of a flat disk
         covered with a magnetic coating on which information is
         stored syn: magnetic disc, disk, disc
see also:
magnetic disc disk disc 

[3] : The Free On-line Dictionary of Computing (27 SEP 03)

magnetic disk
     
         a flat rotating disc covered on one or both sides
        with some magnetisable material.  the two main types are the
        hard disk and the floppy disk.
     
        small areas or "zones" on a magnetic disk are magnetised.  the
        magnetisation is aligned in one of two opposing orientations
        with respect to the recording head.  the head writes data
        by altering the alignment and reads data by detecting current
        pulses induced in a coil as zones with different magnetic
        alignment pass underneath it.
     
        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
        tracks.  the latter radial movement is known as "seeking".
        there is usually one head for each surface that stores data
        though, for increased performance from reduced rotational
        latency, it is possible, though expensive, to position
        multiple heads at equally spaced angles around the discs.
     
        therefore there are two states that can be detected for each
        zone - a change in alignment, or no change.
     
        ideally a data bit of one or zero can be recorded in each zone
        of magnetisation, however, if a zero represents an absence of
        magnetic change, the detection of several consecutive zeros
        would imply accurately measuring the length of time of the
        absence, i.e., measuring the time between two magnetic
        changes.  however, the variability of motor speed limits the
        number of consecutive zeros which can be read reliably.
     
        the best recording methods accurately follow the
        characteristics of the magnetic and rotational aspects in
        recording the disk, to be as dense as possible in recording
        bits.
     
        compare magnetic drum, compact disc, optical disk,
        magneto-optical disk.
     
        2003-03-10
     
     
see also:
hard disk floppy disk head tracks sectors cylinder 
disk drive heads seeking rotational latency magnetic drum 
compact disc optical disk magneto-optical disk 

Magnetic Disk >> M Words
Magnetic Disk, definition of term: Magnetic Disk
magnetic+disk_pag1.html

Magnetic >> M Words
Magnetic, definition of term: Magnetic
magnetic_pag1.html

Disk >> D Words
Disk, definition of term: Disk
disk_pag1.html

Magnetic Disc >> M Words
Magnetic Disc, definition of term: Magnetic Disc
magnetic+disc_pag1.html

Magnetic Declin >> M Words
Magnetic Declin, definition of term: Magnetic Declin
magnetic+declin_pag1.html

Magnetic Compas >> M Words
Magnetic Compas, definition of term: Magnetic Compas
magnetic+compas_pag1.html

Disk Space >> D Words
Disk Space, definition of term: Disk Space
disk+space_pag1.html

Disk Jockey >> D Words
Disk Jockey, definition of term: Disk Jockey
disk+jockey_pag1.html

Disk Cache >> D Words
Disk Cache, definition of term: Disk Cache
disk+cache_pag1.html

Disk Drive >> D Words
Disk Drive, definition of term: Disk Drive
disk+drive_pag1.html

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