<
storage> A flat rotating di
sc covered on one or both
side
s with
some magneti
sable material. The two main type
s are the
hard disk and the
floppy disk.
small area
s or "zone
s" on a magnetic di
sk are magneti
sed. The magneti
sation i
s aligned in one of two oppo
sing orientation
s with re
spect to the recording
head. The
head write
s data by altering the alignment and read
s data by detecting current pul
se
s induced in a coil a
s zone
s with different magnetic alignment pa
ss underneath it. Data i
s stored on either or both
surface
s of di
sc
s in concentric ring
s called "
tracks". Each track i
s divided into a whole number of "
sectors". Where multiple (rigid) di
sc
s are mounted on the
same axle the
set of track
s at the
same radiu
s on all their
surface
s i
s known a
s a "
cylinder". Data i
s read and written by a
disk drive which rotate
s the di
sc
s and po
sition
s the read/write "
heads" over the de
sired track(
s). The latter radial movement i
s known a
s "
seeking". There i
s u
sually one head for each
surface that
store
s data though, for increa
sed performance (from reduced {rotational latency}), it i
s po
ssible, though expen
sive, to po
sition multiple head
s at equally
spaced angle
s around the di
sc
s. Therefore there are two
state
s 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 magneti
sation, however, if a zero repre
sent
s an ab
sence of magnetic change, the detection of
several con
secutive zero
s would imply accurately mea
suring the length of time of the ab
sence, i.e., mea
suring the time between two magnetic change
s. However, the variability of motor
speed limit
s the number of con
secutive zero
s which can be read reliably. The be
st recording method
s accurately follow the characteri
stic
s of the magnetic and rotational a
spect
s in recording the di
sk, to be a
s den
se a
s po
ssible in recording bit
s. Compare
magnetic drum,
compact disc,
optical disk,
magneto-optical disk. (2003-03-10)
style="border-width:thin; border-color:#333333; border-style:dashed; padding:5px;" align="left">In addition suitable contents:
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