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1. The Free On-line Dictionary of Computing (30 December 2018) |
disk drive
FDD
floppy disk drive
floppy drive
(Or "hard disk drive", "hard drive",
"floppy disk drive", "floppy drive") A peripheral device
that reads and writes hard disks or floppy disks. The
drive contains a motor to rotate the disk at a constant rate
and one or more read/write heads which are positioned over the
desired track by a servo mechanism. It also contains the
electronics to amplify the signals from the heads to normal
digital logic levels and vice versa.
In order for a disk drive to start to read or write a given
location a read/write head must be positioned radially over
the right track and rotationally over the start of the right
sector.
Radial motion is known as "seeking" and it is this which
causes most of the intermittent noise heard during disk
activity. There is usually one head for each disk surface and
all heads move together. The set of locations which are
accessible with the heads in a given radial position are known
as a "cylinder". The "seek time" is the time taken to
seek to a different cylinder.
The disk is constantly rotating (except for some floppy disk
drives where the motor is switched off between accesses to
reduce wear and power consumption) so positioning the heads
over the right sector is simply a matter of waiting until it
arrives under the head. With a single set of heads this
"rotational latency" will be on average half a revolution
but some big drives have multiple sets of heads spaced at
equal angles around the disk.
If seeking and rotation are independent, access time is seek
time + rotational latency. When accessing multiple tracks
sequentially, data is sometimes arranged so that by the time
the seek from one track to the next has finished, the disk has
rotated just enough to begin accessing the next track.
See also sector interleave.
Early disk drives had a capacity of a few megabytes and were
housed inside a separate cabinet the size of a washing
machine. Over a few decades they shrunk to fit a terabyte
or more in a box the size of a paperback book.
The disks may be removable disks; floppy disks always are,
removable hard disks were common on mainframes and
minicomputers but less so on microcomputers until the mid
1990s(?) with products like the Zip Drive.
A CD-ROM drive is not usually referred to as a disk drive.
Two common interfaces for disk drives (and other devices) are
SCSI and IDE. ST-506 used to be common in
microcomputers (in the 1980s?).
(1997-04-15)
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Common Misspellings > |
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drive f,loppy disk drive f.oppy disk drive fl.oppy disk drive f.loppy disk drive fl9ppy disk drive flo9ppy disk drive fl9oppy disk drive fl(ppy disk drive flo(ppy disk drive fl(oppy disk drive fl0ppy disk drive flo0ppy disk drive fl0oppy disk drive flippy disk drive floippy disk drive flioppy disk drive flpppy disk drive flopppy disk drive flpoppy disk drive flkppy disk drive flokppy disk drive flkoppy disk drive fllppy disk drive flolppy disk drive flloppy disk drive flappy disk drive fleppy disk drive fluppy disk drive flo00y disk drive flop00y disk drive flo00py disk drive flo))y disk drive flop))y disk drive flo))py disk drive floooy disk drive flopooy disk drive flooopy disk drive flolly disk drive floplly disk drive flollpy disk drive flopp6 disk drive floppy6 disk drive flopp6y disk drive flopp^ disk drive floppy^ disk drive flopp^y disk drive flopp7 disk drive floppy7 disk drive flopp7y disk drive floppt disk drive floppyt disk drive floppty disk drive floppu disk drive floppyu disk drive floppuy disk drive floppg disk drive floppyg disk drive floppgy disk drive flopph disk drive floppyh disk drive flopphy disk drive floppj disk drive floppyj disk drive floppjy disk drive floppy wisk drive floppy dwisk drive floppy wdisk drive floppy eisk drive floppy deisk drive floppy edisk drive floppy risk drive floppy drisk drive floppy rdisk drive floppy sisk drive floppy dsisk drive floppy sdisk drive floppy fisk drive floppy dfisk drive floppy fdisk drive floppy xisk drive floppy dxisk drive floppy xdisk drive floppy cisk drive floppy dcisk drive floppy cdisk drive floppy visk drive floppy dvisk drive floppy vdisk drive floppy isk drive floppy d isk drive floppy disk drive floppy d8sk drive floppy di8sk drive floppy d8isk drive floppy d*sk drive floppy di*sk drive floppy d*isk drive floppy d9sk drive floppy di9sk drive floppy d9isk drive floppy dusk drive floppy diusk drive floppy duisk drive floppy dosk drive floppy diosk drive floppy doisk drive floppy djsk drive floppy dijsk drive floppy djisk drive floppy dksk drive floppy diksk drive floppy dkisk drive floppy dlsk drive floppy dilsk drive floppy dlisk drive floppy dask drive floppy desk drive floppy diqk drive floppy disqk drive floppy diqsk drive floppy diwk drive floppy diswk drive floppy diwsk drive floppy diek drive floppy disek drive floppy diesk drive floppy diak drive floppy disak drive floppy diask drive floppy didk drive floppy disdk drive floppy didsk drive floppy dizk drive floppy diszk drive floppy dizsk drive floppy dixk drive floppy disxk drive floppy dixsk drive floppy dick drive floppy disck drive floppy dicsk drive floppy di k drive floppy dis k drive floppy di sk drive floppy disu drive floppy disku drive floppy disuk drive floppy disi drive floppy diski drive floppy disik drive floppy diso drive floppy disko drive floppy disok drive floppy disj drive floppy diskj drive floppy disjk drive floppy disl drive floppy diskl drive floppy dislk drive floppy dism drive floppy diskm drive floppy dismk drive floppy dis, drive floppy disk, drive floppy dis,k drive floppy dis. drive floppy disk. drive floppy dis.k drive floppy disk wrive floppy disk dwrive floppy disk wdrive floppy disk erive floppy disk derive floppy disk edrive floppy disk rrive floppy disk drrive floppy disk rdrive floppy disk srive floppy disk dsrive floppy disk sdrive floppy disk frive floppy disk dfrive floppy disk fdrive floppy disk xrive floppy disk dxrive floppy disk xdrive floppy disk crive floppy disk dcrive floppy disk cdrive floppy disk vrive floppy disk dvrive floppy disk vdrive floppy disk rive floppy disk d rive floppy disk drive floppy disk d4ive floppy disk dr4ive floppy disk d4rive floppy disk d$ive floppy disk dr$ive floppy disk d$rive floppy disk d5ive floppy disk dr5ive floppy disk d5rive floppy disk deive floppy disk dreive floppy disk derive floppy disk dtive floppy disk drtive floppy disk dtrive floppy disk ddive floppy disk drdive floppy disk ddrive floppy disk dfive floppy disk drfive floppy disk dfrive floppy disk dgive floppy disk drgive floppy disk dgrive floppy disk dr8ve floppy disk dri8ve floppy disk dr8ive floppy disk dr*ve floppy disk dri*ve floppy disk dr*ive floppy disk dr9ve floppy disk dri9ve floppy disk dr9ive floppy disk druve floppy disk driuve floppy disk druive floppy disk drove floppy disk driove floppy disk droive floppy disk drjve floppy disk drijve floppy disk drjive floppy disk drkve floppy disk drikve floppy disk drkive floppy disk drlve floppy disk drilve floppy disk drlive floppy disk drave floppy disk dreve floppy disk dride floppy disk drivde floppy disk dridve floppy disk drife floppy disk drivfe floppy disk drifve floppy disk drige floppy disk drivge floppy disk drigve floppy disk drice floppy disk drivce floppy disk dricve floppy disk dribe floppy disk drivbe floppy disk dribve floppy disk dri e floppy disk driv e floppy disk dri ve floppy disk driv3 floppy disk drive3 floppy disk driv3e floppy disk driv# floppy disk drive# floppy disk driv#e floppy disk driv4 floppy disk drive4 floppy disk driv4e floppy disk drivw floppy disk drivew floppy disk drivwe floppy disk drivr floppy disk driver floppy disk drivre floppy disk drivs floppy disk drives floppy disk drivse floppy disk drivd floppy disk drived floppy disk drivde floppy disk drivf floppy disk drivef floppy disk drivfe floppy disk driva floppy disk drivi floppy disk drivo floppy disk drivu Definition commonly spelled as: Defanition or Defenition, Synonym as: Synonim, Sinonym or Sinonim, Thesaurus as: Thesorus or Thesauris, Dictionary as: Dictionery or Dictionry and Define is usually not misspelled. 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