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・ Double Dealing (1932 film)
・ Double Dealing Character
・ Double decker
・ Double Decker (chocolate bar)
・ Double Decker (film)
・ Double Decker Express
・ Double decker taco
・ Double Dee
・ Double Dee and Steinski
・ Double default
・ Double deficit
・ Double deficit (education)
・ Double degree
・ Double Demotivation
・ Double Denim Records
Double density
・ Double Deuce
・ Double Dexter
・ Double Dhamaal
・ Double Di Trouble
・ Double diamond
・ Double Diamond (album)
・ Double Diamond (cigar)
・ Double Diamond Burton Pale Ale
・ Double Diamond Dude Ranch Dining Hall
・ Double Diamond International
・ Double diffusive convection
・ Double digging
・ Double digital option
・ Double diode triode


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Double density : ウィキペディア英語版
Double density

Double density, often shortened DD, is a capacity designation on magnetic storage, usually floppy disks. It describes the use of an encoding (or modulation) of information, which can encode on average twice as many bits per time unit compared to single density. This is achieved by using MFM instead of FM.
Floppy disk drives have been using this method since 1978 with the introduction of the 360 KiB (MS-DOS FAT size) drives.
The early hard disks also used this encoding, but was replaced by the more efficient RLL method.


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Double density」の詳細全文を読む



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