Single density, often shortened SD, is a capacity designation on magnetic storage, usually floppy disks. It describes the use of an encoding (or modulation) of information using Frequency modulation, also known as biphase mark code.
Early floppy disk drives used this method, but they are now obsolete. It was quickly replaced by double density floppy drives using modified frequency modulation (MFM).
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Famous quotes containing the word single:
“Sheriff, have you ever watched a friend dying before your eyes and not been able to help? That’s the worst of it. Being helpless. It’s particularly tough when you’re a physician and you know what’s wrong with him, and there isn’t a single solitary thing you or anyone else can do.”
—Robert M. Fresco. Jack Arnold. Prof. Gerald Deemer (Leo G. Carroll)