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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“I can’t think of a single supposedly Black issue that hasn’t wasted the original Black target group and then spread like the measles to outlying white experience.”
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