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Disk density
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== 8-inch media <span class="anchor" id="SD"></span><span class="anchor" id="DD"></span>== ''Single density'' (SD or 1D) describes the first generation of floppy disks that use an iron oxide coating. Floppy drives utilize 300-oersted write heads, [[Differential Manchester encoding|FM encoding]], and a track width of {{convert|0.330|mm|abbr=on}} for a density of 48 tracks-per-inch (tpi) and 5,876 bits-per-inch (bpi). ''Double density'' (DD or 2D) doubles capacity over SD by replacing FM encoding with an improved [[line code]], such as [[modified frequency modulation]] (MFM), [[modified modified frequency modulation]] (MΒ²FM), FM/MFM or [[group coded recording]] (GCR).
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