![]() Marketed Capacity is the capacity, typically unformatted, by the original media OEM vendor or in the case of IBM media, the first OEM thereafter. For 5 1⁄ 4- and 3 1⁄ 2-inch capacities quoted are from subsystem or system vendor statements.Spare, hidden and otherwise reserved sectors are included in this number. ![]() For 8-inch see Table of 8-inch floppy formats IBM 8-inch formats.Historical sequence of floppy disk formats Disk formatġ13.75 KB (256 byte sectors, 13 sectors/track, 35 tracks)ĩ0 KB (128 byte sectors, 18 sectors/track, 40 tracks)ġ40 KB (256 byte sectors, 16 sectors/track, 35 tracks)ġ27 KB (128 byte sectors, 26 sectors/track, 40 tracks)ħ20 KB (400 SS, 800 DS on Macintosh, 880 DS on Amiga)Ībbreviations: SD = Single Density DD = Double Density QD = Quad Density HD = High Density ED = Extended Density LS = Laser Servo HiFD = High capacity Floppy Disk SS = Single Sided DS = Double Sidedįormatted Storage Capacity is total size of all sectors on the disk: Formatted capacities are generally set in terms of kilobytes and megabytes. The ANSI specification of 3 1⁄ 2-inch disks is entitled in part "90 mm (3.5 in)" though 90 mm is closer to 3.54 inches. Floppy disk size is often referred to in inches, even in countries using metric and though the size is defined in metric.
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