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Group coded recording
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=== {{anchor|4-5}}Sharp ===<!-- used in redirects --> In 1986, [[Sharp Corporation|Sharp]] introduced a [[flippy disk|turnable]] 2.5-inch pocket disk drive solution (drives: [[Sharp CE-1600F|CE-1600F]], [[Sharp CE-140F|CE-140F]]; internally based on the FDU-250 chassis; media: [[Sharp CE-1650F|CE-1650F]]) for their series of [[pocket computer]]s with a formatted capacity of {{val|62464}} bytes per side (2Γ 64 kB nominal, 16 tracks, 8 sectors/track, 512 bytes per sector, [[48 tpi]], 250 kbit/s, 270 rpm) with GCR (4/5) recording.<ref name="Sharp_1986_CE1600F" /><ref name="Sharp_1986_CE140F" />
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