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Group coded recording
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=== Micropolis ===<!-- used in redirects --> Offering GCR-compatible diskette drives and [[floppy disk controller]]s (like the 100163-51-8 and 100163-52-6<ref>{{Cite web |url=https://www.micropolis.com/support/floppy-drives/100163 |title=Micropolis 100163 Intelligent Controller |access-date=2022-06-26 |website=Micropolis }})</ref>), [[Micropolis Corporation|Micropolis]] endorsed data encoding with group coded recording<ref name="McClelland_1979_GCR" /> on 5ΒΌ-inch [[100 tpi]] 77-track diskette drives to store twelve 512-byte sectors per track<!-- 462 KiB per side --> since 1977 or 1978.<ref name="Micropolis_1978" /><ref name="Micropolis_1979_DiskMaint" /><ref name="IW_1980_Micropolis" /><ref name="Guzis_2015_Multi" />
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