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> HD 3.5" floppy

It's slightly amusing to me that floppy disks were once called "HD", even though the abbreviation stood for high density rather than high definition.

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Before those, you had double density "DD" disks -- and extended density "ED" disks after that. With the sleeve encased floppies you could even throw in single-sided and double-sided variants. Growing up, we had a lot of 1200KB 5-1/4 disks. IIRC, they were enough cheaper than 1440KB 3-1/2 disks for close to the same storage.

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