Secondary memory systems that i've used over the years include (in vague and convoluted order of capacity):
- 2kB NVRAM card-slightly larger than a CF card-for a little Casio pocket computer
- 140 and 180kB per side 5¼" flip-floppies
- 360 and 1200kB properly double-sided 5¼" floppies
- 400, 720, 800, and 1440kB [which is, by no sane means 1.44MB] 90mm (3½")
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