@nikitonsky@mastodon.online There weren't *really* floppy disks since there were in a hard plastic case. The 5" and earlier 8" floppies were truly floppy. It might have made more sense to call then 288 mega sectors (288,000000 * 512 bytes). The 3.5" started at 360kB, then 720kB (double sided). First Mac had 400kB 3.5" and MacPlus first came with 800 kB double sided, and eventually 1.44 high density double sided. A second hole on disk enclosure denoted high density (first was for write protect)