Other disk and drive types (Was: Hard-sector discs -- how many

MMFM? Amiga (MFM, without IBM style sector headers) Tandy PDD? (3.5" ""hard sector"" (index off of spindle?)) 3" (Amdek, Amstrad, etc.) 3.25" (Dysan) are hard to distinguish from 5.25" Some formats, such as Intertec Superbrain had the data bits inverted relative to the header bits Some, such as TRS80, got weird with their Data Address Marks 2.5" and 2.9" There were some with "conventional structures", and some with single track spirals Amlyn which preceded IBM's 1.2M is 5 1.2M disks in a cartridge with a disk changer mechanism Kodak, Drivetec 2.8M "ED" "vertical recording" 3.5" 360 RPM, 1000K bits per second "Floptical" (20M 3.5", SCSI interface) LS120? (IDE interface) Iomega products (only readable by Iomega drives until the Click of death) Exatron Stringy Floppy Tape drives that used an SA400 interface I saw a "memory stick"? reader that was shaped like a 3.5" floppy, and inserted into the floppy drive . . . and then, there are some obscure ones, and even some unusual ones.