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I see on floppy some "standards" called SSSD, or DSSD. Some of them are known for me some other not.

Standard Definition
DMF #?
DSDD #Double Sided Double Density
DSED #Double Sided ?
DSHD #Double Side High density?
DSSD #Double Sided Single Density
SSSD #Single Sided Single Density

What does it mean DMF? And DSED/HD?

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    Old 5.25" floppy disks had full double sided capacity of 360KB . Newer 3.5 inch disks had 720KB and 1440KB double density. Today (95%+) you can only use 3.5 inch floppies with a USB drive. Works up to Windows 11 Pro today
    – John
    Dec 1, 2022 at 14:42
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    IIRC - and I'm not sure I do - DSHD (yes, "high density") was a special IBM format that squeezed ~1.8MB onto a 3.5" floppy. It was never widely supported. Dec 1, 2022 at 14:56

2 Answers 2

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DMF is a Distribution Media Format Floppy Disk, it's 3½-inch having 1680 KB compared to other disks having 1440 KB. Needed a special device to copy them hence making them somewhat protected.

DSED — Double-Sided Extended-Density

Densities vary from single (SD), double (DD), high density (HD), than extended (ED) and finally Triple density (TD).

https://en.wikipedia.org/wiki/List_of_floppy_disk_formats

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Distribution Media Format (DMF) is a format for floppy disks that Microsoft used to distribute software. Source.

In 1988, Y-E Data introduced a drive for 2.88 MB Double-Sided Extended-Density (DSED) diskettes which was used by IBM in its top-of-the-line PS/2 and some RS/6000 models and in the second-generation NeXTcube and NeXTstation. Source.

The term DS/HD means double sided high density.Sometimes called MF2-HD. Source.

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