I recently acquired a floppy drive emulator. I can't say I have too much free time to play with such useless things, but I had the strange desire of getting one of these beasts.
I did have trouble setting up some virtual images -- as there are not any predefined formats in the tools provided.
I ended up with this table, which I keep here for reference:
| Drive | DS/DD | DS/HD | DS/ED | SS/DD | SS/DD | DS/DD | DS/DD | DS/HD |
| Form Factor | 3.5" | 3.5" | 3.5" | 5.25" | 5.25" | 5.25" | 5.25" | 5.25" |
| Track Density | low | high | high | low | low | low | low | high |
| Capacity (kBytes) | 720 | 1,440 | 2,880 | 160 | 180 | 320 | 360 | 1,200 |
| Cylinders | 80 | 80 | 80 | 40 | 40 | 40 | 40 | 80 |
| Heads | 2 | 2 | 2 | 1 | 1 | 2 | 2 | 2 |
| Sectors | 9 | 18 | 36 | 8 | 9 | 8 | 9 | 15 |
| Start Sector | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Sector Size (bytes) | 512 | 512 | 512 | 512 | 512 | 512 | 512 | 512 |
| Data Rate (kbps) | 250 | 500 | 1,000 | 300 | 300 | 300 | 300 | 500 |
| GAP3 (access/format) | 27/80 | 27/108 | 27/83 | 42/80 | 42/80 | 42/80 | 42/80 | 27/84 |
| SR/HUT | 0xdf | 0xdf | 0xdf | 0xdf | 0xdf | 0xdf | 0xdf | 0xdf |
| Interleave | 1:1 | 1:1 | 1:1 | 1:1 | 1:1 | 1:1 | 1:1 | 1:1 |
| Head Skew | 0 | 0 | 0 | -- | -- | 0 | 0 | 0 |
| Cylinder Skew | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Encoding | MFM | MFM | MFM | MFM | MFM | MFM | MFM | MFM |