🚀 go-pugleaf

Thanks to all those that sent email anwering my questions about floppies.
Here is a summary:

5 1/4 inch
----------

     DS DD, 40 tracks, 9 sectors/track,  360K formatted
     DS HD, 80 tracks,                ,  1.2M formatted, 1.4(?) raw

- Diskette case is identical for the DD and HD diskettes.  There is no
  hole or slot in the case to distinguish between the two densities.

- Coercivity of HD diskettes is about twice that of DD diskettes.
  So a DD drive cannot make enough signal impression on an HD diskette.

- The HD track 0 is about .100" closer to the hub than the DD track 0.
  Many HD disks don't have acceptable media where track 0 of a DD diskette
  would be.


3 1/2 inch
----------

     DS DD 80 tracks,  9 sectors/track,  720K formatted, 1M raw
     DS HD 80 tracks, 18 sectors/track, 1.44M formatted, 2M raw
     DS ED                              2.88M formatted, 4M raw,
                                        requires DOS 5.0 and above.

- DD and HD diskettes have roughly the same coercivities.

- HD diskettes have a square hole in the plastic casing directly opposite
  from the write-protect hole.  DD diskettes do not.


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