In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

DM,
I think what Chris is pointing out is that the creation of a file and the management of it are not part of the floppy drive.  So you will have to either duplicate the MS-DOS format or create one of your own.  The convience of MS-DOS is the File Allocation Table and this requires quite a bit of software space.  That would be in the BIOS rom, DOS files, and SYS files [these files would have to be on each floppy].

Before MS-DOS, there were dozens.  You might take a look at CPM for publically published information. 
Try to figure out how to format and add a system file first.

The old Dr. Dobb's Journal [of overbyte and orthidontia] presented much of this material.  If you can find a library that has kept those, they are a goldmine.  The new Dr. Dobb's doesn't provide this material and I suspect it has something to do with that era being very combative about intellectual proprety rights  [so the they bought the magazine's name, not the archives].

IMHO, I think that you can learn as much or more with the SDcards.  I have never had a floppy disk not deteriorate in quality.  Ferric Oxide seems to do very poorly in Taiwan with the high heat and humidity.

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