* Silver Stripes ponders the prior art thing
what filesystem did CP/M use?
for those who dont know their history.... CP/M was -very- 'dos' like (tho much more powerfull considering the timeframe) a company called seattle computer* (*correct me here on the exact name) created 'QDOS' it stood for "quick and dirty operating system" and was a loosely based clone of CP/M .... gates bought QDOS turned it into MSDOS (version 1 if i remember) and licenced it (non exclusively) to IBM for their new "PC" .....
doesnt take too much of a leap of logic from there...