the real 5.25 one of course.
when i studied IT i had the forerunners of word, excell and dbase all on one floppy
we first had to load the program before we could load our documents.
after i flunked out of college the first pc came on the market. and a bit later the AT, what a power that one had!
in highschool it was zx 81 and later the zx spextrum with 1k memory! storing your stuff on cassette tapes