Just my two cents: your question has nothing directly to do with gaming, or more relevantly, hardware directly related to playing video games. There is nothing about trying to use a 5 1/4" floppy disk that is directly related to playing games except for your intent.
In general, if we want any questions at all in the hardware and backwards-compatibility tags, we would want them to be specific to gaming hardware because then the question is directly related to the site topic and is the kind of knowledge one might expect a gaming expert to have.