12" Floppy Disks

[Chuck Guzis]

In this day and age, nothing surprises me.

The question also hinges on the nationality and age of the questioner. 
A common 5.25" floppy is about 13 cm in size.  Perhaps the young teacher 
didn't have his units correct.

People often don't believe me when I tell them that the floppy disc 
actually hails back to the 1950s.  But it does and was not used for 
digital recording.

--Chuck