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

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