Is a floppy disk drive input or output?

It depends how you define these terms. Technically it is both, since floppy drives can be written to as well as read from. However, the term 'output device' normally refers to a means to provide information to the user, such as a screen, printer or speakers. Since a floppy drive can not be used to output information directly to the user (only to another computer), it could equally be argued that it is an input device.