@Mycroft It's like a really big SD card.
A 3½" floppy is the physical size of just over 18 standard SD cards and, if Amiga-formatted, holds 1.76 megabytes of data. A 4GB SD card, largest size made, stores about 2383 times that floppy.
To be fair, the smallest SD card held only one megabyte, so... SD cards have come a long way.