FDDE
A FDDE for Floppy Disk Drive Emulator (also called sometimes Floppy Disk Hardware Emulator) is a really nice device which can replace a standard 3.5" FDD. It tricks an old device in which it is hooked into thinking it communicates with a regular FDD. Basically it's a device that takes modern medium like an USB-based mass storage or a SD card instead of a 3.5" floppy disk, and convert them into the right data signals to communicate with a host via the FDD bus. See it as a Link To The Past anchored into the present.