Two versions of this unit exist, an internal version and an external version. The external version plugs into the external floppy drive port. It's a combination of hardware and software which claims to be able to copy any normal density disk, particularly NON-DOS disks and disks which have copy protection. The software does not support multitasking, so you cannot work on something else whilst copies are being made. The unit also contains a switch, probably for disabling the device. The manual claims that the unit is designed for the A500 and A1000 although it probably works with most models of Amiga.