The best know floppy disk drive for the {Commodore 64}.The 1541 was a single sided 160 Kb drive but converting to flippy disks would give another 160 Kb.The disk drive used Group Code Recording and contained a 6502 processor as a disk controller.Some people wrote code for it to vibrate the head at different frequencies to play tunes.The transfer rate was about 300 bytes per second.The 1541 used a bit-serial version of the IEEE 488 parallel protocol.Some third-party speed-ups could transfer about 4 kilobytes per second over the interface, and some "fast loaders" managed up to 10 kbps.The Commodore 1570 was an upgraded 1541 for use with the Commodore 128.(2000-03-07)