Happy 810: This is upgrade for Atari 810 floppy disk drive, manufactured by Happy Computer. It features increased data transfer speed (52 kbps versus the stock 19.2 kbps). It also has an 18-sector buffer. Early 810 models had issues with speed stability (standard is 288 RPM) and circuit board reliability, which led to the development of third-party improvements such as the Happy 810.