The first 5.25-inch floppy disk drive, the Shugart SA400, introduced in August 1976, used the AMP Mate-n-Lok connector part number 350211-1. This connector became the standard for 5.25-inch format peripherals such as hard drives and was used until introduction of SATA drives. In 1983, Molex introduced the 8981 connector under the trademark Disk Drive Power Connection System, which was fully compatible with the AMP Mate-n-Lok connector. The Molex 8981 series was only produced in a 4 position option, unlike the Mate-n-Lok family which includes many other contact arrangements.