Self-centering disk having an eccentric elliptical-shaped center locating hole

摘要

A magnetic disk member for a memory disk file usable in a data processing system includes an eccentric multi-lobed triangular center locating hole to facilitate concentric mounting of the locating hole centerlines in a multiple disk pack memory. The disks are centered in a disk pack by placing onto a drive hub having ribs to match the lobes of the locating holes.