1
Edward D Bemis: Concurrent image backup for disk storage system. AT&T Global Information Solutions Company, Hyundai Electronics America, Symbios Logic, Wayne P Bailey, James M Stover, January 23, 1996: US05487160 (115 worldwide citation)

A disk drive within a disk array is utilized to capture the original image of data blocks that are updated, i.e., written over, through normal array processes during backup operations. The method captures original data images in a manner that allows the array to be restored to the state that existed ...


2
James R Jahelka, Edward D Bemis: Control system. NCR Corporation, J T Cavender, Albert L Sessler Jr, June 19, 1979: US04158800 (15 worldwide citation)

Improved drive logic for a stepper motor is provided using a closed loop feedback system which includes a coded disk driven by the motor and decoding means to derive signals from said disk. The motor is operated at varying speeds in accordance with variations in the lead angle between the energized ...