In their June 1988 paper "A Case for Redundant Arrays of Inexpensive Disks (RAID)", presented at the SIGMOD conference, they argued that the top-performing mainframe disk drives of the time could be beaten on performance by an array of the inexpensive drives that had been developed for the growing personal computer market. Gibson, and Randy Katz at the University of California, Berkeley in 1987. The term "RAID" was invented by David Patterson, Garth A.