A storage system comprising: a cartridge, said cartridge including an upright having mounted to one side a plurality of guide blocks; a plurality of first drawer information means for providing information on at least one of position and movement of respective drawers; and a plurality of latch mechanisms, said system further comprising a plurality of drawers, each said drawer including: guide block engaging means extending in a depth direction of the drawer and mounting a first side of the drawer adjacent a respective guide block; second drawer information means disposed adjacent the first drawer information means; and at least one stop on the first side of the drawer for engaging with a said latch mechanism, wherein the latch mechanisms are electronically controllable, whereby access to the drawers can be controlled.