Abstract: A computer case having at least one 31/2" drive housing which can be removably mounted within the case. Each 31/2" drive housing has one or more (typically, two) channels. A 31/2" drive is slidably insertable within each channel. A plurality (normally, as many as four) 31/2 drive housings are removably mountable at different locations within the case via quick release connectors provided at different locations within the case. A "U" shaped mounting bracket captures each 31/2" drive. The bracket has two opposed legs, with one or more inwardly projecting pins on each leg. The pins slide into apertures located in the opposed sides of industry standard 31/2" drives. A one-piece backplane with quick release connectors is easily removed and replaced by adjacent a cutout provided in an outer wall of the case. A series of cutouts are provided in the backplane. Each cutout is positioned to align with a connector on a motherboard mounted in the case, when the backplane is in place adjacent the case outer wall cutout.