A server blade insertable into a chassis of a blade server system includes a main circuit board coupled to the chassis upon insertion, a plurality of connectors residing on the main circuit board, a plurality of grouped hard disk drives, and a plurality of computer modules, each insertable into a corresponding one of the connectors. Each of the grouped hard disk drives couples to one or more of the computer modules. Each of the grouped hard disk drives includes a first hard disk drive exposed proximate to a front side of the chassis, and a second hard disk drive positioned between the first hard disk drive and a back side of the chassis. A subset of the grouped hard disk drives includes a first grouped hard disk drive and a second grouped hard disk drive stacked on the first grouped hard disk drive.