In a computer system having hierarchically-arranged data storage apparatuses, a management computer provides information required for performing operation on the data storage apparatuses. The split body allows exposure of internal components for access, service andor maintenance. The rotatable cartridge contains the flexible tubing. The user interface is illustratively embodied in an interactive program guide. The product is essentially triangular in shape and the fastening member is applied to the liquid-permeable surface layer only in the rear section of the product. The second portion of the gate layer is disposed on sidewalls of a fin.