Abstract: A rack unit for stacking storage medium disks such as compact disks (CDs) in a stacked cylindrical arrangement attached by arms to a vertical post attached to an enlarged base support. The cylindrical arrangement is oriented to be off-center in relation to the base support. The unit includes substantially planar and flat narrow support arms for holding and supporting the disks, so that the disks can be closely stacked to one another. The arms can include flat and planar clip ends thicker than the rest of the arms for snapably attaching about vertical post, where a step edge allows for an exterior edge of the disk to abut against it. The narrow support ends can include a wider substantially flat and planar support surface having an upwardly protruding and flexible hub portion which can snugly fit within the through-holes of the disks.