Systems and methods for bypassing lower level caches and enabling direct access to higher level caches in order to provide fixed data latency and increased amounts of immediately accessible storage. A signal, formatted as Internet protocol data, is received from a device. In each mounting portion, a cartridge is inclined downwardly from an upstream to a downstream side with respect to a mounting direction and a phantom plane passing through axes of the drums is inclined toward a downstream side with respect to the mounting direction from a bottom part to a top part of the phantom plane. The sleeve has sloping trenches that are less steep and opposing the first trenches, and has recesses connected to the trenches. In a second step, the upper component is inserted into the disc space by sliding its interior surface along the opposed interior surface of the lower component.