Various embodiments of a method and apparatus for implementing multiple transaction translators that share a single memory in a serial hub are disclosed. Workload classification is graphically represented to the user by mapping workload signatures of the workloads to a grid. Each bag has a sifting region having a plurality of sifting holes which allow uncontaminated litter to fall onto the remaining bags in the litter box below. If a magnetic reed switch senses the unlocking of the cargo door lock or the opening of the cargo door after the cargo area has been secured, it causes the number on the counter to change.