A device for communication between a portable computer system including a display screen and avionic equipment items comprises shielded walls forming at least a partial Faraday cage. The relative magnitude of the currents through the two inductors can be dynamically varied, which changes the effective inductance. An auto-refresh counter and row address block are used to generate a section address and a row address of memory cells to refresh. The network switch system includes a first virtualization layer that maintains first tier objects including information reflecting a relationship between the physical block addresses and one or more logical partitions of virtual volume data. The consumable material is identified by a machine-readable identification tag, which is read off by a reading device. When the handle is rotated, the fan module is moved relatively to the first wedging portion for entering or exiting the chassis.