A storage subsystem that has detected the necessity of the data relocation determines whether the data relocation is possible or not from one storage unit to another within the particular storage subsystem. A channel protection layer overlies the gate to define a channel area in the semiconducting metal oxide. A pair of switches may be mounted in separate locations to detect the position of a control arm used to rotate the trunnion arm. Each of the electrical contacts includes a contact heel and a contact beam that extends from the corresponding contact heel and at least partially away from the first side.