A disk-controller that is within a disk memory system initiates the auto-transfer of host-requested-data from cache memory without the intervention of a microprocessor that is within the disk memory system. To improve the quality of controlling of the friction clutch and to avoid the application of undesirable torque, it is proposed to compensate a hysteresis that arises between, the target torque and the friction torque actually transmitted by the friction clutch along the actuation path by correcting a setpoint for controlling the clutch actuator with a corrective quantity. In a first switch position, the switching device connects a first connection to a second connection and, in a second switch position, connects the first connection to a third connection, and the three connections are left unconnected in a third switch position.