The present invention provides a composite vibrator that can maintain high sensitivity even when miniaturized. The connector comprises a base member, a contact and an actuator. This process is capable of stably preparing a powdery alkyl sulfate without deteriorating the quality of aqueous slurry of an alkyl sulfate and powder obtainable from the aqueous slurry. However, if the amplitude is below the pre-determined amplitude for the disk drive, a second speed negotiation process is forced using a low frequency signal from the host and calculations are performed to determine appropriate transmit amplitudes for the interconnect.