Loop materials are provided for touch fastening. The stator has a housing with an open end, an end cap fixed to the open end of the housing, a stator core fixed to an inner surface of the housing, and windings wound on the stator core. The front and rear signals are modified in pairs by separating an ambient component of each pair of signals from a direct component and processing at least some of the components with a head-related transfer function. Methods of securing together a plurality of semiconductor devices include inserting an elongated portion of a fastener through an aperture in a first semiconductor device and an aperture in at least one additional semiconductor device. The apparatus integrates a disk drive, control program, and data file. A method of performing the same is also provided.