Abstract: A disk device can include a controller configured to transmit first commands in response to second commands from a host, the first commands to assign at least one identification (ID) code to at least one of a plurality of storage areas in a storage device, the second commands including the at least one ID code; wherein the controller transfers data between the host and the storage device using the ID codes.
Abstract: An apparatus can include a read head formed in a semiconductor layer of an air bearing surface, the read head comprising a channel region formed between a source and drain which are doped to a higher conductivity than the channel region; wherein the channel region is configured to generate a charge carrier depletion region in response to a first ferroelectric dipole direction, and to accumulate charge carriers in response to a second ferroelectric dipole direction.