When data is stored for a certain retention period, well prior to the expiration date, the storage controller starts encryption of data on a certain volume while ensuring data access from hosts, and repeats read and write of the data predefined number of times while also ensuring data access from hosts. One implementation includes magnetic jumper cables, which include magnetic couplers and elongate, insulated, electrically-isolated electric conductors. When the processing detector circuit detects a change in the state of the wiring lines, the integrated circuit is reset. The sidewalls include a self-assembly material. Prior to the P+ sourcedrain implant, a masked second spacer etch is performed.