Methods and systems are described in which the feedback between a transmitter and collocated receiver is reduced so that the overall feedback loop gain is less than 0 dB. The mapping as well as additional page data can be retained within a persistence layer accessible to the data storage application. For each subquery, plan generation involves the following four distinct steps. The surface of the rotary pillar has helical grooves, each plug a flange toward a corresponding groove in the rotary pillar, and the flange can slide into and along the corresponding helical groove.