The data recording device comprises a two-dimensional array of microdots of nanometric dimensions arranged facing a storage medium. A chair frame has a pair of front legs and a pair of rear legs and a generally horizontal seat frame element that is supported by the front and rear legs. The systems also may include deployment mechanisms, sheeting mechanisms, cleating mechanisms for the sheeting mechanisms, safety releases, line protectors, and kiteboards, among others, for use with variable-andor fixed-line controllers. The individual blocks are transferred to the second subscriber device and removed from the first subscriber device before subsequent blocks of the selected content are transferred.