There is described a method for manipulation, storage, modeling, visualization, and quantification of datasets, which correspond to target strings. A control unit acquires large ring buffer during sequential writing and performs a retry to return adjacent tracks, according to data of a return sector area of the ring buffer when a write error occurs. Additionally, the battery pack has a plurality of sensors, each of which is for monitoring a characteristic of a distinct battery block. At the second end of the cable a 2.