Abstract: Access can be optimized to data strings hierarchically organized on a single disk drive where the data strings are address map defined and recorded in bands of contiguous tracks on a frequency usage basis. The bands are arranged such that each of the most frequently used strings are out-of-phase recorded several times on a counterpart track where the band is located toward the outer disk diameter. The least frequently used strings and sequential data strings are stored elsewhere on the same or other surfaces. A group of three or more bands provides for a more refined partitioning of the data strings on a frequency of usage or a recency of usage basis. The read/write transducer has its idle position over the outer diameter.