Patent ID: 9171573
Filing Date: 2015-10-27
Classification: G11B

Abstract:
1. A method for operating a tape storage system, the method comprising: simultaneously receiving readback signals from a set of data readers reading from data tracks of a set of adjacent data tracks extending along a longitudinal extension of a tape storage medium wherein each data track of the set has a width, and comprising data sections alternating with servo sections, and each data reader of the set has a width exceeding the width of a data track; detecting in the readback signal of one of the data readers of the set a simultaneous presence of at least two defined waveforms stemming from at least two different servo patterns arranged in servo sections of adjacent data tracks of the set; deriving at least one of lateral position, velocity, gain and timing information from a measure of the energy of the at least two defined waveforms detected in the readback signal of the data reader and applying this information in the operation of the tape storage system; detecting in the readback signal of another one of the data readers of the set a simultaneous presence of at least two defined waveforms stemming from at least two defined servo patterns arranged in servo sections of adjacent data tracks of the set; and deriving at least one of new lateral position, velocity, gain and timing information from a measure of the energy of the two defined waveforms detected in the readback signal of the other data reader and applying this information in the operations of the tape storage system; wherein the at least two different servo patterns comprise, in each data track, a first pseudo noise (PN) sequence and a second, different pseudo noise (PN) sequence adjacent the first PN sequence, such that the second PN sequence of a first data track aligns with and fully overlaps the first PN sequence of a second data track adjacent the first data track, thereby providing the data reader with the at least two defined waveforms from the first PN sequence and the second PN sequence that are superimposed with one another in the readback signal.