Patent ID: 8587892

Claim:
Method for operating a storage device with a tape (TP) and a head (HU) wherein the head (HU) comprises a first read element (RE 1 ) and a second read element (RE 2 ), wherein each read element (RE 1 , RE 2 ) is operable to detect predetermined servo patterns of a particular predetermined servo band (SP) being stored on the tape (TP) along a longitudinal expansion of the tape (TP), wherein the first and the second read element (RE 1 , RE 2 ) are arranged in such a way, that the tape (TP) at first passes one of both read elements (RE 1 , RE 2 ) and subsequently passes the other of both read elements (RE 1 , RE 2 ) when the tape (TP) moves in a predetermined longitudinal direction (X), wherein a tape transport direction (TPDIR) of the tape (TP) along the longitudinal direction (X) is determined, the first read element (RE 1 ) is selected dependent on the determined tape transport direction (TPDIR), when the determined tape transport direction (TPDIR) represents a direction where the tape (TP) at first passes the first read element (RE 1 ) and subsequently the second read element (RE 2 ), and otherwise the second read element (RE 2 ) is selected, a position error signal (PES 1 ) is determined dependent on the selected read element wherein the position error signal (PES 1 ) represents a lateral distance between a lateral position of the selected read element and a predetermined lateral reference position (r y ) on the particular servo band (SP), an estimated lateral track position (d est ) representing the lateral reference position (r y ) on the servo band (SP) with respect to a predetermined lateral reference point (REF) at a longitudinal position (x1) of the selected read element is estimated dependent on the determined position error signal (PES 1 ), with respect to the predetermined reference point (REF) another estimated lateral track position (d* est ) at a longitudinal position (x2) of the non-selected read element is estimated in such a way that the other estimated lateral track position (d* est ) becomes a time-delayed representation of the estimated lateral track position (d est ), a control signal (u) is determined dependent on the other estimated lateral track position (d* est ), wherein a lateral head position (y) of the head (HU) is controlled via the control signal (u).