Simeon Furrer, Dirk Dahlhaus
IEEE Trans. Inf. Theory
Aggressive track-density scaling is projected to be a key means of increasing the areal bit density and cartridge capacity in future magnetic tape recording systems. To achieve very high track densities, nanometer-scale accuracy is needed in positioning the tape head over the data tracks during read and write operations. State-of-the-art tape systems employ timing-based-servo (TBS) patterns [1] to estimate the head position by measuring the relative timing between sequential bursts of servo stripes. In this work, we evaluate a set of experimental TBS patterns servo-formatted on a perpendicular barium-ferrite (BaFe) tape medium and quantify the achievable resolution in the lateral position estimate. We compare closed-loop position error measurements with resolution estimates based on a) the noise floor of the power spectral density of the lateral tape motion measured from the servo pattern during closed-loop track-following, and b) an analytical lower bound which depends on the servo readback signal shape and the signal-to-noise ratio.
Simeon Furrer, Dirk Dahlhaus
IEEE Trans. Inf. Theory
Simeon Furrer, Dirk Dahlhaus
ISIT 2005
Giovanni Cherubini, Roy D. Cideciyan, et al.
GLOBECOM 2009
Simeon Furrer, Wolfgang Schott, et al.
TridentCom 2006