Patent ID: 6735039
Filing Date: 2004-05-11
Classification: G11B

Abstract:
A servopositioning system for a linear data recording system, comprising in combination:a) a linear data recording medium, upon which is recorded a signal in the form of an amplitude-based servo format that comprises first, second, third and fourth sections having respective amplitudes A1, B1, A2 and B2, respective first through fourth periods T(A1), T(B1), T(A2) and T(B2), and respective first and second intervals I1 and I2, all satisfying A1&gE;B1 and A2&gE;B2 T(A1)+T(B1)=T(A2)+T(B2) I1=T(A1)+T(B1) I2=T(A2)+T(B2) b) circuitry, responsive to signal amplitude, for producing a position error signal (PES) satisfying PESi&Tilde;BiAi;andc) circuitry, responsive to signal duration, for decoding information encoded such that the signals over durations I1 and I2 represent first and second states representative of information.