2.1 HDD Servo Systems2.1.1 Inside an HDD2.1.2 Generation of Servo Position Signal2.2 TMR Budget Design2.3 Modeling of HDD2.3.1 Introduction2.3.2 Plant Components2.3.3 Modeling of Mechanical Dynamics2.4 Modeling of Disturbances and PES2.4.1 Disturbances and PES2.4.2 Decomposition of Steady-State PES2.4.2.1 RRO and NRRO2.4.2.2 Frequency Spectrum of NRRO2.4.2.3 Decomposition of NRRO2.4.3 Decomposition of Transient ResponseBibliography