Schedule for this course

This course is intended for those who need a broad and in-depth understanding of disk drive servo systems. While no previous knowledge of control systems theory is required, participants will learn how disk drive servo systems are designed and tuned. Control systems fundamentals are introduced as the track following and seeking systems are covered. The course explores in depth the parameters that determine performance and stability, as well as the many practical details which affect disk drive servo system designs. Actual servo architectures used in today's drives are covered in detail. Advanced topics such as modern digital control systems, state estimators, multirate control, and the impact of MR heads are also presented. The course finishes with a discussion of servo technologies required to support the next generation of high TPI disk drives.

Participants should have taken the Disk Drive Technology course or have equivalent industry experience.
 

Servo Mission Track Misregistration (TMR) 747 Curves Erase Bands Position Transducers Embedded Servo Patterns Gray Encoded Cylinder Numbers Phase and Pulse Encoding Quadrature Servo Bursts Decoding Embedded Servo Peak vs. Area Detection Demodulation and Signal Timing Servo Track Writing Actuators and Drivers VCM Structures Torque Constant Back-EMF Voltage vs. Current Drivers On-Track Control Position Control System Servo Loop Modeling Frequency Domain Analysis Bode Plots Loop Stability Servo Compensator Design Phase and Gain Margin Servo Loop Tuning Dealing with Real Mechanics RRO, NRO, and CRRO Shock and Vibration Resonances Biases, Offsets, and Non-Linearities Error Analysis Design Tradeoffs

Digitally Sampled Servos Typical Digital Servo System Nyquist and Sample Rate Zero Order Holds Digital Compensator Design Transport Delay Phase Budget Seeking Bang-Bang Seeks Trajectories Feed-Forward Back-EMF Effects Settling Bias and Offset Predication Short Seek Strategies Servos and MR Heads Write Wide - Read Narrow Microjog Non-Linearities Baseline Shift Advanced Control State Estimators MultiRate Control Bias Estimators Future Trends Bearing Non-Linearities Multistage Actuators NRRO Issues Beyond 30,000 TPI

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