Schedule for this course

This course is a "Lite" treatment of Disk Drive Servo for those who wish a basic introduction to disk drive servo concepts. The intended audience includes the broad spectrum of semi-technical and non-technical members of the disk drive and related industries who wish to have servo terms and concepts "demystified". Assuming no previous knowledge of control systems theory, the course introduces fundamentals such as Track Mis-Registration (TMR), servo patterns, and Voice Coil Motors (VCMs). Building on this foundation, servo loops, bode plots, and servo compensator design are introduced at a very basic level with minimal math. The course teaches how the servo systems works together with the disk drive mechanical system to achieve desired track following performance. Briefly highlighted are digitally sampled servo systems and MR Head servo issues. The course concludes with a review of the existing challenges faced in the quest for ever higher TPIs. Not included in this course are the more technical topics such as: 747 measurements, detailed analysis and design of servo loop compensators, digitally sampled control systems (in-depth), seek systems, and modern control methods. Those wishing to cover these subjects should consider our 2-dayDisk Drive Servo course.
 

Servo Mission Track Misregistration (TMR) Position Transducer Systems Embedded Servo Patterns Gray Encoded Cylinder Numbers Phase Encoding Quadrature Servo Bursts Decoding Embedded Servo Peak vs. Area Detection Demodulation and Signal Timing Servo Track Writing Actuators and Drivers Voice Coil Motors (VCM) Torque Constant VCM Driver Circuit On-Track Servo Loop Servo Loop Block Diagram Bode Plots Loop Stability Basic Compensation Methods Phase Margin Gain Margin

Dealing with Real Mechanics Repeatable Runout (RRO) Non-Repeatable Runout (NRRO) Shock and Vibration Resonances Biases and Offsets Design Trade-Offs Modern Servo Highlights Digital Servo Description Sampled Servo Issues Impact of MR Heads on Servo Future Trends Disturbances and Errors Dual Stage Actuators

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