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Media Noise has become the dominant noise source in modern disk drive channels and one of the key parameters in determining areal density. This course will take you on a complete tour of media noise - from its origin in the micro-magnetics of the disk, through the influences of pulse shape and channel characteristics, to its impact on error rates. The class focuses on providing simple, intuitive models for media noise and its characterization so that advanced math skills are not required. Frequent use is made of examples from real-world applications and computer simulations.

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

Introduction What is Media Noise? Why is it More Important Now? Bit Size Trends Magnetics of Media Noise Media Structure Ferro-Magnetic Materials Domains and Gains Domain Walls Magneto-Static Energy Demag Field Transition Noise: Zig-Zags Micro-Magnetic Model Measuring Media Noise Integrated Noise Power Partial Erasure Supra-Linear Boundary Amplitude Variance

Synchronous Channels & Noise Gaussian Noise Z-Score Complimentary Error Function Distribution Analysis Pattern Effects Error Rates Micro-Track Media Noise Model Isolated Pulse Media Noise Complex Patterns Linear Super-Position Slope Approximation Noise and Error Rate Budget Linear Distortion Model Analysis of Variance (ANOVA) Separating Media, Pattern, and     Electronics Effects Conclusion How Bad is Your Media Noise? What Can be Done About It?

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