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Bane Vasić<br />

University of Arizona<br />

Miroslav Despotović<br />

University of Novi Sad<br />

Pervez M. Aziz<br />

Agere Systems<br />

Necip Sayiner<br />

Agere Systems<br />

Ara Patapoutian<br />

Maytor<br />

Brian Marcus<br />

IBM<br />

Emina<br />

S<br />

oljanin<br />

Lucent Technologies<br />

∨<br />

Vojin<br />

S<br />

enk<br />

University of Novisad<br />

Mario Blaum<br />

IBM<br />

© 2002 by CRC Press LLC<br />

∨<br />

34<br />

A Read Channel for<br />

Magnetic Recording<br />

34.1 Recording Physics and Organization<br />

of Data on a Disk<br />

Magnetic Recording Basics • Physical Organization of Data<br />

on Disk • Logical Organization of Data on a<br />

Disk • Increasing Recording Density • Physical Limits on<br />

Recording Density • The Future<br />

34.2 Read Channel Architecture<br />

Analog Front End • Precompensation • Partial-Response<br />

Signaling with Maximum Likelihood Sequence<br />

Estimation • Adaptive Equalization • Viterbi<br />

Detection • Timing Recovery • Read Channel Servo<br />

Detection • Postprocessor • Modulation Coding • Error<br />

Control Coding • The Effect of Thermal Asperites • Error<br />

Performance Measures<br />

34.3 Adaptive Equalization and Timing Recovery<br />

Adaptive Equalization • Adaptive Timing Recovery<br />

34.4 Head Position Sensing in Disk Drives<br />

Introduction • Servo Writers • The Digital Field • The<br />

Burst Field<br />

34.5 Modulation Codes for Storage Systems<br />

Introduction • Constrained Systems and<br />

Codes • Constraints for ISI Channels • Channels with<br />

Colored Noise and Intertrack Interference • An<br />

Example • Future Directions<br />

34.6 Data Detection<br />

Introduction • Partial-Response Equalization • Decision<br />

Feedback Equalization • Detection in a Trellis • Advanced<br />

Algorithms and Algorithms under Investigation<br />

34.7 An Introduction to Error-Correcting Codes<br />

Introduction • Linear Codes • Syndrome Decoding,<br />

Hamming Codes, and Capacity of the Channel • Codes over<br />

Bytes and Finite Fields • Cyclic Codes • Reed Solomon<br />

Codes • Decoding of RS Codes: The Key<br />

Equation • Decoding RS Codes with Euclid’s<br />

Algorithm • Applications: Burst and Random Error<br />

Correction<br />

A steady increase in recording densities and data rates of magnetic hard drives during last 15 years are<br />

mostly due to advances in recording materials, read/write heads, and mechanical designs. The role of<br />

signal processing and coding has been to make the best use of the capacity and speed potentials offered<br />

by these advances. As the recording technology matures, the read channel is becoming more and more

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