Robust control applications to hard disk drives

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Magnetic hard disk drives are widespread and indispensable storage media nowadays. The storage media has been widely used in various applications ranging from lap-top computers, mobile audio players, car navigation, to security and communication systems. A current goal of the magnetic disk drive industry is to break the 1 tera-bit per square inch storage density barrier, which imposes a stringent performance specification for the conventional single-stage disk drive servo. To meet the challenge, several dual-stage actuation schemes have been proposed. All these proposals, however, lead to a multivariable servo system for which conventional scalar design techniques become inadequate to fully exploit the potential of that system. Thus, it is imperative to come up with appropriate design methodologies for the dual-stage multi-sensing system, in which optimal, robust performance is pursued in an explicit and systematic way. This proposal is a response to this need.