Title :
Track follow servo optimization for disk drives
Author :
Hingwe, Pushkar ; Gupta, Akhil
Author_Institution :
Hitachi Global Storage Technol., San Jose, CA, USA
Abstract :
The track misregistration (TMR) requirement for hard disk drives (HDDs) has become more demanding to keep pace with increase in recording density. It is no longer sufficient to make design decisions for actuator, servo, power amplifier and formatting efficiencies in isolation. Inclusion of these factors into servo performance criteria makes the servo optimization non-convex and non-linear. However, the structure of the track following servo controller for HDDs is usually simple for computational efficiency. This simplicity makes optimization in the face of non-linear performance criteria numerically tractable. We demonstrate the effectiveness of random neighborhood search algorithms in achieving servo design optimization. We emphasize optimization techniques that are useful with analytical models (available commonly during the research/advanced development stage) as well as numerical data (available during product development and manufacturing).
Keywords :
concave programming; disc drives; hard discs; nonlinear programming; position control; search problems; servomechanisms; HDD; hard disk drives; nonconvex servo optimisation; nonlinear servo optimisation; random neighborhood search algorithms; recording density; servo design optimization; track following servo controller; track misregistration; Actuators; Analytical models; Computational efficiency; Design optimization; Disk drives; Disk recording; Hard disks; Power amplifiers; Product development; Servomechanisms;
Conference_Titel :
Control Applications, 2004. Proceedings of the 2004 IEEE International Conference on
Print_ISBN :
0-7803-8633-7
DOI :
10.1109/CCA.2004.1387268