POSITIONING PERFORMANCE IMPROVEMENT OF A SERVOMECHANISM OF HARD DISK DRIVE IN A COMPUTER

This paper has presented positioning performance improvement of a servomechanism of hard disk drive (HDD) in a computer. It is desired to improve the transient response performance of servo positioning system of an HDD in computer. In order to do this, the mathematic equations representing the dynamics of the servomechanism were obtained and later transformed into transfer function representing the plant. A proportional integral derivative (PID) compenstaor was designed so as to meet the performance specifications of the HDD, PID tuning was used as the design method and a robust response time tuning method was employed subject to automatic (balance performance and robustness) design mode. The compensator is integrated with dynamic of an HDD to form a control loop. The simulation results obtained indicated that the designed controller largely improved the positioning performance of the system as well as its stability. This ensured improved track seeking and track following.