Variety of the usage in Hard Disk Drives relies on the high speed, positioning system precision and reliability of their control mechanisms. Vibration is one of the most important concerns in the control mechanisms due to rotational movement of the HDD drivers and the data head speed so as to keep the performance under control, the movement disturbances should be accurately monitored. Disturbance Observers (DOBs) increase the control system robustness whilst improving the dynamic performance of the systems without employing sophisticated calculations and prerequisite; the plant inverse model calculation is eliminated in this method which empowers the usage and simplifies its implementation. This paper focuses on the suppression of vibration using Disturbance Observer and compares it with PID controller and Intelligent Active Force Controller to figure out the advantages of DOB.
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