@article{han_callafon_2009, 
  title={Evaluating Track-Following Servo Performance of High-Density Hard Disk Drives Using Patterned Media}, 
  volume={45}, 
  DOI={10.1109/tmag.2009.2025035}, 
  number={12}, 
  publisher={Institute of Electrical and Electronics Engineers (IEEE)}, 
  author={Han and Callafon}, 
  year={2009}
  }