The study of testing techniques for positioner of servo track writer

Abstract

Positioner is the one of important components for servo track writer (STW) of hard disk drive. The good positioner should be able to move a read-write head on a specified track and write the servo signal on magnetic disks accurately. The verification of accuracy for read-write head moving on any track controlled by positioners is presented in this paper. The test strategies is categorized into two parts; to investigate the moving step of read-write head and the dynamic response in seek mode using dSPACE DS1104 controller board for detecting the position from encoder of the positioner. With these experiments, good and bad positioners can be identified in servo track writing process.