Characterization of Mechanically Induced Timing Jitter in Synchronous Writing of Bit Patterned Media

Potential sources of timing errors in writing bit-patterned media are experimentally characterized. This paper describes a time-domain analysis of jitter in a disk drive that is identified as the effect of spindle speed variation. The jitter during head-disk interaction is characterized by a frequency modulation analysis. The impact of head vibration on write timing is also demonstrated using images reconstructed from read signal.