Comparative Study of Head-Disk Spacing Measurement Techniques between Optical Method and Various In-Situ Methods

Sheng-Bin HU  Zhi-Min YUAN  Wei ZHANG  Bo LIU  Lei WAN  Rui XIAN  

IEICE TRANSACTIONS on Electronics   Vol.E85-C   No.10   pp.1784-1788
Publication Date: 2002/10/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Recent Progress in Information Storage Technology)
magnetic disk drive,  head-disk interface,  in-situ head-disk spacing measurement,  

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The interaction between slider, lubricant and disk surface is becoming the most crucial robustness concern of advanced data storage systems. This paper reports comparative studies among various techniques for the measurement of head-disk spacing. It is noticed that the triple harmonic method gives a reading much closer to the reading of the head-disk spacing obtained optically at on-track center case, comparing with the PW50 method. Specially prepared disks with different carbon overcoat thickness (6.5 nm, 11 nm, 16 nm and 22 nm) were also used to study the reliability and repeatability of the triple harmonic method.