Track Pitch Design Considering Skew Angles and Adjacent Track Interference in HDD

Masayoshi SHIMOKOSHI  Jay MOSBRUCKER  Kris SCHOUTERDEN  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E98-C   No.9   pp.946-951
Publication Date: 2015/09/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E98.C.946
Type of Manuscript: PAPER
Category: Storage Technology
Keyword: 
perpendicular magnetic recording (PMR),  HDD,  skew angle,  track squeeze,  ATI,  track pitch,  

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Summary: 
Two-track squeeze and adjacent track interference (ATI) are major barriers to increasing track density in hard disk drives (HDD). These depend on skew angles made by a magnetic head and circumferential direction on a magnetic disk. This paper describes relationships between the skew angle and the magnetic core width (MCW) which affects two-track squeeze and ATI performance. We propose a design concept of a track pitch profile at different skew angles considering MCW. Equivalent robustness of ATI performance on different skew angle conditions is obtained with the optimized track pitch.