Effect of Magnetic Particles on High Density HDDs

概要

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The magnetic particles of the head and media are known to degrade the performance of the disk drive. Through decades of ongoing improvements of the level of magnetic contamination, although detectable, is low in today's Hard Disk Drives(abbre.HDDs.Yet, exposure to aggressive environments like flying height, thinner films, and very high storage density can still cause tribological as well as magnetic erasures issues leading to poor performance on Error Rates leading to the uncorrectable hard errors on the hard media. There is great interest to control the size and particles in the HDD components. But there isn't a lot of data from the published papers on the subject especially those employing Giant Magneto-Resistive Recording Head Technology. In this paper, we studied the effect of the performance parameters from the magnetic contaminants. By collecting magnetic particles sources from hard disk drive assembly areas on witness plates, we identified the type and size. By doping the wanted magnetic particles on the sliders and fly them, put these heads on the test spin stands, then finally introduce the particles into HDDs we attempt to study the effect of wear at Head disk interface, as well as the magnetic parameters as it affects real performance of the HDD.
社団法人電子情報通信学会の論文
2001-11-01