Investigation of disk damage caused during load/unload using a surface reflectance analyzer

Yonemura, Shinji; Weissner, Stefan; Zhou, Lin; Talke, Frank E.

doi:10.1016/j.triboint.2003.08.004

Cited by 13 publications

(4 citation statements)

References 12 publications

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“…In ref. [32], two different subambient pressure-type sliders were investigated during loading and unloading numerically and experimentally. The FE model presented in ref.…”

Section: Load/unload Dynamicsmentioning

confidence: 99%

Modeling of hard disk drives for shock and vibration analysis – consideration of nonlinearities and discontinuities

et al. 2007

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This paper reviews recent advances (mostly after year 2000) in shock and vibration analysis of hard disk drives (HDD) considering the presence of nonlinearities and discontinuities. Components and dynamic phenomena in HDD where effects of mechanical nonlinearity and discontinuities are significant are discussed, e.g., head actuator suspension, dimple and slider, head-disk interface, fluid dynamic bearing, spinning disks, and load/unload dynamics. Ways to model these nonlinearities and discontinuities are reviewed in detail. Our research on modeling an entire HDD in operating mode subject to shock and vibration using a flexible multibody dynamics formulation is also presented. The numerical simulation of the shock response of a 1-in. form factor HDD is presented. A halfsinusoidal acceleration shock is applied at the base of the HDD. Response of the flying height for different shock amplitudes and duration times is simulated.

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“…In ref. [32], two different subambient pressure-type sliders were investigated during loading and unloading numerically and experimentally. The FE model presented in ref.…”

Section: Load/unload Dynamicsmentioning

confidence: 99%

Modeling of hard disk drives for shock and vibration analysis – consideration of nonlinearities and discontinuities

et al. 2007

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“…By providing a small attitude in the proper direction, the head can catch air as it is flown over the platters to support itself. Too much angle can cause the trailing edge of the head to drag on the surface, causing scratches and ruining the disk [2], or cause it to fly too far from the surface, thereby decreasing the effectiveness of the magnetic field used to record on the medium.…”

Section: Introductionmentioning

confidence: 99%

High-Resolution, Non-Contact Angular Measurement System for PSA/RSA

Sloat

Pan

2011

Volume 7: Dynamic Systems and Control; Mechatronics and Intelligent Machines, Parts a and B

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A non-contact angular measurement system for Pitch Static Attitude (PSA) and Roll Static Attitude (RSA) of hard disk drive sliders is designed and built. Real-time sampling at over 15 KHz is achieved with accuracy of +/−0.05 degrees over a range of approximately 2–3 degrees. Measuring the PSA and RSA is critical for hard drive manufacturers to control and improve the quality and reliability of hard drives. Although the hard drive industry is able to measure the PSA and RSA at the subassembly level at this time, there is no system available that is able to measure PSA/RSA at the final assembly level. This project has successfully demonstrated a methodology that the PSA/RSA can be reliably measured in-situ using a laser and position sensitive detector (PSD) technology. A prototype of the measurement system has been built. This device will allow a continuous measurement between the parked position on the ramp and the loading position just off of the disk surface. This measured data can be used to verify manufacturing processes and reliability data.

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“…The reduction of the flying height is important for increasing the areal recording density in HDDs. Typical flying heights in recent disk drives are less than 10 nm, resulting in a recording density of 78 Mbit/mm 2 [1]. A small particle of dirt could cause a head to ''crash'', touching the disk and scraping off the magnetic coating.…”

Section: Introductionmentioning

confidence: 99%