Pumping effect of sliders in hard disk systems

Zhang, B.; Nakajima, Akira

doi:10.1007/s11249-004-2755-6

Cited by 7 publications

(3 citation statements)

References 13 publications

(28 reference statements)

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“…Previous studies have shown that lubricant originally coated on the disk can be transferred to the slider surface through various mechanisms such as evaporation-condensation, migration, electrostatic attractions, and direct pickup due to intermittent contacts [2][3][4][5][6]. The accumulation of lubricant on the ABS has been a serious problem affecting hard disk drive reliability.…”

Section: Introductionmentioning

confidence: 99%

Air Bearing Design to Prevent Reverse Flow from the Trailing Edge of the Slider

Aoki

2009

Tribol Lett

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A simulation approach that relies on an analysis of the flow patterns closest to an air bearing surface (ABS) was used to predict the lubricant accumulation on the ABS of a head slider. The lubricant accumulation patterns obtained through the simulation were in good agreement with experimental results and with our experimental apparatus. We used this method to study and analyze flow pattern droplets close to the trailing edge of a number of sliders and found that there was a reverse flow from the slider's trailing edge on both sides of the trailing pad and behind the read/write element, which could result in a lubricant accumulation on the slider surface close to the trailing edge of a slider and thus lead a transient slider vibration and magnetic-signal loss in a hard disk drive. Further simulations and analyses revealed that the reverse flow is dependent on the depth of slider surface on adjacent to the trailing edge of the slider, and that if the depth is less than a critical depth, which is dependent on the velocity of the disk, the reverse flow could be eliminated. On the basis of these findings, we propose a new ABS design concept for effectively suppressing the reverse flow of lubricants from the trailing edge of the slider. In this concept, the slider has a ''smooth flow pad'' and the depths of outlet recesses are specified as being smaller than the critical depth. It was confirmed by both simulation and experiment that lube accumulation on the slider surface is obviously decreased and the reliability of a hard disk drive with this air bearing design is consequently improved.

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Section: Introductionmentioning

confidence: 99%

Air Bearing Design to Prevent Reverse Flow from the Trailing Edge of the Slider

Aoki

2009

Tribol Lett

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“…2 the recording slider-to-media spacing must approach 2 -3 nm. 4,5 In a previous study we have reported that the dielectric nature of media overcoats have a significant effect on the van der Waals interaction between the head and the disk. Media overcoats are large contributors to this spacing and will have to be minimized in order to attain 2 -3 nm.…”

mentioning

confidence: 99%

“…In earlier models A͑L͒ was taken as a constant with a typical value ϳ10 −19 J. 5 Starting with the simplest case, the Hamaker function A 132 ͑L͒ of substrate 1 interacting with substrate 2 across thickness L of medium 3 ͓see Fig. 1͑b͔͒.…”

mentioning

confidence: 99%