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Fly and lubricant contact, or surfing recording, is one of interface solutions for 5~10 Tb/in2 of magnetic recording. One of major challenges for surfing schemes comes from how to sustain the dynamic stability of the head disk interface (HDI). This paper explores the mechanism of slider's dynamic stability in surfing on the lubricant by means of an analytical model including air bearings, surface...
It is proposed to overcome lube depletion problem in future hard disk drives by using vapor lubrication. The lube film formation process on disk surface in vapor lubrication is studied theoretically based on fundamental adsorption and desorption theories. The controlling parameters of lube film thickness and film formation time are identified. It is found that the lube film thickness is controlled...
In this article, the effect of slider air-bearing pressure on the saturated water vapor pressure is explained. The adsorbed water film thickness on slider and disk surfaces as a function of relative humidity at different temperatures is calculated. The dynamic adsorption/desorption equilibrium between water vapor and the adsorbed water films on slider and disk surfaces is discussed. The effects of...
A new trailing pad structure with partially-etched pad is proposed. The effect of the pad shape, trench depth and width was numerically investigated and presented. The thermal protrusion efficiency of the new ABS design which has adopted the new trailing pad structure is also presented.
To sustain an ultra-low and stable flying height (FH) is crucial for achieving high areal densities in magnetic recording. Recently, a new method called thermal flying height control (TFC) has been introduced to the latest generations of disk drives for precise control of slider-disk spacing. It is noted that the TFC technique is able to eliminate almost all static FH loss, but is unable to circumvent...
The flying stability of a thermal actuated slider is simulated. Its static flying height is not sensitive to short range interactions. Although its flying height vibration induced by a shock is relative larger, it can stand for a larger shock to achieve stable flying height comparing to a normal slider with same flying height The thermal actuated slider is especially suitable for ultra low flying...
We present an advanced sub-ambient Femto slider that is less sensitive to altitude change. The air bearing design strategy, analysis and optimization are presented. All air bearing simulations were carried out using data storage institute in-house-developed air bearing simulation software.
A discrete method is used to determine the local air bearing stiffness/damping at each air bearing pad (positive) and recess region (negative). The finite element model of the HDD with such stiffness/damping in the form of springs is used to study the shock response of disk driver at a half-sinusoidal acceleration shock (1 ms/63 g). Results show the by increasing 5 times of local stiffness on top-trailing...
The physics behind the lubricant transfer from disk to slider is explained based on the lubricant transfer model proposed by Marchon. The effects of some important parameters, such as slider air bearing pressure and its gradient on the lubricant transfer are also explained and involved in the calculations. The strategies of slider design to minimize the lubricant transfer are proposed.
An on the on-spot CCD (n, k) compensation approach was used for slider flying height measurement in commercial hard disk drives, and compared the results to tests on the same sliders using an average n, k. The approach relies on using an average slider n and k value from off-line ellipsometry.
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