Multi-Channel Slider Air-Bearing Surface for Helium Drive Stability
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Solution Overview
Problem
Conventional slider designs for data storage devices lose pitching stability in lower-pressure helium environments, leading to diminished gas flow and difficulties in maintaining desired lift and pitch stiffness.
Innovation Solution
The introduction of multiple channels on the air-bearing surface of sliders, including center, inner-diameter, and outer-diameter channels, to direct gas flow and increase gas pressure at the trailing end, enhancing slider flight characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional ABS shape is used in helium environment, then the slider can operate in sealed helium drives, but the slider loses pitching stability
Solution Approach 1:
The air-bearing surface is segmented into multiple distinct channels (center channel, inner-diameter channel, outer-diameter channel) that separately direct gas flow to different regions of the trailing end. This segmentation allows independent optimization of gas pressure distribution across different zones, restoring pitching stability in helium environments where conventional single-channel designs fail
Solution Approach 2:
Different channels are positioned at specific locations (center, inner-diameter, outer-diameter) with tailored geometries to create localized gas pressure enhancements where needed. The center channel targets central trailing end regions, while inner and outer diameter channels address peripheral regions, creating a non-uniform gas pressure distribution that optimizes pitch stiffness locally across the slider footprint
2Stability of the object's composition
If multiple channels are added to the ABS, then gas pressure at the trailing end is increased and slider stability is improved, but the device complexity increases
Solution Approach 1:
The multi-channel structure serves multiple functions simultaneously: the center channel, inner-diameter channel, and outer-diameter channel collectively provide gas flow distribution, pressure regulation, and pitch stiffness enhancement. This multi-functional integration achieves improved slider stability without requiring additional separate components or systems, thereby limiting the increase in device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The multi-channel design effectively captures and compresses gas, improving slider stability and flight performance in sub-ambient-pressure conditions, such as those found in helium-filled hard disk drives.
Implementation Method 1
a plurality of channels configured to direct gas in a direction from the leading edge toward the trailing end
Implementation Method 2
The multi-channel design effectively captures and compresses gas, improving slider stability and flight performance in sub-ambient-pressure conditions
Data Source
AI summary
Disclosed are sliders for data storage devices, and data storage devices incorporating such sliders. A slider comprises a leading edge and an air-bearing surface (ABS). The ABS comprises a trailing end comprising a trailing pad, and a plurality of channels configured to direct gas in a direction from the leading edge toward the trailing end, wherein each of the plurality of channels is connected to the trailing end. The plurality of channels may include a center channel, an inner-diameter channel, and/or an outer-diameter channel. The disclosed sliders may be particularly advantageous for lower-pressure operating environments, such as sealed-helium disk drives.