HDD Ramp Protrusion Structure for High-Disk-Density Loading
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Solution Overview
Problem
The manufacturing of a ramp in a hard disk drive (HDD) becomes difficult when the number of magnetic disks increases, as the components need to be formed thinner or located closer together, complicating the design and assembly process.
Innovation Solution
The HDD design incorporates a ramp load mechanism with protrusions that have specific surface and structural features, including inclined and flat regions, to facilitate the movement of head gimbal assemblies between load and unload positions while maintaining precise spacing and preventing interference, allowing for a larger number of magnetic disks without compromising the ramp's functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of magnetic disks is increased, then the storage capacity is improved, but the manufacturing difficulty of the ramp increases due to thinner components and closer spacing
Solution Approach 1:
The ramp is divided into multiple protrusions arranged in the axial direction, with each protrusion serving as an independent support structure for individual magnetic disks. This segmentation allows each protrusion to be manufactured with standard thickness while accommodating multiple thin disks through the array of protrusions
Solution Approach 2:
The protrusions are arranged in the axial direction (thickness direction) rather than only in the radial direction, creating a three-dimensional structure that efficiently utilizes the limited thickness space. This dimensional arrangement allows multiple magnetic disks to be supported with adequate spacing without increasing the overall thickness of the ramp
2Quantity of substance
If components are formed thinner to accommodate more magnetic disks, then the storage capacity is improved, but the structural strength and reliability of the ramp decreases
Solution Approach 1:
The ramp structure is segmented into multiple protrusions, where each protrusion is a complete, structurally sound unit with sufficient thickness. This segmentation allows the ramp to support more magnetic disks without compromising the structural integrity of individual support elements
Solution Approach 2:
Multiple protrusions are combined into a single integrated ramp structure, distributing the mechanical load across multiple support points. This combining approach maintains overall structural strength while enabling the accommodation of thinner individual magnetic disk components
3Quantity of substance
If components are located closer together to increase disk density, then the storage capacity is improved, but the risk of interference between components increases
Solution Approach 1:
The protrusions are segmented and spaced apart in the axial direction with gaps between them, creating distinct separation zones for each magnetic disk. This segmentation prevents interference between adjacent components while maintaining high disk density through efficient space utilization
Solution Approach 2:
Gaps are introduced as intermediary spaces between the protrusions, allowing each magnetic disk to operate independently without direct contact or interference with adjacent disks. These gaps serve as buffer zones that prevent harmful interactions while maintaining compact overall dimensions
Data Source
AI summary
A disk device according to an embodiment includes head gimbal assemblies, a ramp, and magnetic disks. The ramp has a wall and protrusions arranged in an axial direction with a gap. Each of the protrusions includes a first surface facing the gap, a second surface located opposite to the first surface, a side surface, and a limiter protruding from the side surface. Each of the first surface and the second surface includes a first inclined region, a first flat region, and a first middle region located between the first inclined region and the first flat region. The limiter is located between two first flat regions. A width between two first middle regions is less than or equal to a width between the two first flat regions and is at least partially shorter than the width between the two first flat regions.