Multi-Slope HDD Load/Unload Ramp Design
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Solution Overview
Problem
The challenge in hard disk drives (HDDs) is to reduce ramp slope height without losing disk data area or lift height, which limits the number of disks that can be fitted within a standard form factor while maintaining peak slider flying height, especially in emergency power off situations where unloading speed variation poses a risk.
Innovation Solution
Implementing a multi-slope load/unload ramp with varying slope angles, such as two or three different slope angles, to achieve equivalent ramp height reduction without additional loss of disk data area, and optimize slider lift and rebound management to prevent head-disk contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a single-angle sloped ramp is used, then the structure is simple, but the ramp height cannot be reduced without losing disk data area or lift height
Solution Approach 1:
The ramp is divided into multiple segments with different slope angles. The first portion has a first slope angle and the second portion has a second slope angle, allowing each segment to serve a specific function in the head unload/load process while achieving overall height reduction without sacrificing performance
Solution Approach 2:
Different portions of the ramp have different slope characteristics tailored to specific operational requirements. The first portion optimizes for one aspect of head movement while the second portion optimizes for another, allowing local optimization of each segment's function
2Quantity of substance
If ramp height is reduced, then more disks can be fitted in standard form factor, but disk data area and lift height are lost
Solution Approach 1:
By segmenting the ramp into portions with different slope angles, the design achieves height reduction while preserving the necessary lift height and disk data area through optimized distribution of slope characteristics across segments
Solution Approach 2:
The slope angle parameter is changed across different portions of the ramp. The first portion has one slope angle and the second portion has a different slope angle, allowing optimization of both ramp height and functional performance simultaneously
3Productivity
If unloading speed varies, then the unloading process can be optimized for normal conditions, but head-disk contact risk increases during emergency power off
Solution Approach 1:
The second portion of the ramp has a specific slope angle optimized to control rebound and minimize head-disk contact risk during emergency power off conditions, providing local optimization for safety while the first portion handles normal unloading speed requirements
Data Source
AI summary
A multi-slope load/unload ramp for a hard disk drive includes an inner first portion having a non-horizontal first slope and an adjacent outer second portion having a different non-horizontal second slope. The first slope may be steeper than the second slope, and the ramp may further include a third portion adjacent to the second portion and also having a third slope steeper than the second slope, with the ramp configured for positioning the first and second portions to overlap the disk while the third segment may be in part outside the disk. The second slope may be steeper than the first slope, with the ramp configured for positioning the first portion to overlap the disk while the second portion may be in part outside of the disk. Hence, any slider rebound from the steeper portions would occur outside of the disk and avoid a slider-disk crash.