Magnetic Disk Device Impact Resistance via Non-Uniform Thickness
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Solution Overview
Problem
There is a trade-off between increasing the capacity of magnetic disk devices and maintaining impact resistance, as reducing the thickness of magnetic disks to accommodate more disks decreases rigidity and impact resistance.
Innovation Solution
The magnetic disk device includes a plurality of disk-shaped magnetic disks with through-holes, spacers with through-holes, a hub inserted into the through-holes, and a clamp to hold the disks and spacers. The solution involves arranging the magnetic disks and spacers such that the flat surface height of the disks contacting the outer circumference of the spacers or clamp is lower than that contacting the inner circumference, enhancing impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of magnetic disks is reduced to increase the number of mounted disks, then data capacity increases, but rigidity and impact resistance deteriorate
Solution Approach 1:
The magnetic disk is designed with non-uniform thickness: the center portion has a smaller thickness than the peripheral portion. This local variation in thickness allows the disk to be thinner overall (increasing capacity) while maintaining sufficient rigidity at the periphery (preserving impact resistance). The peripheral region with greater thickness provides structural strength without sacrificing the space efficiency of a thinner overall design.
Solution Approach 2:
The thickness parameter of the magnetic disk is changed from a uniform value to a gradient distribution, where the thickness varies between the center and peripheral regions. Specifically, the peripheral thickness is greater than the center thickness, creating an optimized structural parameter that balances capacity and strength requirements.
2Quantity of substance
If the thickness of magnetic disks is reduced to increase the number of mounted disks, then data capacity increases, but deformation under impact increases
Solution Approach 1:
The magnetic disk is designed with non-uniform thickness: the center portion has a smaller thickness than the peripheral portion. This local variation in thickness allows the disk to be thinner overall (increasing capacity) while maintaining sufficient rigidity at the periphery (preserving impact resistance). The peripheral region with greater thickness provides structural strength without sacrificing the space efficiency of a thinner overall design.
Solution Approach 2:
The thickness parameter of the magnetic disk is changed from a uniform value to a gradient distribution, where the thickness varies between the center and peripheral regions. Specifically, the peripheral thickness is greater than the center thickness, creating an optimized structural parameter that balances capacity and strength requirements.
Data Source
AI summary
A magnetic disk device includes a plurality of disk-shaped magnetic disks, a spacer, a hub, and a clamp. Each of the magnetic disks includes a through-hole in a center section thereof. The spacer is disposed among the magnetic disks, and includes a through-hole in a center section thereof. The hub is inserted into the through-holes of the magnetic disks and the spacers. The clamp presses and holds the magnetic disks and the spacer. At surfaces where the magnetic disks and the spacer or the clamp contact, a flat surface height of an upper surface of at least one magnetic disk that contacts an outer circumference of the spacer or the clamp is lower than a flat surface height of the upper surface of at least one magnetic disk of the magnetic disks that contacts an inner circumference of the spacer or the clamp.