Helium Disk Drive Oxygen Mixture Fe Contamination
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Solution Overview
Problem
Hard disk drives filled with pure helium gas experience premature failure due to iron (Fe) contamination, which is caused by the absence of oxygen, leading to performance degradation and increased fly height of the transducer, resulting in unrecoverable errors.
Innovation Solution
Incorporating a mixture of helium and oxygen gas within the disk enclosure, with an oxygen portion ranging from 1-3% or specifically 1.8-2.3%, to prevent Fe contamination by forming volatile gases that are less likely to deposit on the disk surfaces, and optionally plating the interior components with non-oxidizing materials like nickel to further inhibit oxide formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If pure helium gas is used to fill the disk enclosure, then aerodynamic drag is reduced and power consumption is lowered, but Fe contamination occurs leading to premature failure
Solution Approach 1:
The patent changes the chemical composition parameter of the gas environment by introducing a specific concentration of oxygen (1-3%) into the helium-filled disk enclosure. This parameter modification prevents Fe contamination while preserving the low-density benefits of helium, thus maintaining low power consumption while improving reliability.
Solution Approach 2:
Oxygen acts as an intermediary substance that mediates between the helium environment and the Fe components. The oxygen forms volatile oxides with Fe that have low deposition tendencies, thereby protecting the disk surfaces from contamination while allowing the helium to maintain its aerodynamic benefits.
2Speed
If pure helium gas is used to fill the disk enclosure, then aerodynamic drag is reduced, but Fe contamination causes performance degradation and increased fly height
Solution Approach 1:
The patent modifies the gas composition parameter by adding 1-3% oxygen to the helium environment. This change prevents Fe contamination that would otherwise cause fly height increases, thereby maintaining precise fly height control while preserving the aerodynamic performance benefits of low-density gas.
Solution Approach 2:
The patent converts the potentially harmful absence of oxygen into a benefit by intentionally introducing a controlled amount of oxygen. This oxygen, which would normally be considered a contaminant in high-performance environments, is actually beneficial as it prevents Fe contamination and maintains aerodynamic performance while controlling fly height.
3Reliability
If oxygen is added to prevent Fe contamination, then reliability is improved, but the gas mixture density increases reducing aerodynamic benefits
Solution Approach 1:
The patent optimizes the concentration parameter of oxygen in the gas mixture, limiting it to 1-3% of the total volume. This precise parameter control ensures sufficient oxygen is present to prevent Fe contamination and improve reliability, while the low concentration maintains the overall low-density characteristics of the helium environment, preserving aerodynamic benefits.
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 oxygen mixture significantly extends the incubation time and reduces Fe contamination, thereby increasing the time to failure by approximately five times compared to an oxygen-free environment, maintaining low power consumption and reducing nonrepeatable run out errors.
Implementation Method 1
preventing a premature failure within a disk drive includes forming a substantially sealed disk enclosure from a base and a cover, and adding a mixture of gas to the disk enclosure. The mixture includes a low-density gas portion and an oxygen portion
Data Source
AI summary
A disk drive for storing information representing data includes a base, a spindle rotatably attached to the base, and a plurality of disks having magnetizable disk surfaces attached to the spindle. The disk drive also includes a plurality of read/write transducers for writing to and reading from the plurality of magnetizable disk surfaces, and a cover attached to the base. The cover and base form a substantially sealed disk enclosure. The disk enclosure is substantially filled with a mixture of gases including an oxygen portion in the range of 0.1-3% of the mixture, and a low-density gas portion.