Characteristics of heat transfer in a helium-filled disk enclosure

Sato, Isamu; Otani, K.; Oguchi, S.; Hoshiya, K.

doi:10.1109/33.16699

Cited by 7 publications

(2 citation statements)

References 3 publications

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“…Most of the advantages obtained from filling HDDs with helium and mentioned above have been confirmed experimentally. Sato et al [6] experimentally observed that helium significantly reduces the operational power and maximum temperature in HDDs. Aruga et al [5] found that helium significantly suppresses the turbulence in HDDs thereby reducing the slider's nonrepeatable vibrations.…”

Section: Introductionmentioning

confidence: 98%

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Thermal Flying-Height Control Sliders in Air-Helium Gas Mixtures

2011

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Filling hard disk drives with air-helium gas mixtures instead of pure helium can balance performance improvement, such as reduced power cost, increased capacity and improved reliability, against manufacturing cost increase. A consistent approach is proposed here to investigate the flying performance of thermal flying height control sliders flying in air-helium gas mixtures. It is found that the smallest power required for a designated flying height appears when the gas mixture is composed of about half helium and half air. The proposed numerical approach can also find application in investigating a slider's flying performance in a humid environment.Index Terms-Flyability, gas mixtures, head-disk interface (HDI), thermal flying-height control (TFC).

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Section: Introductionmentioning

confidence: 98%

“…Most modern HDDs are not sealed and the entire HDD is filled with air at ambient pressure, which relates to several issues concerning the HDDs' reliability [4]- [6]. Compared to some other gases such as hydrogen and helium, air has a higher density and lower thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Thermal Flying-Height Control Sliders in Air-Helium Gas Mixtures

2011

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Investigation of lubricant transfer and distribution at head/disk interface in air-helium gas mixtures

et al. 2018

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Lubricant transfer and distribution at the head/disk interface in air-helium gas mixtures is investigated using a developed model that combines an air-bearing model with a molecular dynamics model. The pressure distribution is calculated by the air-bearing model at the head/disk interface with respect to the helium content and the pressure obtained is then input to the molecular dynamics model to understand the lubricant transfer mechanism. Finally, the effects of pressure at the boundary condition and disk velocity on lubricant transfer are discussed in relation to the helium fraction within the air-helium gas mixtures. Results show there is a decrease in the pressure difference with an increase in the helium percentage, which leads to a decrease in the volume of the lubricant transferred. The results also suggest that the lubricant is not easily to transfer in gas mixtures with a high percentage of helium, even when both higher disk velocities and pressure boundary conditions are applied.

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Thermal flying-height control sliders in hard disk drives filled with air-helium gas mixtures

Liu¹,

Zheng²,

Bogy³

2009

Applied Physics Letters

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This letter employs established approaches to calculate the physical properties of the air-helium gas mixtures and investigates the thermal flying-height control slider’s flying performance in these environments. It is found that at a fixed heater power, the slider’s flying height first increases and then decreases with the fraction of helium in the gas mixture due to the combined effects of changes in the mean free path, viscosity, and thermal conductivity of the gas mixture with helium content. These findings, together with the proposed approach, are useful for future designs of sliders in air-helium mixtures.

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Characteristics of heat transfer in a helium-filled disk enclosure

Cited by 7 publications

References 3 publications

Thermal Flying-Height Control Sliders in Air-Helium Gas Mixtures

Thermal Flying-Height Control Sliders in Air-Helium Gas Mixtures

Investigation of lubricant transfer and distribution at head/disk interface in air-helium gas mixtures

Thermal flying-height control sliders in hard disk drives filled with air-helium gas mixtures

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