On 11/21/2017 01:16 PM, Carlos E. R. wrote:
A nitrogen molecule is still ridiculously small compared to the head gap. I think the number of gas molecule layers in that gap can be calculated, but it would not be trivial for me after so many years from high school. I'm not sure the size of the molecule matters in gases for the number per volume. Re Avogadro number, mol size...
Helium is indeed hard to confine, but not so hard as hydrogen, though. Any gas is difficult to confine for five years, I think. The length of the junction is very large in comparison to the volume. They would need a screw per centimeter. Perhaps glue would do with other gases and a reservoir canister.
It might be marketing, LOL.
Yeah, it's not the atoms. That was dumb of me. Check here: https://www.seagate.com/files/www-content/product-content/enterprise-hdd-fam... "The feasibility of using helium (He) inside of hard disk drives (HDD) has long been the holy grail of rotating magnetic storage. And after many decades of research and development, there is virtually no debate that replacing air with helium inside the magnetic storage enclosure improves areal density capability (lower windage-induced vibration with low-density helium), reduces the power required to spin (lower spindle power from lower-density helium), and limits increases in device temperature (higher thermal conductivity of helium). With the introduction of the 10TB Enterprise Capacity 3.5 HDD, Seagate offers its helium drive technology to a growing cloud-based data center market that is clamoring for unique and robust storage solutions." Note that this isn't shingled magnetic recording (SMR). (I still like the mental image of a disk head rolling through a field of helium atoms...) Regards, Lew -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org