On 11/21/2017 12:53 PM, Carlos E. R. wrote:
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El 2017-11-21 a las 12:42 -0800, Lew Wolfgang escribió:
On 11/21/2017 12:21 PM, Wol's lists wrote:
Yes, we're routinely using Seagate 10-TB disks now. They're interesting, the top of the disk is welded into place to try to keep the helium inside. There's a low-helium alarm too. They're warrantied for 5-years, so we'll see.
I guess then that the gas is presurized. There might be some type of reservoir canister as well.
Why helium, and not nitrogen?
Helium is a noble gas, reacts with nothing. But nitrogen reacts with few things at those temperatures and is cheaper.
I "think" it has to do with the size of the atoms/molecules? Nitrogen has huge atoms compared to helium's and they'd interfere with how low the read/write heads can fly above the surface of the spinning media. Head altitude and data density are inversely proportional. Helium, being such a small atom, is hard to confine, which explains welding the case closed. Of course, I may be all wet here... Regards, Lew -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org