Why is there an altitude limit for helium drives? If the HDA is a sealed environment, then how can the external air pressure have any effect on the internal operation?
HGST Ultrastar He8 SATA OEM Specification:
https://www.hgst.com/sites/default/files/resources/UltrastarHe8_OEMSpec_SATAmodels_v1.6.pdfIf the answer is to do with the pressure limits of the gas tight seal, then why is there such a huge disparity between the operating and non-operating limits?
And what is the reasoning behind this statement:
"Maximum storage period within shipping package is one year"