The type of HDD used in this system has an altitude operating limit of
nominally 9840ft(3000m). A few operate just over 10K feet, but not by
much. A pressurized case will be needed to for any video system using
HDD's in the US west and many mountainous regions. At 3000m,
atmospheric pressure is about .67 of sea level. At 5000m, it's about
..50 of sea level. The air pressure is needed to float the heads above
the media. Going above the rated altitude leads to a potential head
crash into the media. Not good.

Now the question is the amount of heat dissipation needed to operate
this equipment safely. That will drive the size of the case and case
material or need for heat sinks along with the pressure differential.
Interesting problem.

Frank Whiteley