DDC Fixed Head Disks
mikeford at socal.rr.com
Mon Jun 11 13:18:29 CDT 2007
James A. Markevitch wrote:
>> I do recall some computer equipment that had helium in the enclosure. At least
>> that's what the labels said.
> I have a DDC 7301 drive (same manufacturer as Guy's, but different model),
> and it is definitely filled with helium. Well, it was filled with helium
> 30 years ago ...
> The DDC maintenance manual says it requires oil-free 99.995% pure helium.
> The preventive maintenance procedure indicates that the helium tank is
> good for about 6 months (dropping from 2200psi to 300psi).
> James Markevitch
Just a thought, but while He does leak out of just about everything,
unless something is leaking in I suspect its still He around 1 atm.
More information about the cctech