Stephen C Woods wrote:
As he leans on his cane, the old codger says....
Well Disks used to come in open cannisters, that is you took the bottom
cover off, and then put the whould pack into the drive, and then
unscrewed the top cover and took it out.. Clearly ventilated. C 1975.
Later we got sealed drives, Kennedy 180 MB Winchesters they were
called (the used IBM 3030 technology). The had a vent pipe with two
filters, you replaced the outer one every 90days (as part of the PM
process). The inner one you didn't touch. Aparently they figured that
it'd be a long time before the inner one got really clogged at 10 min
exposure every 90 days. C 1980
Still later we had a Mainframe running Un*x, it used IBM 3080 drives
these had huge HDA boxes that wree sealed but hav vent filters that had
to be changed every PM (30 days, 2 hours of down time to do them
all). C 1985.
So drives do need to be ventilated, not so much wory about exploding,
but rather subtle distortion of the case as the atmospheric preasure
changed.
Doe anyone rememnber that you had to let you drives acclimate to your
machine room for a day or so before you used them.
Ah the good old days...
HUH???
<scw>
I remember the DSU-10, 16 million 36 bit words of storage, which not
only wanted to be acclimatized, but had platters so large, over a meter
in diameter, that ther was a short crane mounting point on the box.
Failure rate went WAY down after better air filters were installed.
I think they were made for GE by CDC, but never knew for sure. GE was a
mainframe manufacturer until 1970, their big claim to fame was the
GE-645, the development platform for MULTICS. They sold the computer
business, mainframe and industrial control, in 1970 to put money into
nuclear energy, and haven't built a power plant since. Then the
developed a personal computer in 1978, built a plant to manufacture it
in Waynesboro VA, and decided there was no market for a small computer.
--
bill davidsen <davidsen@xxxxxxx>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
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