On Sat, 29 Jul 2006 17:52:52 +1000, "Rod Speed"
wrote:

kony wrote
Rod Speed wrote
Jon D wrote

If I have a hard drive which has a protective sheet of metal
on one side and the circuit board on the other side then
which of these two side should get the most cooling?

Varys with the drive design. The only real way to answer that
question is to try it both ways and monitor the drive SMART temp.

NO, it does not vary per drive design,

Fraid it does. Most obviously with the older Barras which
have a metal plate and rubber mat over the logic card etc.

plate and rubber don't suddenly make a cover plate more
conductive than it is, if you cool the area with longest
conduction path and least tRise, you've let the rest get
hotter than it otherwise would.


or rather, all drive designs are putting the board
on the bottom, and a thin cover on the top,

Plenty of top covers arent thin.

On modern drives?
Which ones?



thus need more cooling on the bottom
circuit board than (if any on) the top cover.

Not a ****ing clue, as always. Plenty of drives still get
rid of quite a bit of heat thru the metal body of the drive.

Bottom, yes. The top only gets hot as a function of how hot
the interior was, because the bottom wasn't cooled enough,
and of course a minor friction of platter/air inside the
chamber but again, it is not only as well but better cooled
by the bottom because the top is still secured by a gasket
material which impedes heat transfer from other portions of
the drive which likewise heat up.



In the majority of drives, the top cover is barely (if at all)
even joined to the rest with a reasonably conductive junction,

Not a ****ing clue, as always.

Rod, stop looking in the mirror.



instead they typically have a silicone
or some other type of flexible gasket.

Separate matter entirely.

So sorry but wrong again.
It is entirely applicable, heat conduction and removal
depends on the thermal gradient, cooling of the hotter parts
or at least those with best thermal junctions to the other
areas needing cooled more than passively-without-sink.



They may feel warm but this is more a function of heat
rising because it wasn't removed more immediately from
the hot areas instead of left to heat up surrounding areas.

Have fun explaining how come that cover STILL gets
warm even when the drive is mounted upside down.

Because heat radiates on all directions, not just UP.
Particularly so in a semi-sealed chamber the platters are
in.

However, if your drive is mounted in a case and the cover
feels warm, you didn't have ample cooling on the circuit
board side which was what I'd written in the first place.

If your drive is sitting upside down on a desk, the desk
would have to be a better thermal conductor than air for the
temp of the adjacent cover to be cooler than any other part.




I'm sure you'll argue Rod, but you're quite wrong in general

Never ever could bull**** its way out of a wet paper bag.

It seems you always paste that line in when you already know
you've goofed.



and offhand I don't recall any hard drive EVER MADE that
needed as much, let alone more cooling on the top metal.

Have fun explaining those early Barras, child.

There were other drives I ignored, some had the circuit
board on the rear-top, but the same concept applied, that
the side with the circuit board was still the one more
important to cool (though chip densities being lower then,
the airflow for the board was not as important).




In other words, a drive can be completely cooled with airflow
over the bottom only. It cannot with airflow only over the top.

Thanks for that completely superfluous proof that you have
never ever had a ****ing clue about anything at all, ever.

LOL.

Funny how you can't even keep a drive cool, claiming it's
"warm" then simultaneously ignoring those who manage to keep
drives cool to the touch by ignoring your false advice.