Best way to cool a room

Dear Phaedrus:
"Phaedrus" wrote in message
.. .

(formerly)" dlzc1.cox@net wrote in message
news:Rb79b.56185$Qy4.13211@fed1read05...
....
All the manufacturers mention 3rd party labels over breather filter or
holes as a source of failure.

Yes I certainly thought they were sealed, the ones I have seen may have
been, but I searched on the web and found conflicting statements about
this,
some mentioning the hermitical seal and others mentioning the filtered
breathing. It does make sense to have some form of so as to maintain a
fairly constant air pressure inside the drive, as I know the reading head
flys over the drive platter on a cushion of air.

There are hermetic seals *and* filters on all the drives. The hermetic
seal allows access to the drive components for the assemblers, and people
who don't believe "do not tamper" stickers.

The filter is strictly a cost-saving measure. They could have packaged the
drive in a pressure vessel, and sealed a fixed amount of argon (or
nitrogen) inside. I guess they felt that the variation in gas density in
allowing altered "fly height" was less expensive than a ¼ or ½" thick
pressure vessel.

Especially considering hard drives go through pretty radical pressure
swings in a matter of hours... like laptops on aircraft, for example.

I wonder if you could infer barometric pressure with data from the
operations of your hard drive...

David A. Smith

(formerly)" dlzc1.cox@net wrote in message
news:TNE9b.56948$Qy4.5341@fed1read05...
Dear Phaedrus:
"Phaedrus" wrote in message
.. .

(formerly)" dlzc1.cox@net wrote in message
news:Rb79b.56185$Qy4.13211@fed1read05...
...
All the manufacturers mention 3rd party labels over breather filter or
holes as a source of failure.

Yes I certainly thought they were sealed, the ones I have seen may have
been, but I searched on the web and found conflicting statements about
this,
some mentioning the hermitical seal and others mentioning the filtered
breathing. It does make sense to have some form of so as to maintain a
fairly constant air pressure inside the drive, as I know the reading
head
flys over the drive platter on a cushion of air.

There are hermetic seals *and* filters on all the drives. The hermetic
seal allows access to the drive components for the assemblers, and people
who don't believe "do not tamper" stickers.

The filter is strictly a cost-saving measure. They could have packaged
the
drive in a pressure vessel, and sealed a fixed amount of argon (or
nitrogen) inside. I guess they felt that the variation in gas density in
allowing altered "fly height" was less expensive than a ¼ or ½" thick
pressure vessel.

Especially considering hard drives go through pretty radical pressure
swings in a matter of hours... like laptops on aircraft, for example.

I wonder if you could infer barometric pressure with data from the
operations of your hard drive...

David A. Smith

(formerly)" dlzc1.cox@net wrote in message
news:TNE9b.56948$Qy4.5341@fed1read05...
Dear Phaedrus:
"Phaedrus" wrote in message
.. .

(formerly)" dlzc1.cox@net wrote in message
news:Rb79b.56185$Qy4.13211@fed1read05...
...
All the manufacturers mention 3rd party labels over breather filter or
holes as a source of failure.

Yes I certainly thought they were sealed, the ones I have seen may have
been, but I searched on the web and found conflicting statements about
this,
some mentioning the hermitical seal and others mentioning the filtered
breathing. It does make sense to have some form of so as to maintain a
fairly constant air pressure inside the drive, as I know the reading
head
flys over the drive platter on a cushion of air.

There are hermetic seals *and* filters on all the drives. The hermetic
seal allows access to the drive components for the assemblers, and people
who don't believe "do not tamper" stickers.

The filter is strictly a cost-saving measure. They could have packaged
the
drive in a pressure vessel, and sealed a fixed amount of argon (or
nitrogen) inside. I guess they felt that the variation in gas density in
allowing altered "fly height" was less expensive than a ¼ or ½" thick
pressure vessel.

Especially considering hard drives go through pretty radical pressure
swings in a matter of hours... like laptops on aircraft, for example.

I wonder if you could infer barometric pressure with data from the
operations of your hard drive...

David A. Smith



Hello David,

I did read an interesting web page mentioning that hard drives were ok up to
about 10,000ft and they have been used inside space vehicles, it did not
mention what the air pressure was inside of these vehicles though. So one
assume above 10,000ft the air is to thin for the read/write head to fly
across the platter on a sufficiently thick air cushion to prevent touchdown
with drives having an air filter/breather. Also consideration would have to
be taken to normal vibrations that the drive can be allowed to sustain
without touchdown.

I know the object of the exercise is to get the read/write head to be as
close the platter as possible and not allow it to touchdown with any normal
vibration/acceleration experiences to increase data storage density. So this
seems to imply that a higher than normal air pressure that would occur in a
completely sealed drive warming up would cause the read/write head to rise
away from the platter, otherwise I can see no advantage to having a
filter/breather. Also as older drives seem to have been completely sealed,
then at that time the arial density was a lot lower and the need for the
read/write head to be close to the platter was not as great as modern high
density drives, so this is probably why the need for the filter/breather was
introduced.

It seems we are still a long way off replacing drive technology as the most
effective (price v speed & data size) mass storage device for data retention
with no power.

Joe

(Gen) wrote in message . com...
The server room at my work has quite a number of computers(quite big
machines) and gets heated up inspite of the central airconditioning.
The room has glass walls and the only opening is a door. A fan with
about 4 feet tall stand, type which you typically get at Sears or
Walmart, is kept at the door and is working throughout the day.
I am wondering which position will cool the room better, when the fan
is throwing air in the room, or it's throwing out of the room. Fan is
kept at the threshhold of the room.
Thanks for your ideas.

Gen

Not to get too obvious but...

....have you questioned anyone about the
capacity of the AC system or the settings?
....are you concerned about the temperature or the
comfort of the inhabitants?

A fan in the door of an air conditioned room is
a sign that someone isn't thinking too hard.

-tg

"tg" wrote in message
m...
(Gen) wrote in message
. com...
The server room at my work has quite a number of computers(quite big
machines) and gets heated up inspite of the central airconditioning.
The room has glass walls and the only opening is a door. A fan with
about 4 feet tall stand, type which you typically get at Sears or
Walmart, is kept at the door and is working throughout the day.
I am wondering which position will cool the room better, when the fan
is throwing air in the room, or it's throwing out of the room. Fan is
kept at the threshhold of the room.
Thanks for your ideas.

Gen

Not to get too obvious but...

...have you questioned anyone about the
capacity of the AC system or the settings?
...are you concerned about the temperature or the
comfort of the inhabitants?

A fan in the door of an air conditioned room is
a sign that someone isn't thinking too hard.

-tg

If it's central air conditioning and there's inadequate
ventilation to/from the room, then it will overheat.
An open door and fan can help to spread the heat load
to the adjoining room (or hallway).

I'd place the fan to blow air into the room from the
outside and directed at a low level or at the floor
inside the room. The idea is to get the hot air
in the room traveling up and over the fan to mix
with the outside, while pushing cool air in from below.

Next on the list is a meeting with the building's
physical planet manager to arrange for some additional
air conditioning for the room.

"Greg Neill" wrote in message . ..
"tg" wrote in message
m...
(Gen) wrote in message
. com...
The server room at my work has quite a number of computers(quite big
machines) and gets heated up inspite of the central airconditioning.
The room has glass walls and the only opening is a door. A fan with
about 4 feet tall stand, type which you typically get at Sears or
Walmart, is kept at the door and is working throughout the day.
I am wondering which position will cool the room better, when the fan
is throwing air in the room, or it's throwing out of the room. Fan is
kept at the threshhold of the room.
Thanks for your ideas.

Gen

Not to get too obvious but...

...have you questioned anyone about the
capacity of the AC system or the settings?
...are you concerned about the temperature or the
comfort of the inhabitants?

A fan in the door of an air conditioned room is
a sign that someone isn't thinking too hard.

-tg

If it's central air conditioning and there's inadequate
ventilation to/from the room, then it will overheat.
An open door and fan can help to spread the heat load
to the adjoining room (or hallway).

I'd place the fan to blow air into the room from the
outside and directed at a low level or at the floor
inside the room. The idea is to get the hot air
in the room traveling up and over the fan to mix
with the outside, while pushing cool air in from below.

Next on the list is a meeting with the building's
physical planet manager to arrange for some additional
air conditioning for the room.

Well, I would make the *first* step a consult with someone
who understands the design of the system.

It might be possible, depending on the arrangement of the
registers, to balance the system to benefit the room. Odd
things can happen when a new room is built in an existing
space.

-tg

"tg" wrote in message
m...
"Greg Neill" wrote in message
. ..

If it's central air conditioning and there's inadequate
ventilation to/from the room, then it will overheat.
An open door and fan can help to spread the heat load
to the adjoining room (or hallway).

I'd place the fan to blow air into the room from the
outside and directed at a low level or at the floor
inside the room. The idea is to get the hot air
in the room traveling up and over the fan to mix
with the outside, while pushing cool air in from below.

Next on the list is a meeting with the building's
physical planet manager to arrange for some additional
air conditioning for the room.

Well, I would make the *first* step a consult with someone
who understands the design of the system.

Sure, if you don't mind having the servers overheating and
crashing in the meantime.


It might be possible, depending on the arrangement of the
registers, to balance the system to benefit the room. Odd
things can happen when a new room is built in an existing
space.

Exactly.