Paul said:
0-60 C for ST3120827AS
Gr. Jan
While the Seagate documentation gives separate ratings
for temperature and humidity, the two parameters are in
fact related to one another. I learned this from some
nice IBM documentation on IBM disk drives. To get some
sample curves that illustrate the concept, try here:
http://www.hitachigst.com/tech/techlib.nsf/products/Deskstar_7K400
"Deskstar 7K400 Specification v1.4" (~1MB download)
On PDF page 64, is an operating curve that shows how
sensitive the drive is to humidity.
The reason for this, is disk drives are open to the atmosphere.
Disk drives have a "breather hole" and the drive equalizes to
atmospheric pressure. The "breather hole" is shown on PDF page
68 of the Hitachi document. A micron filter prevents particulate
from entering the drive, but not moisture.
If the air is below 15% humidity, then you can run it nice
and hot
A comfortable room is 40% humidity, and on a
steamy summer day (without A.C.), a room can reach 60% humidity.
60% humidity is when your carpets start to mildew. A disk drive
can easily go outside the desirable range of conditions on a
summer's day.[/QUOTE]
Very interesting. So in fact, at 35° (seems to be a fairly typical
operating temp), it's ok if humifity is <60%, but at 45° it needs to be
<32%.
I wonder what our cases are, typically? Probably during warm summers,
many of us operate our drives outside of spec - I wonder if thats why so
many drives fail, so often, when compared to the MBTF?
Ben
