On Friday I copied data to my mirrored mini for 17 hours non stop.
The ambient temperature was 25C, the disks were registering 53C.
On Monday, after just sitting there idle all weekend the disks registered 46C
with an ambient temp of 22C
I copied data for another 4 hours, disks climbed back up to 52C
According to the manufacturer's specs the max operating temperature for
the hitachi's is 60C. I found an article showing the effects of temperature
on disks in Google's own servers
(http://storagemojo.com/2007/02/19/googl ... xperience/
which indicates that high temperatures seems to make little difference for the
first two years but doubles the failure rate thereafter. However they were looking
at 40C+, whereas this is 50C+ which is a big jump. I suspect that the failure rate
at 53C is going to be much higher than double.
I therefore decided to see the effect of some cooling. I borrowed a PS3 add-on fan which
is basically four small fans powered from a usb port so that it could power directly from
the mini. Its obviously noisier than no fan but not too intrusive.
After 30 mins and during constant copying of data the temperature dropped to 29C .....
So I think I am going to add a little cooling to my mini from now on.
The fan I borrowed was http://www.amazon.co.uk/COOLING-FAN-PLU ... B0012CZ488
and it looks as though it can be modified for permament use without too much
problem. Its main faults are a) its too long and b) the usb port is rigid, being designed for the PS3
However I think if I cut it in half (two fans is enough plus quieter) and cut off the end with the
usb port/switch, discard the middle bit with the spare two fans, then the extra cable exposed
by this will allow me to take the usb part round the back and plug it in. It even has a passthu
usb socket so the usb can still be used for extra storage.