This does not directly address the noise problem with PTP cooling fans but is perhaps related. Several years back I decided that the standard arrangement for fans on my PTP 225 was not removing enough heat (I had installed extra drives including Zip, Jaz and 2 extra hard drives, a USB and a firewire card, and had maxed the RAM). A convenient fix involved replacing the speaker from its location on bottom front with an extra fan. It is mounted to blow air into the box and is powered with a feed-through power adapter which plugs into one of the standard four prong power plugs (using only the red and black lines). Since I use an external speaker with the backside jack, I lost nothing by removing the internal speaker. The louvre at the bottom of the front bezel is quite adequate for air inlet to the fan. I have not done actual temperature measurement, but have the subjective sense of stabler operation than previously... no freeze ups or failed reads with the removables.
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