Nein, nicht was ihr jetzt denkt.

Ich hab auf ner Website dies hier gefunden.

Pump problems?
In I/O letters column #14 somebody asked you about the magnetic field of the PC speaker inside the computer case messing up hard drives.

On German watercooling fora, the newest buzz is that the magnetic field and the current induced by water pumps are harmful to computer circuitry and hard disks. Since I don't know enough about this to say whether this is true or just another "you absolutely need these copper RAM-coolers with a noisy 40mm fan" cr*p, I turn to you.

The most used water pumps in German water cooling rigs are by the company Eheim. A guy in a German water-cooling forum used the following setup:

Pump: Eheim 1048
Probe: 4 windings of 2 cm diameter copper wire
Sennheiser UPM-550 level meter.


The results:

Directly at the pump's casing (in mVeff)
On top: 4 mV
At the side: 7 mV
Back: 1 mV
Front: 0.6 mV

At a distance of 8cm
On top: 0.7 mV
At the side: 0.2 mV
Back: 0.2 mV
Front: 0.2 mV


Do you think that this is indeed harmful to a computer's innards? Most watercooling freaks in Germany now shield their pumps.

Joachim

Answer:
The electro-magnetic radiation from a pump might be harmful, if you've got a nasty sparky brush motor in your pump. I strongly doubt magnetically coupled pump motors (see this review for more information on them) pose any threat, though. Their external magnetic field is laughably small compared with what's needed to wipe a floppy disk, much less a hard drive, and the induced voltages you mention are a long, LONG way below the one-point-something volts that's the lowest signal voltage that I think you'll find anywhere in a modern PC. Unless something in the PC's really, really good at picking up these emissions, and really, really sensitive to noise, I don't think you'll see any effect.


iss die pumpe nun gefaehrlich? ich frag weil einer meiner Kumpels
ne 2800l/h pumpe reinbaun will....warum weiss ich auch net...