Arfa Daily wrote:
"pimpom" wrote in message
...
Does anyone have specific information about the protection
device at
the power supply inputs of hard disks?

I assume that it's a zener diode or something similar in
action such
as an IC that acts like a precision zener diode. It's not
difficult
to see how such a device would provide protection against
spikes,
over-voltage and reverse voltage by shorting the power rail to
ground and thereby triggering PSU shutdown.

Devices in the BUX C*** series seem to be widely used, but I
have
not been able to find a datasheet or other detailed info. Can
anybody shed some light on the matter?



BUX * devices are usually high voltage transistors

Yes. But transistors have the BUX followed by numeric characters.
These devices have a "C" before numerals.