"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

Arfa