On Sun, 15 Mar 2015 13:34:16 -0000
Daniel James wrote:

In article , Tim Watts wrote:
I believe the point was: what happens when the PSU melts and
dumps mains to the output and blows your NAS to tiny weeny bits?

That's certainly the right question to be asking.

I thought someone had wanted the NAS and it's PSU to be usable after
the fire, but rereading today I can't find it.

I would hope the NAS had some serious crowbar protection on its
incoming DC in.

Indeed so ... and on the ethernet and USB connectors, though the power
input is more likely to cause trouble.

Ethernet is pretty bomb-proof by design.

USB is very much a weak point. There nothing bar a simple polyfuse protecting
the +5V line, and the I/O ones are totally vulnerable. Indeed, recently I read
about some b**tard designing a device - masquerading as memory stick - that
keeps pulsing these with a very high voltage, resulting in severe MB damage

--
W J G