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@Stonehedge
I've just been doing some more reading on this. The fact that most USB drives draw so much power is completely new to me. I guess the days of USB1 compliance are well and truly behind us.
I'm sure it must be still possible to find <500ma external drives as so many people have TVs and set top boxes that only provide 500ma from their USB ports and a few years ago there was a wide choice in devices suitable for this without external power.
I guess its progress of sorts. You can't stay backwards compatible for ever.