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>The likelihood that the first drive will fail doesn't change because the second one failed

No thats the point, hardware failures on the same machine/rack/psu/site are not independant. A power supply spike that kills drive 0 in a RAID will probably kill the mirror drive 1 as well - that's why RAID isn't a bckup stratergy

I think the point is that Pixar is owned and manged by Jobs. It's a little like finding that MS-Bing doesn't work with IE8

Do you also have RAID (Redundant Array Independant Donuts) ?

Lots of people who didn't fail statistics assume that events are independant. A bit like, the chance of my machine catching fire are 1 in a 1000, my machine did catch fire and I lost both drives - the odds on that happening must be 1 in a million!