IBM builds 120 petabyte cluster out of 200,000 hard drives

I'm curious: Does anyone here expect that a 1 petabyte device will be a commodity consumer device in 30 years?

With the current failure rate of harddisks, how many failing harddisks can one expect to swap out/in that array every day? I guess it must be a 24/7 job for a team of operators to keep that thing up. Or maybe they swap in spare harddisks by the cabinet...

<i>The drive collective...is expected to store one trillion files — or to put it in Apple terms, two billion hours of MP3 music.</i><p>Why does it need to be put in Apple terms? How about we put it in Liquid Audio terms?