<Skywolf> Say you have crucial, business data, that absolutely has to be safe.
<Skywolf> So you do the right thing, and invest in a RAID6 system with double parity.
<Skywolf> Which works great. So great that you don't even notice when the first hard drive fails.
<Skywolf> And not even when the second hard drive fails.
<Skywolf> Unfortunately you do notice when the third hard disk fails.