The expression security = usability^-1 can be interpreted in many ways. Either things become far too complicated, so that regular users just don't want to be bothered with them or the amount of energy it takes to complete a security-related task is just insane.

To wipe a 1TB (1024GB) disk with random data or prep a disk for encryption, it takes a little more than 4 days (97 hours) when utilizing /dev/urandom. Who would want to wait 4 days for a supporting task like this to finish? Just considering the energy it takes, to keep the whole system up and running, only to write random data to a disk, clearly demands higher random data bitrates without sacrificing quality. Hardware-RNG's are good alternative but not always available, so you might want to give /dev/frandom a try.

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