See the other comment: there is a lot of data that isn't accessed for years at a time, so you're essentially spinning disks for years to save a few seconds of s

See the other comment: there is a lot of data that isn't accessed for years at a time, so you're essentially spinning disks for years to save a few seconds of spin up time. I think he's right - energy is too cheap for this to be a commercially relevant factor to you, but if the true cost of energy was factored in (climate change, the human cost s of the relatively dangerous mining and oil drilling industries, local pollution, etc) then I think that would tip the balance. Oh well. OK, final suggestion, maybe do it and spin it as a public relations win? :)