afaik - as density increases per disk, ex going from 1TB to 4TB, power efficiency per TB should be better too as long as they are also not also increasing the t

afaik - as density increases per disk, ex going from 1TB to 4TB, power efficiency per TB should be better too as long as they are also not also increasing the total number of spindles by adding new storage nodes. One thing I'm not sure of is if _total load_ for the hall increases as increased accesses may occur because of having more density. The hard disk power management part is really fascinating in terms of keeping the storage cluster software alive and well to be able to respond to requests while keep the hard disks off. A low power SSD cache tier on the front may be part of the solution.