Green storage, or making storage more power efficient, continues to be a hot topic of discussion. Massive Array of Idle Disks (MAID) storage platforms pioneered by Copan Systems and Nexsan are almost indisputably green in that they either power drives off or at least spin them down to a slower RPM. The challenge is managing these systems to make sure that data is stored on them in such a way that the amount of off or idle time is maximized to realize that power savings.”]
Source: https://www.darkreading.com/database-security/the-many-shades-of-green-storage