Facebook has shared more details with Wired.com on its 3rd data center in Prineville.

The plan is to use the building to house a brand-new type of low-power, deep-storage device that Facebook engineers will cook up over the next six to nine months. They’re designing a hard-disk storage server that powers off when it’s not in use, says Tom Furlong, vice president of site operations at Facebook. “It’s going to sit in a dedicated building that is optimized to support this device that we don’t need to access very often.”

What will this building be like? Boxy and quiet, with rows of low-powered machines clicking on and off, says Furlong.