In the World of Warcraft, the Alterac Mountains are located somewhere between the Western Plaguelands and Hillsbrad, but they are stored right here on these hard drives.

Well, not these hard drives in particular. Blizzard probably wanted to keep all their data handy, so this server blade just comes with blanks.

The WoW server blade has two dedicated hard drive bays.

It seems "A device or blank must occupy all bays during operation."