324 disks takes up most of a row. When we had to do service maintenance in Canyon Park (fun with NT 3.51 and 4.0, before the days of Terminal Server) I'd walk over to TerraServer and admire it's enormity.
Not any more. Using high density disk enclosures, you can fit that many disks in a third of a rack, and if each disk held 4.5TB you'd have almost 1.5PB of storage!
What an astonishing change in only 15 years!