Seagate has joined Western Digital's previously exclusive 6TB hard drive club, with the enterprise-class 7,200 RPM ST6000NM0004. Priced at around $600 (similar to WD's Ultrastar He6), Seagate's new drive isn't likely to find a home in your gaming rig or office workstation -- but that's not really the point of ultra-high-end hardware, anyway. No, the main reason you should be excited about Seagate's 6TB drive is that the technology that makes such capacities possible will trickle down to mainstream drives, resulting in cheaper 4TB desktop drives, and hopefully the arrival of 2.5-inch 3TB laptop hard drives.