This just in – the Seagate Momentus Thin is finally announced on an official basis by the folks at Seagate, and as we promised, here are more details about this 7mm thin 2.5″ hard drive which is the slimmest of its kind in the market. It will come in 160GB and 250GB capacities, where we hope to see it in action in a range of ultra portable machines and netbooks from next year onwards. After all, a thinner hard drive would mean shaving off the thickness of a netbook chassis by some bit as well, which is always a good thing. Other features found on the Momentus Thin include an 8MB cache, a Serial ATA 3Gb/second interface and a 5400RPM spin speed.