Seagate's Barracuda 7200.8 is the latest hard drive to offer 400GB of storage, but the drive offers more than just a capacity boost. By packing more data per platter than Seagate's previous Barracuda 7200.7, the 7200.8 also promises superior performance to its predecessor. Does it deliver? To find out we've run the 7200.8 through a punishing gauntlet of benchmarks and real world performance tests against competition from Maxtor and Western Digital.