It"s the era of the terabyte. That era really launched back in May when Hitachi delivered its 7K1000 terabyte hard drive. However, the 7K1000 was a five platter, ten head device, while Western Digital and Seagate ship four platter, four head devices. That"s right: The Western Digital WD10EACS and Seagate 7200.1 offer a cool 250GB per platter. That"s a lot of bits in a small area. Seagate"s take on a terabyte drive is a more traditional design, while Western Digital plays the green card. Which drive offers better performance and value?