To reach 400GB in the new model, Hitachi essentially slipped two more 80GB platters into its 250GB Deskstar 7K250--the fastest hard drive we have tested to date (see January's Top 10 Hard Drives). Adding the extra platters didn't affect performance: The 7K400 completed our tests in 34 minutes, 1 second--21 seconds slower than the 7K250, a statistical tie. And in both our Windows and our applications-based tests, it outperformed the average score of all seven 200GB or larger hard drives we've seen, often by 9 to 16 percent.
The drive is not only speedy; Hitachi says it also excels at streaming video--a key function of set-top, TiVo-like boxes and of PCs used as digital video recorders--thanks to its new Streaming Command Set. When used with compatible software, the industry-standard technology alters the drive's error-correcting functions during video streaming to permit minor errors rather than stopping the stream for correction. Although such errors are unacceptable in PC data, this results in smoother video, with rare, blink-and-you-miss-it imperfections. Hitachi says users should be able to turn this feature on and off. (PC World was not able to test it.)
Better streaming abilities aside, this is one fast drive. And at $400, it's a fairly economical way to prepare a new or existing media-savvy PC for high-definition content, where each hour of video can require 8GB or more.
