The drive is a 5400 RPM drive with a 8MB cache, which is sort of standard for laptop hard drives. Although faster 7200 RPM drives are available (even from WD), they tend to be noisier with higher power consumption.
It delivers solid performance at decent power requirements, which is always a good thing as far as notebooks are concerned. WD claims that the drive produces about 25 dB (A) which is pretty quiet and the manufacturer has incorporated various technologies to make the drive more reliable. While 1 TB notebook drives are not new, neither are quiet ones, this WD drive does indeed offer best in class performance.