Western Digital Scorpio 40GB 5400 RPM Internal 2.5" Hard Drive Fast - spins at 5400 RPM and delivers seek times of 12 ms. It has a standard 2 MB cache with an 8 MB option Efficient - spins at 5400 RPM for fast performance but has power specifications similar to slower 4200 RPM drives. Low power consumption yields increased overall reliability Quiet - features WD's exclusive WhisperDrive technology with SoftSeek algorithms to deliver the quietest 2.5-inch hard drive on the market Rugged - WD Scorpio has a rigid stainless steel cover, unlike other devices, that will withstand greater than 5 pounds of pressure - nearly 1.5 times the industry average - without pinching the motor hub or other internal components