Western Digital 120GB 5400RPM 8MB Buffer Serial ATA/150, 2.5INCH, 12MS Seek, Retail Kit Spins at 5400 RPM for fast performance but has power specs similar to slower 4200 RPM drives Low power consumption yields increased reliability WD's exclusive WhisperDrive technology with SoftSeek algorithms make this the quietest 2.5-inch hard drive, regardless of spin speed WD's ShockGuard technology protects the drive mechanics and platter surfaces from shocks DuraStep Ramp locks the heads in a secure position away from the disk to provide another layer of protection when the drive is not in use