Western Digital Caviar SE 40GB Internal 7200RPM 3.5" (WD400JD-75HKA1) HDD
Different model variations might exist (e.g., WD400BD-75JMA1, WD400BD-75LRA0), but they generally share these core specifications. Idle Mode Acoustics: 31 - 35 dBA. Component Design Life: 5 years. Reliability and Acoustics.