Western Digital 500GB 32MB Cache 3.5" AV-GP drives are the cool, quiet and reliable choice for always-on 24/7 applications. They are designed for Desktop PC, media center, media server, surveillance DVR, digital signage and other AV systems requiring perfect audio and video, low heat, low power and long term reliability. 24x7 reliability Near silent operation SilkStream Technology Ultra-cool operation Low power consumption 1 million hours MTTF (MTBF) Preemptive Wear Leveling (PWL) Features: Ideal For Lots of storage in desktop PCs, CCTV, DVR Reduced power consumption. Reduced power consumption makes it possible to build systems with higher capacities and the right balance of system performance, ensured reliability, and energy conservation. Cool and quiet. WD GreenPower Technology yields lower operating temperatures for increased reliability and low acoustics perfect for ultra-quiet PCs and external drives. Value. Built to the highest standards of quality and reliability, these drives offer features and capacity at an affordable price. Solid performance. With SATA 3.0Gb/s interfaces, this series of drives offer a full range of performance features. Ultra cool and quiet. Keeping the drive cool enhances reliability.