With 1.2 million hours MTBF, server duty cycle, next-generation SATA technology and state-of-the-art vibration tolerance, WD RE2 7200 RPM drives offer the best combination of reliability, high capacity and performance for enterprise applications. RAID-specific time-limited error recovery (TLER) - this feature, unique to WD, prevents drive fallout caused by the extended hard drive error-recovery processes common to desktop drives. Rotary Acceleration Feed Forward (RAFF) - optimizes operation and performance when the drives are used in vibration-prone multi-drive systems such as rack-mounted servers and network storage. 1.2 million hours MTBF, 24x7 100% duty cycle - the highest available reliability rating on high capacity drives.