Western Digital RE WD4000ABYS Hard Drive - 400GB - ...

This WD RE 7200 RPM hard drive is engineered to thrive in a high duty cycle RAID system while still offering traditional low cost-per-capacity desktop value. Designed and manufactured to server-class standards, this WD RE drive provides RAID-specific, time-limited error recovery (TLER) to significantly reduce drive fallout caused by extended drive error-recovery processes and is tested to 1 million hours MTBF.