Western Digital 500GB WD RE4 3.5" Serial ATA II

High-performance technology.With a combination of 64 MB cache. dual processors and dual stage actuation WD RE4 drives deliver lightning-fast performance in demanding server and storage applications.24x7 reliability.Each drive is put through extended burn-in testing with thermal cycling to ensure reliable operation.WD RE4 enterprise SATA hard drives combine 64 MB cache with dual processors and dual stage actuation for lightning-fast performance in demanding server and storage applications. Technologically advanced acoustics minimize noise. Cool drive operation and enhanced reliability features help protect the drive and the data stored on it.Key FeaturesMassive capacity - WD RE4 Enterprise SATA drives are available with up to 2 TB's of cavernous capacity.Dual actuator technology - A head positioning system with two actuators that improves positional accuracy over the data track(s). The primary actuator provides coarse displacement using conventional electromagnetic actuator principles.