Western Digital's WD Expert EIDE hard drives are the performance champions for advanced desktop personal computers. The Ultra ATA/66 interface, which provides high-speed data transfers, was a "first" for Western Digital. To protect data, we include Data Lifeguard ™, WD's exclusive combination of hardware features and software utilities. Data Lifeguard includes embedded features that guard your data and software tools that make installation, configuration and diagnostics simple and worry-free. It detects and repairs disk defects that may occur after extended use of a hard drive. Speed, performance and reliability are the key features of the WD Expert series.