The WD400UE is a 2.5-inch external hard drive featuring 40GB capacity with 5400RPM spindle speed and 2MB cache buffer. It connects via 40-pin EIDE Ultra ATA-100 (ATA-5) interface, delivering sustained throughput suitable for external storage and archival applications. The slim-line form factor and 2.5-inch design make it compatible with portable computing systems and external enclosures from the early-to-mid 2000s era. Typical use cases include external backup storage, secondary archival drives, and legacy system upgrades where ATA connectivity is required. This unit has been tested and guaranteed; contact G5 Network Group for availability and pricing via quote.
