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The Western Digital WD Red Pro NAS HDD WD4003FFBX is a high-performance internal desktop drive designed for use with both PC and Mac systems. With a storage capacity of 4TB and a cache size of 256MB, this HDD offers fast transfer rates of up to 1736 Mbps. Its 7200 RPM rotation speed ensures reliable data access, making it ideal for use in NAS systems. The drive is formatted for HDD storage and features a SATA III interface for efficient data processing. With its compact 3.5-inch form factor, this Western Digital Red NAS HDD is a dependable storage solution for various computing needs.