WD Ultrastar DC HC550 18TB Hard Drive 3.5″ Internal 512MB 7200 RPM SAS 12Gb/s 512E SE P3 0F38353 (WUH721818AL5204)

**WD Ultrastar DC HC550 18TB Hard Drive**
A high-capacity 3.5?? internal HDD designed for enterprise and data center use, featuring 18TB storage, 7200 RPM speed, and a 512MB cache for rapid data access. Leverages a SAS 12Gb/s interface for superior throughput and low latency, ideal for demanding workloads. Offers 512E sector formatting for backward compatibility with legacy systems. Built for reliability with enterprise-grade durability, vibration resistance, and optimized power efficiency. Combines massive storage density with robust performance, making it a top choice for cloud storage, AI/ML applications, and large-scale data environments. WD??s Ultrastar legacy ensures trusted endurance and 24/7 operational readiness.