WD Ultrastar DC HC550 18TB SAS 3.5″ 512MB WUH721818AL5201 HDD Hard Disk Drive

**WD Ultrastar DC HC550 18TB SAS HDD (WUH721818AL5201):** A high-capacity enterprise-grade hard drive designed for data-intensive environments. Features 18TB storage, 12Gb/s SAS interface, and a 512MB cache for rapid data access. Built with Energy-Assisted PMR (ePMR) technology and helium-sealed design to enhance durability, reduce power consumption, and minimize heat. Optimized for cloud/edge data centers, it supports heavy workloads (550TB/year) and offers advanced error recovery for 24/7 reliability. Combines massive storage, enterprise performance, and energy efficiency, backed by WD??s 2.5M-hour MTBF rating for mission-critical uptime.