WD Ultrastar HC555 3.5" 18TB SATA Internal HDD

Western Digital Ultrastar DC HC555 18TB Internal HDD combines massive capacity with enterprise-grade reliability to support the most demanding data environments. This 3.5" SATA III hard drive is engineered for nonstop operation in data centers, hyperscale deployments, and professional IT ecosystems that require consistent performance and long-term durability.

Designed for high-density storage, the DC HC555 delivers 18TB of usable capacity in a single drive, enabling fewer spindles and simplified storage architectures without sacrificing performance. The drive operates at 7200 RPM with a substantial 512MB cache, helping to accelerate random I/O, streaming workloads, and large-scale backups—while maintaining efficient throughput for everyday server tasks.

Key features engineered for continuous operation include HelioSeal technology, which reduces internal turbulence and improves energy efficiency. This results in lower power draw, cooler operation, and enhanced reliability for 24/7 workloads in data centers and enterprise environments.

Why choose Ultrastar DC HC555 for your storage strategy?

• Massive 18TB capacity in a single drive to maximize density and minimize rack space
• 3.5" enterprise-class form factor with SATA III interface for broad compatibility
• 7200 RPM performance paired with a large 512MB cache for responsive data access
• HelioSeal efficiency reduces power consumption and improves reliability in demanding environments
• Enterprise-grade reliability designed for continuous operation and heavy workloads