0B48719 WD Ultrastar DC HC555 20TB SATA 512 MB 3.5" Server HDD

High-Density 3.5in Datacenter SATA HDD for Nearline Tiers with the 0B48719

The 0B48719 is a WD Ultrastar DC HC555 datacenter-class 3.5in SATA hard drive engineered for predictable capacity scaling in 24x7 enterprise environments. Optimised for nearline and bulk storage nodes, it delivers a balanced architecture for throughput consistency, rebuild behaviour, and fleet-level manageability in modern rack-based storage platforms.

Designed for integration into software-defined storage and traditional arrays, the 0B48719 leverages EAMR with TDMR to sustain high areal density while maintaining signal integrity at scale. The SATA interface and 512e sector format support broad controller compatibility, while 7200 RPM operation and a 512MB cache help stabilise mixed sequential workloads common in backup, archive, and object storage. For security-aligned deployments, the 0B48719 implements Self-Encrypting Drive capabilities with TCG Enterprise SSC to reduce exposure during drive handling, RMA workflows, and decommissioning. Reliability targets such as 2.5M hours MTBF support capacity expansion plans where operational continuity and predictable replacement cycles are mandatory.

Why Choose the 0B48719?

The 0B48719 is selected when architects need maximum TB per 3.5in bay without shifting to new controller ecosystems. It enables high density-to-power efficiency for nearline tiers, supports consistent fleet operations across homogeneous nodes, and provides security controls that align with enterprise data governance. The 0B48719 also scales cleanly across multi-shelf designs where serviceability, rebuild strategy, and storage economics must remain stable over time.

WD designs Ultrastar platforms around datacenter duty cycles, with engineering focus on sustained operation, controlled acoustics and vibration tolerance, and qualification practices that map to enterprise storage standards and multi-vendor interoperability.

Key Applications:

• Nearline bulk storage tiers
• Backup and archival repositories
• Software-defined object storage nodes
• Scale-out file storage
• Capacity expansion for enterprise arrays

At Happyware - Server Hardware you benefit from non-binding offers tailored to your storage architecture and rollout volume, plus the option to extend warranty coverage up to 6 years to protect long-term capacity investments based on the 0B48719.