The Western Digital 20TB Ultrastar DC HC560 7200 rpm SATA III 3.5″ Internal HDD – 0F38785 is a cutting-edge, helium-sealed, enterprise-class hard disk drive designed for ultra-high capacity, power efficiency, and long-term reliability in the most demanding 24/7 data center and cloud storage environments. This drive features Western Digital’s innovative OptiNAND technology for enhanced performance and capacity.

Key Features

• Capacity: A massive 20TB of storage, making it ideal for hyperscale and large-scale data needs.
• Form Factor: Standard 3.5-inch, ensuring broad compatibility with server and storage array bays.
• Interface: SATA III (6 Gb/s), providing a high-speed and widely compatible connection.
• Rotational Speed (RPM): 7200 RPM, delivering robust performance for mechanical drives.
• Cache Size: A substantial 512MB, optimizing data flow, reducing latency, and improving responsiveness under heavy workloads.
• Max. Sustained Transfer Rate: Up to 291 MB/s, indicating strong sequential read/write capabilities for large file transfers and continuous data streams.
• Workload Rating: An impressive 550TB per year.

Specifications

Reliability:

• • MTBF (Mean Time Between Failures): An industry-leading 2.5 million hours (projected), emphasizing its suitability for continuous, mission-critical operations where downtime is unacceptable.
  • Annualized Failure Rate (AFR): 0.35%.
• HelioSeal™ Technology: A fundamental feature. This enables a 9-disk platform (with 2.2TB per platter), allowing for:
  • Higher Capacity: More platters packed into the same form factor.
  • Lower Power Consumption: Reduced internal drag, leading to significant power savings .
  • Improved Reliability: Less turbulence and friction contribute to the higher MTBF.
• OptiNAND™ Technology: A key innovation unique to Western Digital’s higher-capacity drives. OptiNAND integrates an iNAND Universal Flash Storage (UFS) Embedded Flash Drive (EFD) with the traditional spinning disk media. This is not a hybrid drive for user data caching.
  • Manage and offload metadata: Critical drive metadata (like repeatable runout and write operation data) is moved from DRAM to the iNAND, freeing up DRAM for primary data caching and improving performance.
  • Enhance areal density: By handling metadata more efficiently, it allows for more tracks per inch (TPI), leading to higher platter capacity.
• Recording Technology: Employs Energy-Assisted Magnetic Recording (EAMR) and Conventional Magnetic Recording (CMR).
• Triple Stage Actuator (TSA): Enhances head-positioning accuracy, delivering better performance and increased areal density.
• Vibration Protection (Enhanced RVS – Rotational Vibration Safeguard): Actively detects and compensates for linear and rotational vibrations, crucial for maintaining consistent performance and reliability in dense, multi-drive server racks.
• TLER (Time-Limited Error Recovery): Essential for RAID configurations.
• Sector Format: Primarily 512e (512-byte emulation), offering broad compatibility.
• Security Features: The 0F38785 model typically includes Secure Erase (SE) technology, providing a fast and effective way to securely wipe data.
• Warranty: Backed by a robust 5-year limited warranty, reflecting its enterprise-grade design and intended long-term, continuous operation.

Ideal Use Cases

• Hyperscale & Cloud Storage: Ideal for massive public and private cloud infrastructures where maximizing capacity per square foot, minimizing power consumption, and ensuring extreme reliability are paramount.
• Massive Scale-Out (MSO) & High-Density Data Centers: Perfect for deployments needing to maximize storage capacity within a limited physical footprint, reducing Capital Expenditure (CapEx) and Operational Expenditure (OpEx).
• Distributed File Systems & Object Storage: Such as Ceph and OpenStack Swift, requiring massive bulk storage with high data durability.
• Big Data Analytics & Archiving Platforms: For scenarios where massive datasets are constantly accessed, processed, and stored, including primary and secondary storage for Apache Hadoop.
• Enterprise Servers & Storage Systems: Providing highly reliable and capacious storage for mission-critical applications, including traditional RAID arrays and server-based storage.