Western Digital 12TB SATA 6G 7.2K 3.5" HDD Ultrastar DC HC520 HUH721212ALE600 HUH721212ALE600

Western Digital 12TB SATA 6G 7.2K RPM 3.5" HDD

Ultrastar DC HC520 (HUH721212ALE600)

The Western Digital Ultrastar DC HC520 12TB HDD is a high-performance, enterprise-class storage solution designed for data centers, cloud environments, and large-scale storage systems. As the base platform for many OEM drives (including Cisco and Dell variants), this model delivers proven reliability, efficiency, and consistent performance for demanding workloads.

Key Features

• High-Capacity 12TB Storage – Designed for large-scale data storage, backup, and archival systems
• Enterprise-Class Performance – 7200 RPM speed with strong sustained throughput
• HelioSeal Technology – Helium-filled design improves efficiency, lowers power usage, and enhances durability
• CMR Recording Technology – Ensures consistent performance for enterprise applications
• Optimized for Data Centers – Built for continuous operation in multi-drive environments

Technical Specifications

• Brand: Western Digital (HGST)
• Series: Ultrastar DC HC520 (He12)
• Model: HUH721212ALE600
• Capacity: 12TB
• Form Factor: 3.5" LFF
• Interface: SATA III 6Gb/s
• Speed: 7200 RPM
• Cache: 256MB
• Sector Format: 512e
• Recording Type: CMR (PMR)

Transfer Rates:

• Interface: 600 MB/s

• Sustained: Up to 255 MB/s (write), 243 MB/s (read)

• Average Latency: 4.16 ms

• Average Seek Time: 8.0 ms (read), 8.6 ms (write)

Reliability and Enterprise Features

• MTBF: 2.5 million hours
• AFR: 0.35%
• Workload Rating: Up to 550TB per year
• Load/Unload Cycles: 600,000
• Designed for continuous enterprise operation

Advanced Features:

• Dual Stage Actuator (DSA) for precise head positioning
• Rotational Vibration Safeguard (RVS) for stable multi-drive performance
• Media Cache Plus for improved write performance
• Rebuild Assist to support faster RAID recovery
• Instant Secure Erase (ISE) capability

Power and Environmental Specifications

• Power Requirements: +5VDC and +12VDC
• Power Consumption: ~5.3W idle ~7.2W active
• Operating Temperature: 5°C to 60°C

Dimensions:

• Height: 26.1 mm

• Width: 101.6 mm

• Depth: 147.0 mm

• Weight: ~660g

Alternate Related Part Numbers

0F30144
HUH721212ALE600

Why Choose This Drive?

The Ultrastar DC HC520 is a proven enterprise platform across major OEM solutions. It delivers dependable performance, high storage density, and advanced reliability features for modern data center environments. With helium-sealed technology and enterprise-grade engineering, it is well suited for organizations requiring efficient, scalable, and long-lasting storage solutions.