Western Digital Ultrastar DC HC555 20TB - 7200 RPM 512MB SATA III Enterprise HDD - WUH722020ALE6L4 (Bulk)

Massive Capacity & Proven Reliability for the Data Center
The Western Digital Ultrastar DC HC555 20TB HDD is designed to meet the explosive growth of data in cloud and enterprise data centers. Built on the proven HelioSeal® platform, which seals the drive with helium to reduce air turbulence and power consumption, the DC HC555 enables massive capacity with a low total cost of ownership (TCO). This drive utilizes Energy-Assisted Perpendicular Magnetic Recording (ePMR) technology to deliver higher areal density and storage efficiency without compromising reliability.

Performance & Precision
Equipped with a large 512MB cache and spinning at 7200 RPM, the Ultrastar DC HC555 delivers sustained transfer rates of up to 269 MB/s (257 MiB/s) to handle high-intensity workloads. It features the industry-first Triple-Stage Actuator (TSA), which enhances head-positioning accuracy, delivering better performance and data integrity even in multi-drive environments with rotational vibration.

Enterprise-Class Durability
Engineered for 24/7 operation, the DC HC555 offers an industry-leading 2.5 million hours MTBF (Mean Time Between Failures) and a 550TB/year workload rating. It includes advanced power management and Self-Encrypting Drive (SED) options (on specific models) to protect critical data, making it the ideal foundation for hyperscale storage, distributed file systems, and reliable backup archives.

• Capacity: 20TB
• Interface: SATA III 6Gb/s
• Speed: 7200 RPM Class
• Cache: 512 MB
• Technology: HelioSeal, ePMR, Triple-Stage Actuator (TSA)
• Durability: 2.5M hours MTBF, 5-year warranty