Ultrastar DC HC550 (0F38314)

18TB Provides 29% more capacity than 14TB helium-filled drives

Ultra-low Watts per Terabyte (W/TB) 21% lower idle W/TB than 14TB Ultrastar helium-filled drives

Triple Stage Actuator and Two-Dimensional Magnetic Recording (TDMR) technology More accurate head positioning, especially in multi-drive environments, for better performance and data integrity

Rotational Vibration Safeguard (RVS) Maintains drive performance in high rotational vibration environments and multi-drive systems

Media Cache Plus architecture Better random write performance

512MB cache buffer Improves response time and data management

Dual Safe, RSA-signed firmware Retains previous firmware version for safe firmware updates, verified with an RSA signature

2.5M hours MTBF and 0.35% AFR Unsurpassed reliability rating for Capacity Enterprise HDD for fewer failures/less service needs


  • 18TB capacity in a standard 3.5-inch form factor
  • CMR technology works with all capacity enterprise applications & environments
  • Reliable, field-proven, 6th generation design
  • Industrys first HDD with Energy-Assisted Magnetic Recording technology improves writability and therefore increases areal density
  • Industrys first Triple Stage Actuator enhances head-positioning accuracy, delivering better performance and increased areal density
  • HelioSeal design delivers outstanding power efficiency
  • 2.5M hours (projected) MTBF rating
  • 4Kn SAS 12Gb/s


  • Cloud & Hyperscale storage
  • Massive scale-out (MSO), high-density data centers
  • Distributed File Systems
  • Bulk storage using object storage solutions like Ceph and OpenStack Swift
  • Primary and secondary storage for Apache Hadoop for Big Data Analytics