The breadth and depth of Big Data is driving the universal need for higher capacities across a broad spectrum of applications and workloads. Laying the foundation for a worry-free data center, Western Digital delivers the capacity to conquer the data explosion with the Ultrastar DC HC500 series of hard disk drives (HDDs). The DC HC500 series is designed for public and private cloud environments where storage density and cost-efficient infrastructure is critical.
The 18TB Ultrastar DC HC550 HDDs are the first commercial implementation of Energy-Assisted Magnetic Recording technology and utilize the industry's first Triple Stage Actuator. These technologies, integrated with HelioSeal on a 9-disk platform, deliver the highest areal density and unmatched Total Cost of Ownership for customer and market needs.
- 18??, enabled by EAMR
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.
- SATA 6Gb/s & SAS 12Gb/s
Provides compatibility with high-performance data centers.
- 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.
Hard drive - internal
Rotational Vibration Safeguard (RVS), HelioSeal, Conventional magnetic recording (CMR), Media Cache Plus, Two-Dimensional Magnetic Recording (TDMR), Energy-Assisted Magnetic Recording (EAMR), Triple State Actuator (TSA)
Drive Transfer Rate
600 MBps (external)
Internal Data Rate
1 per 10^15
Load / Unload Cycles
Expansion & Connectivity
1 x SATA 6 Gb/s
6.5 Watt (typical) ¦ 5.6 Watt (idle)
Service & Support
Limited warranty - 5 years
Min Operating Temperature
Max Operating Temperature
Min Storage Temperature
Max Storage Temperature
Shock Tolerance (operating)
50 g @ 2 ms half-sine wave
Shock Tolerance (non-operating)
250 g @ 2 ms half-sine wave
Vibration Tolerance (operating)
0.67 g @ 5-500 Hz
Vibration Tolerance (non-operating)
1.04 g @ 2-200 Hz