Ultrastar DC HC550 18TB – SATA, 7200RPM, 512MB Cache, HelioSeal Enterprise HDD

Western Digital Ultrastar DC HC550 18TB SATA HDD

The Ultrastar DC HC550 18TB is a high‑capacity, enterprise‑grade hard drive engineered for data centers, servers, cloud storage, and large‑scale backup environments. Built with Western Digital’s 6th‑generation HelioSeal® technology, Energy‑Assisted Magnetic Recording (EAMR), and Triple Stage Actuator (TSA), it delivers exceptional reliability, low power consumption, and industry‑leading areal density.

With 7200RPM, 512MB cache, and SATA 6Gb/s, the HC550 provides consistent throughput up to 269MB/s, making it ideal for hyperscale deployments, RAID arrays, and long‑term archival storage.

Specifications

Brand: Western Digital
Model: Ultrastar DC HC550
Capacity: 18TB
Form Factor: 3.5‑inch
Interface: SATA 6Gb/s
Transfer Rate: Up to 269MB/s
Disk Speed: 7200 RPM
Cache: 512MB
Recording Technology: EAMR (Energy‑Assisted Magnetic Recording)
Sector Format: 512e
HelioSeal: Yes (6th generation)
Warranty: 5‑Year Limited Warranty

Dimensions & Weight

Dimensions: 5.79" × 4" × 1.03" (L × W × H)
Weight: 690g

Operating Conditions

Operating Temperature: 5°C to 60°C
Non‑Operating Temperature: -40°C to 70°C

Features
Industry‑leading 18TB capacity
Energy‑Assisted Magnetic Recording (EAMR)
Triple Stage Actuator (TSA) for precision head positioning
HelioSeal® for low power + high reliability
CMR recording for universal enterprise compatibility
Optimised for 24/7 data‑center workloads
Excellent watts‑per‑TB efficiency

Most Suitable For
Data center
Cloud storage
Enterprise servers
RAID arrays
Backup & archival storage
High‑capacity NAS system