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Standard 3.5 inch hard drive with silver metal casing and printed label

Western Digital

Western Digital Ultrastar DC HC550 18TB 7200RPM SATA 512MB 3.5" Hard Drive

SKU CH-DHYP-4W273

An 18 TB desktop drive spinning at 7200 RPM with a 512 MB cache and 4.16 ms average latency for high-capacity storage

  • InterfaceSATA
  • Capacity18TB
  • RPM7200 RPM
  • Cache512MB
  • Average Latency4.16ms
  • 18TB capacity for massive data storage
  • 7200 RPM spindle speed enables fast sequential access
  • 512MB cache buffers heavy write workloads
  • SATA 6Gb/s interface fits standard servers
  • 16ms average latency supports responsive reads

Ultrastar DC HC550 18TB enterprise drive

The Western Digital Ultrastar DC HC550 is a 3.5-inch internal hard drive built for desktop and server environments that demand high capacity. It spins at 7200 RPM and provides 18TB of storage through a SATA interface with a 512MB cache buffer.

Suited for bulk storage arrays

This drive fits users who need a single large volume for backups, media libraries or cold data tiers where sequential throughput matters more than random access speed. Buyers who require low-latency transactional performance or solid-state responsiveness should consider flash-based alternatives instead.

SATA 6Gbps interface with 512MB cache

The SATA connection and 512MB cache determine how the drive integrates with host controllers and handles burst transfers. Average latency is rated at 4.16ms, reflecting the mechanical 7.2K rotational speed.

Highlights

  • 18TB capacity for massive data storage
  • 7200 RPM spindle speed enables fast sequential access
  • 512MB cache buffers heavy write workloads
  • SATA 6Gb/s interface fits standard servers
  • 16ms average latency supports responsive reads

Specifications

BrandWester Digital
SeriesUltrastar DC HC550
InterfaceSATA
Capacity18TB
RPM7200 RPM
Cache512MB
Average Latency4.16ms

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