We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Silver 3.5-inch enterprise hard drive with SAS connector

Western Digital

Western Digital Ultrastar DC HC550 18TB SAS 12 Gb/s 512MB 3.5" internal hard drive WUH721818AL5204

SKU CH-CVP8-R24GJ

Enterprise-grade 3.5" SAS drive delivering 18TB capacity with 512MB cache and 2.5M MTBF rating

  • 18 TB capacity for massive data storage
  • SAS 12 Gb/s interface enables fast data transfer
  • 512 MB cache improves read and write performance
  • HelioSeal technology with 9-disk platform delivers high areal density
  • 5 million hours MTBF and 600,000 load/unload cycles for enterprise reliability

Enterprise capacity drive

The Western Digital Ultrastar DC HC550 delivers 18TB of storage on a SAS 12 Gb/s interface for server and data-centre workloads. It targets administrators who need high areal density on a 3.5-inch form factor with 512MB of cache to absorb bursty write traffic. The HelioSeal platform and CMR recording keep the drive in its lane for sequential-heavy object-store tiers.

18TB headroom and limits

Nine disks combine to reach 18TB, giving object storage and erasure-coded pools room to scale before another shelf is justified. The 2.5M MTBF rating and 600,000 load/unload cycles indicate design for always-on duty rather than occasional backups. Random small-block performance and latency-sensitive databases will exhaust IOPS long before capacity fills.

Helium-sealed build and SAS connectivity

HelioSeal hermetic sealing reduces turbulence and power draw across the nine-platter stack, while the SAS 12 Gb/s port enables dual-port multipath cabling in standard drive bays. Unlimited drive-bay support means the unit fits existing 3.5-inch hot-swap cages without special brackets. The 512e/4Kn sector format eases integration with modern storage controllers.

Highlights

  • 18 TB capacity for massive data storage
  • SAS 12 Gb/s interface enables fast data transfer
  • 512 MB cache improves read and write performance
  • HelioSeal technology with 9-disk platform delivers high areal density
  • 5 million hours MTBF and 600,000 load/unload cycles for enterprise reliability

Specifications

No published specifications for this item yet.

Questions about this item

Will the 12 Gb/s SAS interface on this 18TB drive work with my existing 6 Gb/s SAS backplane?

The drive supports 12 Gb/s SAS and will negotiate down to 6 Gb/s on older backplanes; the 3.5-inch form factor fits standard enterprise bays.

How can I confirm the HelioSeal platform and 512MB cache are operating correctly after installation?

Check the drive identification string for WUH721818AL5204, verify 512MB cache is reported, and monitor SMART health attributes for normal operation.

Does the box include the SAS data cable and mounting screws, or must I buy them separately?

The drive ships as a bare 3.5-inch unit; SAS cables and mounting hardware are not included and must be sourced separately for your enclosure.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.