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Silver 3.5 inch enterprise hard drive with SAS connector and Ultrastar HC550 label

Western Digital

Western Digital 0F38302 18TB 7200 RPM SAS 12Gb/s 3.5in internal hard drive

SKU CH-ZQGF-DBZMR MPN 0F38302

An 18 TB helium-sealed enterprise drive with 7200 RPM, SAS 12Gb/s interface and 512 MB cache for high-throughput storage arrays

  • Capacity18TB
  • RPM7200 RPM
  • InterfaceSAS 12Gb/s
  • Cache512MB
  • Recording TechnologyCMR
  • Form Factor3.5"
  • 18 TB capacity stores massive datasets
  • 7200 RPM spindle delivers high-throughput performance
  • SAS 12 Gb/s interface moves data quickly
  • Helium-sealed design reduces internal turbulence
  • 512 MB cache accelerates frequent read and write operations

18TB enterprise SAS drive

The Western Digital Ultrastar DC HC550 delivers 18TB of conventional magnetic recording storage on a SAS 12Gb/s interface. Its 7200 RPM spindle and 512MB cache suit enterprise servers, storage arrays and backup archives that need sustained throughput.

Check SAS controller and 4Kn support

Verify that your host bus adapter or RAID controller accepts 12Gb/s SAS and can address 4Kn sector formatting. The 3.5in form factor requires a standard drive bay and the helium-sealed design assumes adequate airflow in the enclosure.

Helium sealing and advanced actuator

The helium-sealed enclosure reduces internal turbulence for consistent operation in dense chassis. Advanced actuator technology improves head positioning accuracy, which helps maintain the quoted 27 MB/s sustained transfer rate during heavy sequential workloads.

Points forts

  • 18 TB capacity stores massive datasets
  • 7200 RPM spindle delivers high-throughput performance
  • SAS 12 Gb/s interface moves data quickly
  • Helium-sealed design reduces internal turbulence
  • 512 MB cache accelerates frequent read and write operations

Caractéristiques

BrandWestern Digital
SeriesUltrastar DC HC550
ModelWUH721818AL4201
Part Number0F38302
Capacity18TB
RPM7200 RPM
InterfaceSAS 12Gb/s
Cache512MB
Recording TechnologyCMR
Form Factor3.5"
FeaturesHelium-sealed design, Advanced actuator technology

Questions sur cet article

Does the 0F38302 ship with cables, brackets or a controller, or must those be sourced separately?

The 0F38302 is supplied as a bare 3.5in enterprise drive; SAS cables, mounting hardware and a compatible 12Gb/s SAS controller or backplane are not included and must be purchased separately.

The Ultrastar DC HC550 line includes several capacities — why choose the 18TB model over smaller options?

The 18TB model delivers the highest raw capacity in the HC550 series, reducing the number of drives needed for a given storage target while keeping the same 7200 RPM spindle speed, 512MB cache and helium-sealed design.

What does the 27 MB/s sustained transfer figure mean for everyday workloads on this 18TB SAS drive?

The 27 MB/s rating reflects a conservative sustained throughput baseline; real-world sequential reads and writes on a 12Gb/s SAS link with 512MB cache typically run well above that figure, especially in multi-drive arrays.

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