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Silver 3.5-inch enterprise hard drive with SAS connector and label showing 18TB capacity

Western Digital

Western Digital Ultrastar DC HC550 18TB SAS 12Gb/s 7.2K RPM 512MB 3.5" internal hard drive

SKU CH-F71K-A4BGD

Enterprise 18 TB SAS drive with 7200 RPM, 512 MB cache and 2.5 million-hour MTBF for high-capacity storage

  • InterfaceSAS 12Gb/s
  • Capacity18TB
  • RPM7200 RPM
  • Cache512MB
  • Form Factor3.5"
  • 18 TB capacity for massive data storage
  • SAS 12 Gb/s interface enables fast transfers
  • 7200 RPM with 512 MB cache speeds access
  • 5 million hours MTBF supports reliability
  • HelioSeal 9-disk design delivers 18 TB density

18 TB SAS Enterprise Hard Drive

The Western Digital Ultrastar DC HC550 is an 18 TB internal hard drive with a SAS 12Gb/s interface, 7200 RPM spindle speed and 512 MB cache. Built on a nine-disk helium-sealed platform, it delivers a sustained transfer rate of 269 MB/s and a 2.5 million hour MTBF rating for continuous operation.

Suited for high-capacity object storage

This drive fits object storage systems that use erasure coding and need maximum density per slot. It is not suited for workloads demanding low-latency random access, single-drive desktop use, or environments that cannot accommodate a 3.5 inch SAS connection.

SAS 12Gb/s interface decides compatibility

The drive requires a backplane or controller that supports 12 Gb/s SAS signalling. Without that interface the drive cannot communicate with the host, making the SAS connection the single specification that determines whether this is the correct part.

Punti di forza

  • 18 TB capacity for massive data storage
  • SAS 12 Gb/s interface enables fast transfers
  • 7200 RPM with 512 MB cache speeds access
  • 5 million hours MTBF supports reliability
  • HelioSeal 9-disk design delivers 18 TB density

Caratteristiche tecniche

InterfaceSAS 12Gb/s
Capacity18TB
RPM7200 RPM
Cache512MB
Form Factor3.5"

Domande su questo articolo

Does my server or RAID controller need a SAS 12Gb/s port for this 18TB drive?

Yes, the drive uses a SAS 12Gb/s interface and requires a compatible SAS 12Gb/s HBA, RAID controller or backplane to operate.

Will the 7.2K RPM spindle speed and 512MB cache match the throughput of my existing 7.2K RPM SAS drives?

The drive delivers a sustained transfer rate of 269MB/s and 4.16ms average latency, which is typical for 7.2K RPM enterprise SAS drives.

How can I confirm the HelioSeal platform is healthy after installation?

Check SMART attributes for reallocated sector count and temperature; the drive is rated for 2.5 million hours MTBF under normal enterprise workloads.

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