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Silver 3.5 inch enterprise hard drive, HC550 model, 18TB capacity

Western Digital

Western Digital HC550 18TB SAS 12Gb/s 3.5in HDD accessory

SKU CH-JN9Q-BKDXM MPN HC550

Enterprise SAS hard drive with 18TB capacity, 7200 RPM and 269MB/s read speed

  • 18 TB capacity for massive server storage
  • 7200 RPM spindle speed for responsive data access
  • 269 MB/s sustained read rate for high-throughput workloads
  • 512 MB cache buffer to accelerate random I/O
  • SAS 12 Gb/s interface with hot-plug support for enterprise deployment

Enterprise 18TB SAS drive for server arrays

The Western Digital HC550 delivers 18TB of storage on a SAS 12Gb/s interface, built for server environments that require high-capacity, hot-pluggable drives. It operates at 7200 RPM with a 512 MB cache to sustain heavy workloads. This unit is not intended for home PC use.

SAS 12Gb/s interface limits cable length

The 12Gb/s SAS link tops out at 269 MB/s sequential read, so throughput is bound by the interface rather than the media. SAS cabling restricts runs to shorter distances than fibre, and the drive needs a compatible SAS HBA or RAID controller with hot-plug support to function.

Silver 3.5in chassis fits standard server bays

The 3.5-inch form factor slides into standard enterprise drive carriers, and the silver finish matches typical server aesthetics. Hot-plug capability allows replacement without powering down the chassis, reducing maintenance windows. The drive is manufactured in Thailand and carries the Ultrastar product line designation.

Highlights

  • 18 TB capacity for massive server storage
  • 7200 RPM spindle speed for responsive data access
  • 269 MB/s sustained read rate for high-throughput workloads
  • 512 MB cache buffer to accelerate random I/O
  • SAS 12 Gb/s interface with hot-plug support for enterprise deployment

Specifications

No published specifications for this item yet.

Questions about this item

Which capacity version of the HC550 should I choose?

The HC550 is offered in an 18TB capacity with a 512 MB cache, so that is the version to select for maximum storage in a single 3.5in drive bay.

What does the 269MB/s read speed mean once the drive is installed in a server?

It indicates the sustained sequential throughput you can expect from the 7200 RPM platters when reading large, contiguous files in a server workload.

What does the SAS 12Gb/s interface cap in practice?

The SAS 12Gb/s link limits the burst transfer rate to 12 gigabits per second, while the drive’s own media speed tops out at 269MB/s for sustained reads.

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