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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.

How it compares

Measured against everything we stock in Cable Locks & Laptop Extras, at today’s prices. Recalculated every night.

Price $483.99
Pricier than about 90% of the 8,808 comparable items (median $16.99).

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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