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3.5 inch internal hard drive silver metal casing exposed circuit board label with model number

Western Digital

Western Digital Ultrastar DC HC550 18TB 7200RPM SAS 12Gb/s 512MB Cache 3.5-inch internal hard drive

SKU CH-Z8J7-N2A00

High-capacity 3.5-inch drive holds 18 TB with 7200 RPM speed and 512 MB cache over SAS 12 Gb/s

  • Massive 18TB capacity stores vast datasets
  • 7200RPM spindle delivers consistent throughput
  • 12Gb/s SAS interface enables fast data transfer
  • 512MB cache accelerates frequent read operations

Ultrastar DC HC550 18TB enterprise drive

The Western Digital Ultrastar DC HC550 is an 18TB 3.5-inch internal hard drive built for data-centre workloads. It spins at 7200RPM and uses a SAS 12Gb/s interface with a 512MB cache to handle sustained read and write demands.

SAS 12Gb/s interface practical limits

The SAS 12Gb/s link tops out at 12Gb/s, so throughput cannot exceed that ceiling regardless of drive speed. Workloads needing higher bandwidth or lower latency than SAS provides will require a different interface.

How it compares

Measured against everything we stock in 3.5-Inch Internal Desktop HDDs, at today’s prices. Recalculated every night.

Price $327.99
Pricier than about 84% of the 4,938 comparable items (median $107.99).

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Specifications

No published specifications for this item yet.

Questions about this item

Should I choose the 18TB model or a smaller capacity for my storage array?

The 18TB capacity suits high-density arrays where rack space is limited; pick a smaller drive only if your workload does not need that much raw space.

What does the 7200RPM speed mean for daily throughput on a SAS 12Gb/s link?

7200RPM delivers sustained sequential rates that saturate the SAS 12Gb/s bus during large transfers, while random I/O depends on queue depth and the 512MB cache.

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