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Silver 3.5-inch SATA hard drive with label showing 18TB capacity

Western Digital

Western Digital WD181KRYZ 18TB 7200 RPM 512MB Cache SATA 3.5" Internal Hard Drive

SKU CH-83ZD-NFSRA MPN WD181KRYZ

Enterprise-class 18 TB hard drive with 7200 RPM, 512 MB cache and SATA interface for demanding storage workloads

  • Total capacity18 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Rotational speed7,200 RPM
  • Cache memory512 MB
  • Max height26.1 mm

Capacity 18TB

  • 18 TB capacity for massive data storage
  • 7200 RPM speed for responsive enterprise workloads
  • 512 MB cache to accelerate frequent read operations
  • 5 million hours MTBF for proven long-term reliability
  • SATA 6.0 Gb/s interface for broad server compatibility

Product identity

The Western Digital WD181KRYZ is an 18TB 3.5-inch internal hard drive built for enterprise storage. It runs at 7200 RPM with a 512MB cache on a SATA 6.0Gb/s interface and carries a 2.5M hour MTBF rating.

Who this suits and who it does not

This drive suits operators of enterprise-class storage systems and data centres that need high-capacity, high-reliability bulk storage. It is not for builders who need the low latency of solid-state media or the throughput of a PCIe interface.

Deciding specification

The SATA 6.0Gb/s interface is the single specification that determines compatibility; the host must provide a matching SATA port and the system must accept a 3.5-inch form factor.

How it compares

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

Price $661.99
Pricier than about 90% of the 4,938 comparable items (median $107.99).
Total capacity 18 TB
Higher than about 93% of the 2,372 comparable items (median 2 TB).
Price per TB $36.78 per TB
Cheaper than about 74% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWD
Product lineGold
Model nameNE-WD181KRYZ
Total capacity18 TB
Recommended useFor Enterprise Storage
Performance
Rotational speed7,200 RPM
Storage
Cache memory512 MB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height26.1 mm
Maximum width101.6 mm
Maximum length147 mm
Shipping weight1.13 kg
Package size196 × 152 × 76 mm

Other versions of this model

5 more in the same range

Questions about this item

Does the WD181KRYZ ship with mounting screws or a SATA cable, or must they be purchased separately?

The drive is supplied as a bare 3.5-inch unit; mounting screws and a SATA 6.0Gb/s data cable are not included and must be sourced separately.

When should I choose the 18TB WD Gold model over the smaller capacities in the same series?

Select the 18TB version when you need maximum capacity per bay for enterprise workloads such as large-scale RAID arrays, backup targets or surveillance storage, while still benefiting from the 7200 RPM speed and 512MB cache.

What sustained throughput can I expect from the 7200 RPM SATA 6.0Gb/s interface in a typical server chassis?

The 7200 RPM spindle and SATA 6.0Gb/s link deliver sequential read and write speeds suited to heavy enterprise workloads, with the 512MB cache helping to smooth burst traffic in multi-drive arrays.

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