Best 18TB NAS hard drives
WD181KFGX
WD Red Pro
CMR
Capacity18 TB
ClassNAS-Pro
Failure rate-
Price / TBC$60.00
C$1,080best live price
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WD181KRYZ
WD Gold
CMR
Capacity18 TB
ClassEnterprise
Failure rate-
Price / TBC$66.21
C$1,192best live price
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WUH721818ALE6L4
WD Ultrastar DC HC550
CMR
Capacity18 TB
ClassEnterprise
Failure rate-
Price / TBC$38.72
C$697best live price
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WD181PURP
WD Purple Pro
CMR
Capacity18 TB
ClassSurveillance
Failure rate-
Price / TBC$50.38
C$907best live price
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ST18000NT001
Seagate IronWolf Pro
CMR
Capacity18 TB
ClassNAS-Pro
Failure rate-
Price / TB-
ST18000NM000J
Seagate Exos X18
CMR
Capacity18 TB
ClassEnterprise
Failure rate-
Price / TBC$46.04
C$829best live price
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ST18000NM004J
Seagate Exos X18
CMR
Capacity18 TB
ClassEnterprise
Failure rate-
Price / TB-
ST18000VE002
Seagate SkyHawk AI
CMR
Capacity18 TB
ClassSurveillance
Failure rate-
Price / TB-
MG09ACA18TE
Toshiba MG09
CMR
Capacity18 TB
ClassEnterprise
Failure rate-
Price / TBC$29.87
C$538best live price
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MG09SCA18TE
Toshiba MG09
CMR
Capacity18 TB
ClassEnterprise
Failure rate-
Price / TB-
HDWG180
Toshiba N300
CMR
Capacity18 TB
ClassNAS
Failure rate-
Price / TB-

Ranked by measured failure rate (Backblaze AFR). $/TB uses the cheapest live price where available.

Every drive here is a CMR (RAID-safe) 18TB model in current production. For a NAS or RAID array, pick the lowest failure rate you can afford; enterprise drives (Exos, Ultrastar, MG) trade some noise and power draw for the longest workload ratings. See how to choose a NAS drive for the full rundown.

Frequently asked questions

What is the most reliable 18TB NAS drive?
None of the 18TB drives have large-scale Backblaze failure data yet; choose by manufacturer class and warranty.
Are 18TB NAS drives CMR or SMR?
Every 18TB drive we recommend for NAS use is CMR (conventional recording), the RAID-safe choice. We exclude SMR drives from NAS picks.