Verdict

These are closely matched NAS drives of the same capacity - decide on price and warranty. Check the live $/TB above.

ST18000NM000J
Seagate Exos X18 · 18TB · Enterprise
$700 ($38.89/TB)
ST18000NM004J
Seagate Exos X18 · 18TB · Enterprise
$599 ($33.28/TB)

Value at a glance

Price / TB
ST18000NM000J $33.61
ST18000NM004J $33.28
Capacity
ST18000NM000J 18 TB
ST18000NM004J 18 TB
Noise (idle)
ST18000NM000J 29 dB
ST18000NM004J 29 dB

Price history

US · cheapest per day

ST18000NM000J $700 ST18000NM004J $599
zoomed · drag to zoom
$950 $635 $320 Sep 2024 Feb 2025 Jul 2025 Nov 2025 Apr 2026 Sep 2026
ST18000NM000J ST18000NM004J
Capacity 18 TB 18 TB
Recording tech CMR CMR
RAID / NAS safe Yes Yes
Class Enterprise Enterprise
Spindle speed 7200 RPM 7200 RPM
Cache 256 MB 256 MB
Noise (idle) 29 dB 29 dB
Fill Helium Helium
Interface SATA SAS
Failure rate (AFR) - -
Price / TB $33.61 $33.28
Buy
$700
View at Amazon →
$599
View at Amazon →

Highlighted cells mark the stronger spec for a NAS build. Failure rates from Backblaze Drive Stats where available; $/TB uses the cheapest live price. Buy links are Amazon affiliate.

ST18000NM000J

No Backblaze failure data for this model.

5yr warranty · 550 TB/yr rated · 2,500,000h MTBF

ST18000NM004J

No Backblaze failure data for this model.

5yr warranty · 550 TB/yr rated · 2,500,000h MTBF