HDD · SATA · 18TB
Seagate Exos X18 vs WD Red Pro 18TB
The price verdict
Seagate Exos X18 18TB has the lower cost per TB.
Price comparison, including shipping; not an overall reliability rating.
↓ Lower cost / TB
Seagate Exos X18 18TB →ST18000NM000J
$363.00
$20.17 / TB
Usedprices last checked 2026-10-14 02:07 UTC
Buy on eBay →Compared drive
WD Red Pro 18TB →$475.00
$26.39 / TB
Usedprices last checked 2026-10-14 02:07 UTC
Buy on eBay →Some “Buy” links earn us a commission. Who pays us.
the short version
- ▸On today's best listings the Seagate Exos X18 18TB is 24% cheaper per terabyte ($20.17/TB vs $26.39/TB). Prices move — check the live table below.
- ▸The Seagate Exos X18 18TB is rated for 550 TB/yr of workload against 300 TB/yr for the WD Red Pro 18TB — the difference between a nearline drive built for constant duty and one meant for lighter NAS cycles.
spec by spec
✓ marks the better value for each comparable specification.
| Spec | Seagate Exos X18 | WD Red Pro |
|---|---|---|
| Cost per TB (today) | ✓$20.17/TB | $26.39/TB |
| Best total price | ✓$363.00 | $475.00 |
| Workload rating | ✓550 TB/yr | 300 TB/yr |
| Warranty | 5 years | 5 years |
| MTBF | ✓2.5M hours | 1.2M hours |
| Cache | 256 MB | 256 MB |
| Spindle speed | 7,200 RPM | 7,200 RPM |
| Recording | CMR | CMR |
| Form factor | 3.5" | 3.5" |
Specs are manufacturer figures for each family; prices are the cheapest in-stock listing found on the last ingest, including shipping. Used and refurbished listings may differ in firmware, sector size and remaining warranty — verify with the seller.
related comparisons