HDD · SATA · 16TB
Seagate Exos X18 vs WD Purple Pro 16TB
The price verdict
Seagate Exos X18 16TB has the lower cost per TB.
Price comparison, including shipping; not an overall reliability rating.
↓ Lower cost / TB
Seagate Exos X18 16TB →ST16000NM000J
$327.00
$20.44 / TB
Usedprices last checked 2026-10-13 18:07 UTC
Buy on eBay →Compared drive
WD Purple Pro 16TB →$649.99
$40.62 / TB
Newprices last checked 2026-10-13 20:07 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 16TB is 50% cheaper per terabyte ($20.44/TB vs $40.62/TB). Prices move — check the live table below.
spec by spec
✓ marks the better value for each comparable specification.
| Spec | Seagate Exos X18 | WD Purple Pro |
|---|---|---|
| Cost per TB (today) | ✓$20.44/TB | $40.62/TB |
| Best total price | ✓$327.00 | $649.99 |
| Workload rating | 550 TB/yr | 550 TB/yr |
| Warranty | 5 years | 5 years |
| MTBF | 2.5M hours | 2.5M hours |
| Cache | 256 MB | ✓512 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.
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