Drive comparison
ST14000NM001G vs WUH721814ALE6L4
Seagate Exos X16 14TB and Western Digital Ultrastar DC HC550 14TB, compared using published manufacturer specifications.
Seagate
Exos X16 14TB
ST14000NM001G
SATA 6 Gb/s · 3.5-inch
$389.99
Amazon US · Used / renewed listing ↗ASIN B08FQ3VST4 · as of Sep 12, 2026 10:58 UTC
Full specifications & all listings →Western Digital
Ultrastar DC HC550 14TB
WUH721814ALE6L4
SATA 6 Gb/s · 3.5-inch
No verified exact-model Amazon listing yet.
Full specifications & all listings →As an Amazon Associate I earn from qualifying purchases. Match the selected variant, condition and seller terms before ordering.
What differs between these models?
- Cache (MB): ST14000NM001G lists 256; WUH721814ALE6L4 lists 512.
A larger cache, higher RPM or higher advertised sequential speed alone does not establish which drive is better for your workload.
Specifications side by side
| Specification | ST14000NM001G | WUH721814ALE6L4 |
|---|---|---|
| Manufacturer | Seagate | Western Digital |
| Product family | Exos X16 | Ultrastar DC HC550 |
| Model number | ST14000NM001G | WUH721814ALE6L4 |
| Capacity (TB) | 14 | 14 |
| RPM | 7200 | 7200 |
| Interface | SATA 6 Gb/s | SATA 6 Gb/s |
| Cache (MB) | 256 | 512 |
| Form factor | 3.5-inch | 3.5-inch |
| Average idle power (W) | 5 | Not recorded |
| Power-on hours per year | 8760 | Not recorded |
| Manufacturer limited warranty | 5 years (eligible new drives) | Not recorded |
| Sustained transfer (up to MB/s) | 249 | Not recorded |
| Sector format | Not recorded | 512e |
| Drive construction | Not recorded | Helium |
| Power Disable Pin 3 | Not recorded | Not supported (legacy configuration) |
Compatibility and buying checks
- Check sector-format support in the controller and operating system, particularly for native 4K (4Kn) variants.
- Compare new and renewed offers separately. The manufacturer specification does not guarantee the warranty or return policy of a marketplace seller.
Manufacturer sources
ST14000NM001G
Seagate Exos X16 manufacturer specifications ↗ · pages 2
Reviewed 2026-09-07. Published specifications; no independent benchmark or failure-rate claim.
WUH721814ALE6L4
Western Digital Ultrastar DC HC550 datasheet ↗ · pages 2
Reviewed 2026-09-07. Published specifications; no independent benchmark or failure-rate claim.