Drive comparison
HDWG81JXZSTB vs WUH721818ALE6L4
Toshiba N300 Pro 18TB and Western Digital Ultrastar DC HC550 18TB, compared using published manufacturer specifications.
Toshiba
N300 Pro 18TB
HDWG81JXZSTB
SATA 6 Gb/s · 3.5-inch
No verified exact-model Amazon listing yet.
Full specifications & all listings →
Western Digital
Ultrastar DC HC550 18TB
WUH721818ALE6L4
SATA 6 Gb/s · 3.5-inch
$529.00
Amazon US · Used / renewed listing ↗ASIN B09RYLD7GL · as of Sep 12, 2026 04:47 UTC
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What differs between these models?
- Cache (MB): HDWG81JXZSTB lists 1024; WUH721818ALE6L4 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 | HDWG81JXZSTB | WUH721818ALE6L4 |
|---|---|---|
| Manufacturer | Toshiba | Western Digital |
| Product family | N300 Pro | Ultrastar DC HC550 |
| Model number | HDWG81JXZSTB | WUH721818ALE6L4 |
| Capacity (TB) | 18 | 18 |
| RPM | 7200 | 7200 |
| NAS bays | 24 | Not recorded |
| Interface | SATA 6 Gb/s | SATA 6 Gb/s |
| Recording | CMR | Not recorded |
| Cache (MB) | 1024 | 512 |
| Form factor | 3.5-inch | 3.5-inch |
| Sector format | 512e | 512e |
| Idle power (W) | 4.16 | Not recorded |
| Package / region | US retail; manufacturer-documented bulk package alias | Not recorded |
| Workload rating (TB/year) | 550 | Not recorded |
| Average operating power (W) | 7.41 | Not recorded |
| Rotational vibration sensors | Yes | Not recorded |
| Manufacturer limited warranty | 5 years (eligible new drives) | Not recorded |
| Sustained transfer (up to MB/s) | 294 | Not recorded |
| 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
HDWG81JXZSTB
Toshiba N300 Pro US datasheet TAEC-2839-R2.0, July 2026 ↗ · pages 4, 7
Reviewed 2026-09-08. Published specifications; no independent benchmark or failure-rate claim.
WUH721818ALE6L4
Western Digital Ultrastar DC HC550 datasheet ↗ · pages 2
Reviewed 2026-09-07. Published specifications; no independent benchmark or failure-rate claim.