Toshiba · NAS
HDWG81JXZSTB
N300 Pro 18TB
SATA 6 Gb/s · 3.5-inch · CMR
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Compare alternatives ↓As an Amazon Associate I earn from qualifying purchases.The Toshiba HDWG81JXZSTB is a 18TB N300 Pro hard drive for NAS storage, using SATA 6 Gb/s in a 3.5-inch form factor.
Manufacturer specifications
| Model number | HDWG81JXZSTB |
|---|---|
| Nominal capacity | 18 TB · 18000 GB |
| RPM | 7200 |
| NAS bays | 24 |
| Interface | SATA 6 Gb/s |
| Recording | CMR |
| Cache (MB) | 1024 |
| Form factor | 3.5-inch |
| Sector format | 512e |
| Idle power (W) | 4.16 |
| Package / region | US retail; manufacturer-documented bulk package alias |
| Workload rating (TB/year) | 550 |
| Average operating power (W) | 7.41 |
| Rotational vibration sensors | Yes |
| Manufacturer limited warranty | 5 years (eligible new drives) |
| Sustained transfer (up to MB/s) | 294 |
| Documented package codes | HDWG81JUZSVB |
Source: Toshiba N300 Pro US datasheet TAEC-2839-R2.0, July 2026, pages 4, 7. Reviewed 2026-09-08. Published specifications, not our benchmark results.
What the specifications mean
- CMR recording is specified for this exact model. Check enclosure support and workload limits before installing it in an array.
- Up to 294 MB/s sustained transfer, as specified by the manufacturer. This is not a measured game-loading or random-I/O result.
- 550 TB/year workload rating. This is a workload limit, not a promise of drive lifespan or a backup guarantee.
- Rotational vibration sensors: Yes. Check the documented drive-bay limit for multi-drive enclosures.
Before ordering
Match HDWG81JXZSTB, 18TB and SATA 6 Gb/s against the selected offer. Check your system’s exact-model compatibility list and the seller’s warranty and return terms.
Amazon US listings
Exact model matches on Amazon.com. A verified ASIN identifies the product; it does not guarantee current stock. Check the selected variant, condition and seller.
No verified exact-model ASIN is linked yet. This does not establish whether the model is currently available. Compare the alternatives below and check their listings.
Same-capacity alternatives with Amazon US links
These models share the drive type, interface class and capacity. Compare their specifications and your system requirements before choosing a replacement.
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Compare with HDWG81JXZSTB →View on Amazon US ↗ASIN B0CZM957F3 · Check price and conditionWestern Digital · WD Gold
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Compare with HDWG81JXZSTB →View on Amazon US ↗ASIN B09BHTP2HC · Check price and conditionWestern Digital · WD Red Pro
WD181KFGX
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Compare with HDWG81JXZSTB →View on Amazon US ↗ASIN B08QVFKGQR · Check price and conditionHDWG81JXZSTB questions answered
Is HDWG81JXZSTB CMR or SMR?
The manufacturer lists CMR recording for HDWG81JXZSTB. Other models and capacities in the same family can differ.
What connection does HDWG81JXZSTB need?
HDWG81JXZSTB uses SATA 6 Gb/s and a 3.5-inch form factor. Match both with the computer, controller or enclosure. An M.2 slot, 2.5-inch bay and 3.5-inch bay are not interchangeable.
How much usable space does HDWG81JXZSTB provide?
Its nominal capacity is 18000 GB, approximately 16763.8 GiB before formatting. The filesystem, reserved space and any RAID redundancy reduce usable capacity further.
What warranty is listed for HDWG81JXZSTB?
Manufacturer specification: 5 years (eligible new drives). A renewed, used, OEM or imported offer can have different coverage. Check the serial number and seller terms before buying.