Western Digital · NAS
WD103KFBX
WD Red Pro 10TB
SATA 6Gb/s · 3.5-inch · CMR
Check your options
An exact Amazon listing has not been verified for this model yet.
Compare alternatives ↓As an Amazon Associate I earn from qualifying purchases.The Western Digital WD103KFBX is a 10TB WD Red Pro hard drive for NAS storage, using SATA 6Gb/s in a 3.5-inch form factor.
Manufacturer specifications
| Model number | WD103KFBX |
|---|---|
| Nominal capacity | 10 TB · 10000 GB |
| RPM | 7200 |
| Interface | SATA 6Gb/s |
| Recording | CMR |
| Cache (MB) | 512 |
| Form factor | 3.5-inch |
| Workload rating (TB/year) | 550 |
| Physical sector size (bytes) | 4096 |
| Manufacturer limited warranty | 5 years (eligible new drives) |
| Sustained transfer (up to MB/s) | 267 |
Source: Western Digital WD Red Pro manufacturer datasheet. Reviewed 2026-08-21. 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 267 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.
Before ordering
Match WD103KFBX, 10TB and SATA 6Gb/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.
Seagate · IronWolf
ST10000VN0008
10TB · SATA 6 Gb/s · CMR
Compare with WD103KFBX →View on Amazon US ↗ASIN B07J35YWQY · Check price and conditionSeagate · IronWolf Pro
ST10000NT001
10TB · SATA 6 Gb/s · CMR
Compare with WD103KFBX →View on Amazon US ↗ASIN B0B94NQCV5 · Check price and conditionSeagate · IronWolf
ST10000VN0004
10TB · SATA 6 Gb/s
Compare with WD103KFBX →View on Amazon US ↗ASIN B01I1HI65E · Check price and conditionWD103KFBX questions answered
Is WD103KFBX CMR or SMR?
The manufacturer lists CMR recording for WD103KFBX. Other models and capacities in the same family can differ.
What connection does WD103KFBX need?
WD103KFBX uses SATA 6Gb/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 WD103KFBX provide?
Its nominal capacity is 10000 GB, approximately 9313.2 GiB before formatting. The filesystem, reserved space and any RAID redundancy reduce usable capacity further.
What warranty is listed for WD103KFBX?
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.