Recording technology for the WD30EFZX is not stated in any WD document we have checked (WD Red Plus HDD product brief, checked October 2026). The nearest model with a sourced answer is the WD30EFAX (SMR).
We hold no vendor document that defines the segments of WD30EFZX, so we do not decode it.
Nearest model with a sourced answer: WD30EFAX (WD Red 3TB, SMR). Listed for comparison only - two part numbers can use different recording methods, so its answer is not WD30EFZX's.
Live rankings this model belongs to: every 3TB hard drive.
Checked, and it does not state this part number's recording technology: WD Red Plus HDD product brief · Checked
Without a manufacturer document we can cite, we cannot tell you whether this drive shingles its tracks, and that is the field that decides whether it belongs in an array. Treat it as unverified rather than as probably fine: if the drive is going into a NAS or anything that rebuilds, buy a model whose recording technology is sourced. If it is a single drive holding replaceable data, the recording technology is largely academic and this is a reasonable purchase either way.
| Model number | WD30EFZX |
| Brand | WD |
| Family | WD Red Plus |
| Capacity | 3TB |
| Form factor | 3.5" |
| Rotational speed | 5400 RPM |
| Cache | 128 MB |
| Recording technology | — |
| Workload rate | 180 TB/year |
| Warranty | 3 years |
| Status | Current |
| Replaced by | — |
A dash means we have not found a manufacturer document stating that field for this exact model. We leave it blank rather than filling it from a retailer listing.
We checked WD Red Plus HDD product brief and it does not state this part number's recording technology, so we do not state one. The nearest model with a sourced answer is the WD30EFAX, which is SMR.
The recording technology is unsourced, so we cannot clear it for arrays either way. What the spec table does say: a 180TB/year workload rating, which is NAS-or-higher class duty and a 3-year warranty. For an array, prefer a 3TB drive whose recording technology is sourced, such as the WD30EFAX (SMR).