Recording technology for the MG04ACA400E is not stated in any Toshiba document we have checked (Toshiba MG series enterprise capacity HDD product page, checked October 2026). The nearest model with a sourced answer is the HDWD240 (SMR).
MG - MG series - 3.5-inch enterprise capacity drives. (Toshiba - enterprise HDD model nomenclature)04 - Series generation number. (Toshiba - enterprise HDD model nomenclature)ACA - we have not found a Toshiba document defining this segment400 - Capacity field: 400 denotes 400GB. (Toshiba - enterprise HDD model nomenclature)E - we have not found a Toshiba document defining this segmentNearest model with a sourced answer: HDWD240 (Toshiba P300 4TB, SMR). Listed for comparison only - two part numbers can use different recording methods, so its answer is not MG04ACA400E's.
Live rankings this model belongs to: every 4TB hard drive.
Checked, and it does not state this part number's recording technology: Toshiba MG series enterprise capacity HDD product page · 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 | MG04ACA400E |
| Brand | Toshiba |
| Family | MG Series |
| Capacity | 4TB |
| Form factor | 3.5" |
| Rotational speed | 7200 RPM |
| Cache | 256 MB |
| Recording technology | — |
| Workload rate | 550 TB/year |
| Warranty | 5 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 Toshiba MG series enterprise capacity HDD product page 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 HDWD240, which is SMR.
The recording technology is unsourced, so we cannot clear it for arrays either way. What the spec table does say: a 550TB/year workload rating, which is NAS-or-higher class duty and a 5-year warranty. For an array, prefer a 4TB drive whose recording technology is sourced, such as the HDWD240 (SMR).