HGST 4TB (HUS724040ALS640): Recording Status
We have not found a manufacturer document stating the recording technology for this exact part number. We know what the drive is - a HGST 4TB SAS-12G hard drive (3.5") that we track - but a recording technology printed without a source is a guess, and for RAID, NAS or ZFS use that guess is the one that matters. That is a statement about what we have found, not about what HGST has published.
HUS- Ultrastar enterprise series, air-filled. (Western Digital - Ultrastar model-number nomenclature)724040- Capacity and generation field. The leading digits encode capacity in the family's own scheme; each model's own specification sheet states its exact capacity. (Western Digital - Ultrastar model-number nomenclature)ALS- SAS interface. (Western Digital - Ultrastar model-number nomenclature)640- we have not found a HGST document defining this segment
Part-number reference: HUS724040ALS640 — decoded segments, sibling variants and the warranty check. Live rankings this model belongs to: every 4TB hard drive · 4TB SAS drives · HGST 4TB SAS. Product pages for this part number: HGST 4TB SAS 12G LFF Renewed (no current offer).
We hold no SAS model with a sourced recording technology to compare against, and a drive on a different interface would not be a fair comparison - so there is no nearest-model link here.
| Maker | HGST |
| Capacity | 4TB |
| Interface | SAS-12G |
| Recording technology | No maker source found |
No seller we track has HUS724040ALS640 in stock right now. That describes today's listings only - it says nothing about whether the model is discontinued.
How to settle it for this drive
Read the model number on the drive's own label, then find HGST's data sheet or product manual for that family. A document that prints HUS724040ALS640 in its own row of a recording-technology table settles the question. A family page that names no part numbers does not: we have found maker pages that list neither a part number nor a recording method, and we no longer count them as sources. A retailer listing is not a source either - it is a seller's description, and sellers repeat what other listings say.
Documented HGST drives at 4TB
We hold no maker document for any HGST drive at 4TB yet, so there is no documented sibling to compare against.
When a source turns up
When we find a maker document that names HUS724040ALS640, this page will state the answer with that document linked and the date we read it, the same way our documented pages do. Until then, the honest answer is that we do not know.
In-stock drives with sourced CMR, 4TB and up
- WD Gold 8TB - $379.99 · Buy on Amazon
- Ultrastar He10 10TB SATA NAS - $319.00 · Buy on Amazon
- IronWolf 10TB NAS ST10000VN0008 - $349.99 · Buy on Amazon
- WD Red Plus 10TB WD100EFGX - $374.99 · Buy on Amazon