WD · Ultrastar HC520
HUH721212AL5200 is WD Ultrastar HC520 12TB SAS-12G. 2 of its 4 segments are defined in WD's published documentation and decoded below; for the rest we have not found a defining document, and they are marked as such. 1 live listing below.
| Segment | What it means | Source |
|---|---|---|
| HUH | Ultrastar He series, helium-filled (earlier branding). | Western Digital |
| 721212 | 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 |
| AL | Not sourced - we have not found a WD document defining this segment. | Not sourced |
| 5200 | Not sourced - we have not found a WD document defining this segment. | Not sourced |
We decode only what the manufacturer documents. There is a large body of community knowledge about the undocumented segments above, much of it probably right, and none of it published by WD - so it does not appear in this table. A reading nobody can check does not belong in a column headed “what it means”. Grammar reference: Western Digital - Ultrastar model-number nomenclature.
HUH721212AL5200 is WD Ultrastar HC520, a 12TB hard drive on SAS-12G. Being a SAS device, it needs a SAS host bus adapter or backplane - it will not run from a motherboard SATA port, though a SATA drive will run on a SAS controller.
We currently track 1 live listing against this exact part number, all of it refurbished or recertified stock. 5 sibling part numbers are documented below - these are the numbers most often mistaken for this one, and the table marks which fields actually differ.
| Manufacturer | WD |
| Family | Ultrastar HC520 |
| Capacity | 12TB |
| Interface | SAS-12G |
| Product class | HDD |
These are the part numbers most often confused with HUH721212AL5200. The differences below come from the same vendor documentation as the decode above - where a field is not documented, the row leaves it blank rather than guessing.
| Part number | Capacity | Interface | Format | |
|---|---|---|---|---|
| HUH721212AL5204 | 12TB | SAS-12G | in catalogue | |
| HUH721212AL5205 | 12TB | SAS-12G | in catalogue | |
| HUH721212ALE600 | 12TB | SATA-6G | 512e | in catalogue |
| HUH721212ALE601 | 12TB | SATA-6G | 512e | in catalogue |
| HUH721212ALE604 | 12TB | SATA-6G | 512e | in catalogue |
Amber cells differ from HUH721212AL5200; grey cells match it.
| Listing | Condition | Pack | $/TB | Price | |
|---|---|---|---|---|---|
| WD Ultrastar 12TB SAS HUH721212AL5200 | Refurb | single | $37.27 | $447.24 | Buy on Amazon |
A manufacturer part number does not imply a manufacturer warranty, and this is where part-number buyers lose the most money. OEM stock, integrator pulls and gray-market units all reach the market under the maker's own numbering. Retailers selling them sometimes state plainly that the manufacturer warranty is none; others simply do not mention it, which is not the same as it being covered.
Coverage attaches to the individual unit and its serial number, not to the part number. That means the only reliable answer comes from the manufacturer, about the specific drive you are being sold.
Ask the seller for the serial number and check it with WD directly before buying. We do not link a checker for this manufacturer because we have not verified one.
A seller warranty is a different promise from a different company. What each warranty tier actually covers · Verify on arrival
4 in-stock listings · same capacity and interface, any part number · ranked by live cost per tb, refreshed about once a day
| Drive | Capacity | Interface | Recording | Condition | $/TB | Price | |
|---|---|---|---|---|---|---|---|
| WD Ultrastar 12TB SAS HUH721212AL5204 HUH721212AL5204 | 12TB | SAS-12G | — | REFURB | $33.25 | $399 | Buy on Amazon |
| HP 12TB SAS 7200RPM LFF Enterprise MB012000GWWFE | 12TB | SAS-12G | — | REFURB | $34.77 | $417 | Buy on Amazon |
| WD Ultrastar 12TB SAS HUH721212AL5200 HUH721212AL5200 | 12TB | SAS-12G | — | REFURB | $37.27 | $447 | Buy on Amazon |
| HGST 12TB SAS 12G 7.2K HUH721212AL4200 | 12TB | SAS-12G | — | REFURB | $37.27 | $447 | Buy on Amazon |
Every 12TB drive we track, ranked by cost per terabyte.
Product pages for HUH721212AL5200: WD Ultrastar 12TB SAS HUH721212AL5200. Each carries that listing's own condition, provenance and alternatives; the priced table above is in-stock offers only.
HUH721212AL5200 is WD Ultrastar HC520 12TB SAS-12G. 2 of its 4 segments are defined in WD's own published documentation - the decode table on this page shows each one with the document that defines it. For the remaining segments we have not found a defining document, and we say so rather than repeating a community guess as fact.
The part number cannot tell you - coverage follows how the unit entered the market, not its designation. Of the 1 live listing we track for HUH721212AL5200, 0 are sold new and the rest used or recertified, and only the new units can carry WD's own cover. Check the specific serial with the manufacturer before buying.
HUH721212AL5200 and HUH721212AL5204 are both in the Ultrastar HC520 range. The variant table on this page lists every sibling we document with what differs.
We track 1 live listing carrying this part number, shown above with condition and cost per terabyte; the cheapest sits under ASIN B07SXVQ5WD. Prices come from Amazon US, re-checked about once a day per listing; the buy links go to the live listing because the price can change between our check and your click.