MDD vs Seagate Hard Drives: Price Like for Like, Warranty, and Who Makes the Drive
We earn a commission if you buy through the links on this page, including links to the sellers it describes. You should read everything below knowing that. What we can offer against it is method: the figures here are computed from our own price database rather than supplied by anyone, the ownership facts come from public records we link, and we publish no rating or verdict on any seller - we show you what they sell, what the warranty covers, and how to check a drive yourself.
Matched at the same capacity, interface and condition, MDD averages +4.2% against Seagate per terabyte (median -0.4%) across 10 matches, cheaper in 5 of them - built on 12 MDD and 25 Seagate models. The bigger difference is the warranty: Seagate's own on a new Seagate, the seller's on an MDD, where one is stated at all.
The USPTO record, Seagate's recertified pages and every MDD listing were read at source on 1 October 2026. Prices and counts last refreshed
"MDD vs Seagate" looks like a brand comparison, but the two are different kinds of thing. Seagate designs and builds hard drives. MDD is a label registered to GOHARDDRIVE, INC. that is applied to drives built by others - and, occasionally, by Seagate: one MDD listing we read says it matches a Seagate part number. So the comparison that means something is not "which brand is better", which no data answers, but three narrower ones: what each costs for the same kind of drive, whose warranty you get, and what each listing tells you about the drive's history. This page answers those, with every figure live and every percentage carrying the number of comparisons behind it.
Price, matched like for like
Each row below is one match: a capacity, an interface and a condition where both MDD and Seagate have a listing in stock. It compares the cheapest MDD listing with the cheapest Seagate listing in that cell, per terabyte. There is no shared model to match across two brands, so the cell is the unit; the model columns show how many distinct models sit on each side, so you can see when a cell rests on one drive. A negative difference means MDD is cheaper. Prices are Amazon US listings, in US dollars.
| Capacity | Interface | Condition | MDD $/TB | Seagate $/TB | MDD vs Seagate | Models (MDD / Seagate) | MDD | Seagate |
|---|---|---|---|---|---|---|---|---|
| 2TB | SATA-6G | Used | $50.00 | $31.46 | +58.9% | 1 / 6 | Buy Now | Buy Now BarraCuda 2TB ST2000DM001 |
| 3TB | SAS-6G | Used | $20.00 | $16.00 | +25.0% | 1 / 2 | Buy Now | Buy Now Constellation ES.2 3TB SAS Enterprise |
| 3TB | SATA-6G | Used | $33.33 | $30.17 | +10.5% | 1 / 2 | Buy Now | Buy Now BarraCuda 3TB ST3000DM001 |
| 6TB | SATA-6G | Used | $30.00 | $30.00 | 0.0% | 1 / 4 | Buy Now | Buy Now IronWolf 6TB NAS ST6000VN0041 |
| 10TB | SATA-6G | Used | $28.00 | $32.00 | -12.5% | 1 / 6 | Buy Now | Buy Now SkyHawk AI 10.0TB |
| 12TB | SATA-6G | Used | $27.50 | $25.00 | +10.0% | 2 / 1 | Buy Now | Buy Now IronWolf Pro 12TB NAS ST12000NE0008 |
| 14TB | SATA-6G | Used | $25.71 | $25.93 | -0.8% | 1 / 1 | Buy Now | Buy Now Exos X14 14TB SATA Enterprise |
| 18TB | SATA-6G | Used | $27.22 | $32.22 | -15.5% | 2 / 1 | Buy Now | Buy Now Exos X20 18TB SATA |
| 20TB | SATA-6G | New (MDD: sold as new under the label) | $28.50 | $40.00 | -28.7% | 1 / 1 | Buy Now | Buy Now Exos X20 20TB |
| 20TB | SATA-6G | Used | $32.00 | $33.50 | -4.5% | 1 / 1 | Buy Now | Buy Now Exos X20 20TB |
Across all 10 matches the mean difference is +4.2% and the median -0.4%, with MDD cheaper in 5. The mean and the median can disagree because a single cell can be far out - a small-capacity cell where one MDD listing is priced well above the Seagate equivalent pulls the mean while barely moving the median. Read the cell for the capacity you want rather than the average. One caution on the new cells: an MDD drive stored as new is new by Amazon's condition field and its title makes no refurbishment claim, but our definition of new is a factory-new unit with the manufacturer's warranty, and an MDD warranty is the label's. Those cells compare a label-new MDD with a factory-new Seagate, and the row says so.
The shelf, as levels
For completeness, the cheapest terabyte each brand has in stock anywhere: MDD $20.00/TB, Seagate $16.00/TB. These are levels, not a price difference: the two cheapest listings are usually different capacities, interfaces and conditions, so subtracting them measures what each brand happens to have in stock rather than what the same drive costs. We do not turn them into a percentage.
Warranty: whose promise you get
This is the difference that matters if a drive fails, and it is larger than the price gap. A new Seagate drive carries Seagate's own warranty, attached to its serial number and honoured by Seagate. Seagate's factory recertified drives carry a six-month Seagate warranty, which Seagate states on its own pages, along with the note that its new-drive warranties do not apply to them.
Company's own words Seagate Recertified Hard Drives - model list, each with a 6-month limited warranty, Seagate Technology (support). Read 1 October 2026.
An MDD drive carries whatever its listing states, and that warranty is the seller's: of the 27 active MDD listings we hold, 9 state five years, 1 state three, and 17 state none. A five-year seller warranty can look better than a six-month manufacturer one; whether it is depends on the seller, which is why the detail is on our MDD warranty page.Provenance: what each listing says about the drive
Every listing on this site carries a provenance line: Amazon's own condition and grade, the seller, the seller's note and what the title claims. On the MDD side, 4 of the 5 in-stock MDD listings whose titles we have re-read since 1 October say "(Renewed)". On the Seagate side, 4 of the 43 in-stock used Seagate listings we have re-read make a refurbishment claim in the title. Seagate is the one maker whose own recertified part numbers we can check; MDD part numbers are the label's own, so there is nothing equivalent to check them against. The provenance line on each MDD row is on the MDD reliability page.
Reliability: not compared, and why
We have no reliability figure for MDD and print none - not a score, not a comparison, not an implication. The largest public source of drive failure rates, Backblaze's quarterly Drive Stats, reports by drive model for the drives in its own data centres; its Q2 2026 tables list models from HGST, Seagate, Toshiba and WDC, and no model under the MDD label.
Press, attributed Q2 2026 Drive Stats: Hard Drive Failure Rates (models with > 500 drives and > 100,000 lifetime drive days in the lifetime table), Backblaze. Read 1 October 2026.
That is not evidence about MDD drives either way. Backblaze buys for its own fleet and publishes only models it runs in volume; a relabelled drive has no fleet record under its label, and we cannot say which mechanism sits inside a given MDD part number, because the listings almost never say. Absence of data is the finding, and it is the reason this cluster answers the questions it can - who owns the label, whose warranty applies, what the listing actually states, what it costs - rather than the one it cannot.Backblaze does publish failure rates for many Seagate models. We do not set them against MDD here, because there is nothing on the other side to set them against, and because a fleet failure rate describes particular models in one company's data centres - not a brand, and not a used drive bought from a marketplace.
Cheaper per terabyte is real. It is also only one of three differences. Where MDD is cheaper in a matched cell, the saving is genuine. Weigh it against the other two differences - whose warranty you get, and what the listing says about the drive's history - and check the drive's health the day it arrives, whichever label is on it.
Frequently asked questions
Frequently asked questions
Is MDD cheaper than Seagate?
Sometimes. Matched like for like - same capacity, interface and condition - MDD averages +4.2% against Seagate per terabyte across 10 such matches, and is the cheaper of the two in 5. It depends heavily on capacity, so compare the cell for the drive you want.
Is MDD as good as Seagate?
No data answers that. There are no public fleet reliability statistics under the MDD label, and MDD listings rarely say which manufacturer built the drive inside. What differs measurably is whose warranty applies and what condition the listing describes.
Is an MDD drive actually a Seagate?
Sometimes the listing says so, usually it does not. MDD is a label registered to GOHARDDRIVE, INC.; of the MDD listings we read on 1 October 2026, one named the manufacturer part number it matches (a Seagate one), and the rest named none.
Which has the better warranty, MDD or Seagate?
They are different kinds of warranty. A new Seagate drive carries Seagate's own warranty, tied to its serial number. A Seagate factory recertified drive carries a six-month Seagate warranty. An MDD drive carries whatever its listing states - many state none - and that warranty is the seller's.
Why not just compare the cheapest MDD with the cheapest Seagate?
Because they are usually different products: different capacities, interfaces and conditions. That is a comparison of two shelves, not two drives. We show it, labelled as levels, but the price difference we stand behind is the matched one.
Do these prices apply outside the US?
No. We price Amazon US listings in US dollars. MDD and Seagate are both sold in other countries, at other prices.
Related: MDD: who makes them · Is MDD reliable? · MDD warranty · Mixing MDD with IronWolf · Refurbished vs recertified vs renewed