9 drives tracked from $31.50/TB. Prices updated about once a day.
20TB costs $31.50/TB right now against $24.76/TB at 4TB, today's best-value capacity - a 27% premium per terabyte. See the full value-frontier curve for the arithmetic, including when the premium is still the right buy for a fixed bay count.
| Buy | Details | ||||||
|---|---|---|---|---|---|---|---|
| $31.50 Lowest $/TB | WD Ultrastar 20TB SATA WUH722020ALE604 WUH722020ALE604 | 20TB SATA-6G | Not sourced | $630.00 | Refurb | Buy on Amazon | |
Part number:WUH722020ALE604 RPM:— Cache:— Sector:512e Workload:— DWPD:— Form factor:3.5" Series:Ultrastar HC560 ASIN:B0G31DFYZV Warranty:not stated by a source This offer, in its own words (the seller's note is verbatim): This offer: sold by Tech Original · Amazon says Used / LikeNew | |||||||
| $32.50 ~ 30d avg | MDD 20TB SATA 7200RPM NAS MD20TS25672NAS | 20TB SATA-6G | Not sourced | $649.99 | New | Buy on Amazon | |
Part number:MD20TS25672NAS RPM:7200 Cache:256MB Sector:512e Workload:550TB/yr DWPD:— Form factor:3.5" Series:MDD Enterprise ASIN:B0C3FBQNC9 Warranty:5 yr - not confirmed by a vendor document This offer, in its own words (the seller's note is verbatim): This offer: sold by goHardDrive · Amazon says New / New | |||||||
| $32.50 ~ 30d avg | MDD 20TB SATA 7200RPM NAS MD20TSATA25672NAS | 20TB SATA-6G | Not sourced | $649.99 | Refurb | Buy on Amazon | |
Part number:MD20TSATA25672NAS RPM:7200 Cache:256MB Sector:512e Workload:550TB/yr DWPD:— Form factor:3.5" Series:MDD Enterprise ASIN:B0BYTYLMZ1 Warranty:not stated by a source This offer, in its own words (the seller's note is verbatim): This offer: sold by goHardDrive · Amazon says New / New · title says Renewed | |||||||
| $40.00 ~ 30d avg | WD Red Pro 20TB WD201KFGX WD201KFGX | 20TB SATA-6G | CMR | $799.99 | Refurb | Buy on Amazon | |
Part number:WD201KFGX RPM:7200 Cache:512MB Sector:— Workload:550TB/yr DWPD:— Form factor:3.5" Series:WD Red Pro ASIN:B09TBF6GHJ Warranty:5 yr - seller claim, not the maker's This offer, in its own words (the seller's note is verbatim): This offer: sold by ALL4COMPUTERS ----- SIGNATURE REQUIRED ----- · Amazon says Used / Good · ALL4COMPUTERS ----- SIGNATURE REQUIRED -----'s note: 5 YEAR DEALER WARRANTY - 100% SATISFACTION GUARANTEED. | |||||||
| $42.25 ~ 30d avg | WD Red Pro 20TB WD202KFGX WD202KFGX | 20TB SATA-6G | CMR | $845.00 | Refurb | Buy on Amazon | |
Part number:WD202KFGX RPM:7200 Cache:512MB Sector:— Workload:550TB/yr DWPD:— Form factor:3.5" Series:WD Red Pro ASIN:B0DYQH22PW Warranty:5 yr - seller claim, not the maker's This offer, in its own words (the seller's note is verbatim): This offer: sold by Amazon Resale · Amazon says Used / LikeNew · Amazon Resale's note: No item damage observed during inspection. Item will come in original packaging. | |||||||
| $44.00 ~ 30d avg | Seagate IronWolf Pro 20TB NAS ST20000NT001 | 20TB SATA-6G | Not sourced | $879.99 | New | Buy on Amazon | |
Part number:ST20000NT001 RPM:7200 Cache:256MB Sector:512e Workload:300TB/yr DWPD:— Form factor:3.5" Series:IronWolf Pro ASIN:B0B94MF4LP This offer, in its own words (the seller's note is verbatim): This offer: sold by QuickDealStore · Amazon says New / Unknown | |||||||
| $44.61 ~ 30d avg | WD Red Pro 20TB WD202KFGX WD202KFGX | 20TB SATA-6G | CMR | $892.26 | New | Buy on Amazon | |
Part number:WD202KFGX RPM:7200 Cache:512MB Sector:— Workload:550TB/yr DWPD:— Form factor:3.5" Series:WD Red Pro ASIN:B0DYQH22PW This offer, in its own words (the seller's note is verbatim): This offer: sold by Amazon.com · Amazon says New / Unknown | |||||||
| $49.95 ~ 30d avg | WD Ultrastar 20TB SATA WUH722020CLE6L4 WUH722020CLE6L4 | 20TB SATA-6G | Not sourced | $999.00 | New | Buy on Amazon | |
Part number:WUH722020CLE6L4 RPM:— Cache:— Sector:— Workload:— DWPD:— Form factor:3.5" Series:Ultrastar ASIN:B0FF93NXLH Warranty:not stated by a source This offer, in its own words (the seller's note is verbatim): This offer: sold by WhyBlueX · Amazon says New / Unknown | |||||||
| $60.00 ~ 30d avg | WD Red Pro 20TB WD201KFGX WD201KFGX | 20TB SATA-6G | CMR | $1,199.99 | New | Buy on Amazon | |
Part number:WD201KFGX RPM:7200 Cache:512MB Sector:— Workload:550TB/yr DWPD:— Form factor:3.5" Series:WD Red Pro ASIN:B09TBF6GHJ This offer, in its own words (the seller's note is verbatim): This offer: sold by ALL4COMPUTERS ----- SIGNATURE REQUIRED ----- · Amazon says New / Unknown | |||||||
Guides for this capacity: best 20TB hard drive · the HDD price forecast · fill a NAS at today's prices
Every listing we track at this size - 19 product pages, including ones with no current offer. Out-of-stock pages carry specs and in-stock alternatives, never a stale price.
One 20TB SATA hard drive, in decimal units (1TB = 1,000GB), before file-system and RAID overhead. Each line is a division you can redo; the per-file sizes are our assumptions and say so.
Security cameras, recording continuously: 578 camera-days - 8 cameras for 72 days. The arithmetic: 3.2 Mbps ÷ 8 = 0.4 MB/s × 86,400 s = 34.56 GB per camera-day; 20,000 GB ÷ 34.56 = 578 camera-days. The bitrate is WD's reference figure for one stream (single stream, 1080p, h.265, 25fps), from WD Purple / WD Purple Pro data sheets (footnote 3); the 8-camera count is our example. A camera set to a higher bitrate fills the drive proportionally faster.
14-20TB drives are the workhorses of enterprise storage arrays. A single 4U JBOD with 60 x 20TB delivers over 1PB of raw storage.
WD Ultrastar DC HC550 (18TB) and HC560 (20TB) use ePMR technology - a CMR variant that is fully RAID compatible despite the different recording method.
Large-capacity nearline drives are ideal for AI training data lakes where sequential read throughput matters more than random IOPS.
$/TB at these capacities has been declining steadily. Wait for quarterly promotions if not urgent - prices can swing 15-20% on enterprise bulk.
9 in-stock listings out of 9 tracked; the cheapest is the WD Ultrastar 20TB SATA WUH722020ALE604 at $630.00 ($31.50/TB). The table on this page is the live ranking.
Both are in stock: 5 new and 4 recertified or used. The cheapest new is the MDD 20TB SATA 7200RPM NAS at $649.99, the cheapest recertified or used the WD Ultrastar 20TB SATA WUH722020ALE604 at $630.00 - a 3% shelf gap between two different models, not a like-for-like discount. New carries the manufacturer's warranty; recertified a reseller's.
4 of the 9 tracked listings carry a manufacturer-sourced conventional (CMR/ePMR) recording value, including the WD WD Red Pro 20TB WD201KFGX and the WD WD Red Pro 20TB WD202KFGX. 5 are not sourced either way - an unsourced drive is never assumed CMR here.
WD, MDD, Seagate - that is what has live or recently-live listings, not the manufacturers' full line-ups.
Monthly average of every listing tracked that month, new and used together. A level, not a price change: it moves when the mix of listings changes.
Get emailed when 20TB SATA drops below your target $/TB.
SATA enterprise HDDs offer the best $/TB for bulk nearline storage, backup targets and cold archive tiers.