Seagate · NAS hard drive buying guide
Seagate IronWolf Pro 20TB · Exact identity: ST20000NT001
20TB decimal capacity · CMR · SATA 6 Gb/s
Catalog amount: $719.99 · unverified · Price record: 2026-09-17. Tax and shipping excluded.
Latest prices could not be retrieved. Showing a dated backup; recheck the store.
IronWolf Pro 20TB: specifications and dated store comparison →20 TB per bay for a growing shared-storage array
One 20 TB ST20000NT001 drive · 3.5-inch SATA · CMR · 7200 RPM
This guide combines Seagate DS2129.4 with three laboratory ST20000NT001 tests (NASCompares, BenchLife, Hardwareluxx) and one owner Grafana log (zubilitic) of an exact ST20000NT001-3MB101. The owner log is a RAIDZ1 migration and enclosure temperature story, not a CrystalDiskMark peak. StorageReview and Tom's Hardware 20TB Pro articles remain the older NE / 300 TB/year class. ChooseCompute has not tested this drive. See the review evidence ↓
CMR recording and the annual workload class suit always-on NAS storage.[1]
20 TB per bay provides substantial raw capacity; usable space depends on redundancy.[1]
Enclosure vibration and seek noise need separate consideration; no room-noise guarantee follows from the specification.[1][2]
A 7200 RPM mechanical drive has rotational delay; capacity-focused NAS storage is its main role.[2]
Follow any specification for its full conditions and sources.
Living with it
A pair of 20 TB drives in a simple mirror provides roughly 20 TB before formatting and filesystem overhead. Four equal drives with one drive of parity provide roughly 60 TB before overhead. These are capacity calculations, not measurements; snapshots and reserved space reduce what remains.[1]
The 550 TB/year workload class, RV sensors and RAID-oriented error recovery suit frequent shared storage use. They do not make a single drive redundant or make an unsupported NAS configuration approved.[1]
The original tests support useful bulk-transfer performance, but results vary with workload and setup. BenchLife found the older NE revision ahead in some sequential tests, while Hardwareluxx showed similar results across two NT samples. NASCompares adds a mixed-file copy example. The Pro workload rating is a clearer reason to choose this revision than a promise that it wins every benchmark.[3][4][5]
The 285 MB/s outer-track rating describes the drive under manufacturer conditions. Network speed, parity, small files and the NAS processor can all limit transfers. Buy the capacity and workload class you need; do not equate SATA link speed with file-copy speed.[1]
The exact-model datasheet and the later shared manual disagree on cache, some performance figures and operating limits. The tables preserve both contexts. If an exact cache size or thermal/acoustic limit decides your purchase, ask the seller or Seagate to confirm the revision supplied.[1][2]
StorageReview's RAID6 article and Tom's Hardware's 20TB Pro review describe the 300 TB/year IronWolf Pro, not ST20000NT001. They are useful for array-level 20TB CMR behavior and for seeing why Seagate raised the NT workload rating to 550 TB/year. BenchLife's side-by-side is the article that actually retested NE and NT on the same 2023 platform: NT did not win every sequential test.[11][12][4][1]
zubilitic bought ST20000NT001 in early June and published Grafana for that serial. In a USB Thermaltake Silver River 3 the drive ran about 45–51 °C; after moving to an Icy Box IB-3805-C31 with extra airflow it hovered near 41 °C. Ambient was not controlled. The 163 MB/s Grafana write peak is the RAIDZ1-to-single-disk copy with compression and parity, not the 285 MB/s datasheet OD figure. Do not treat a separate 265.28 MB/s ASMT 2135 / Apple M1 overlay as the same test.[14][1]
Our buying advice combines official specifications with the original reviews below. We have not tested this product ourselves. Expand a review for its setup, measurements and limitations.
Rob AndrewsFeb 13, 2023
NASCompares reported 174 MB/s average and 239 MB/s peak for 22.8GB across 2,310 files on an i5-11400 Windows 10 Pro PC through a Sabrent USB 3.2 Gen 2 dock. These are the reported transfer-display values, not a rate recalculated from elapsed time or a RAID-array result.
Read the original reviewSeagate 20TB Ironwolf Pro ST20000NT001 HDD Review – NT Version
Tested: Single ST20000NT001; Windows 10 Pro, i5-11400, 16 GB DDR4-2666, B560M, Sabrent USB3.2 Gen 2 dock. Separate NAS checks: DS923+ and TS-464.
Applies to: Exact 20 TB NT revision; historical hardware/software conditions.
| Measurement | Result | Conditions & source location |
|---|---|---|
| Reported Windows copy speed | 174 MB/s average; 239 MB/s peak | 22.8 GB/2310 mixed files; author-reported transfer display, not throughput recalculated from total elapsed time. The stated22.8GB and2:44 duration do not directly reproduce174MB/s; retain it as author-reported, not independently verified elapsed-time throughput.Testing; text also reports 02: 44 elapsed |
| CDM8.0.4 sequential Q8T1 read/write | 275.35 / 265.14 MB/s | One1GiB pass, empty18627GiB volume, USB dock;70% read/30% write mixed column separately218.28MB/s.Original1GB screenshot |
| CDM8.0.4 sequential Q8T1 read/write, larger dataset | 276.16 / 269.25 MB/s | One4GiB pass, same empty USB-connected drive;4KQ32T16 read/write2.89/2.86MB/s.64MiB cache-sensitive84.39MB/s random-read result is not adopted as sustained platter performance.Original4GB and64MB screenshots |
Limits to keep in mind
bishengMar 27, 2023
On an i9-12900K/Z790 Windows 11 Pro PC, BenchLife measured NT ATTO maxima of 267.01 MB/s read at QD16 and 262.83 MB/s write at QD1. The older NE drive led some sequential tests; NT improved some 4K-write results. Seagate supplied the NT sample.
Read the original review企業級機種般的高規格設定，Seagate IronWolf Pro 20TB 新舊版實測比較
Tested: ST20000NT001 and ST20000NE000 retested on i9-12900K, ASUS Z790-E, 32 GB DDR5-4800, Windows 11 Pro 22H2. Original HD Tune screenshots identify ST20000NT001-3LT101; OS drive Plextor M9PG Plus1TB.
Applies to: Exact target NT drive; comparator results remain separate.
| Measurement | Result | Conditions & source location |
|---|---|---|
| NT ATTO maximum read / write | 267.01 / 262.83 MB/s | Read at QD16; write at QD1, as identified in article text.Paragraph after test-platform list |
| CDM sequential Q8T1 read/write | 272.77 / 264.96 MB/s | Same-platform NT/NE comparison; NE288.93/278.72MB/s. Test-file size and CDM version not shown in comparison chart.Benchmark6 original chart |
| HD Tune Pro5.75 full-surface read/write averages | 215.9 / 216.6 MB/s | One pass over20TB; read min/max108.1/275.1MB/s, write125.6/277.2MB/s. Screens show35°C read and31°C write; no controlled ambient or thermal protocol.Benchmark9 and8 original screenshots |
| PCMark10 data-drive score/bandwidth | 974 points / 150.36 MB/s | NE comparator940points/145.15MB/s. Full-system workload instead slightly favors NE: NT339points58.34MB/s, NE346points59.46MB/s. Trace workloads, not file-copy speeds.Benchmark17 and18 original charts |
Limits to keep in mind
Johannes StinglFeb 12, 2023
Hardwareluxx compared two NT samples on a Ryzen 5-2400G/B350 Windows 10 PC. Its first sample drew 29.73W at startup, 3.15W at idle and 12.34W during random reads, measured across both supply rails. The samples performed closely; two supplied units cannot establish fleet reliability.
Read the original reviewSeagate IronWolf Pro Refresh im Test Gutes wird noch besser - Vergleich mit dem zweiten Muster
Tested: Two ST20000NT001 samples; empty drives on B350 SATAIII, Ryzen 5-2400G, 16 GB DDR4-3000, Windows 10 Home 1809; separate 5V/12V power measurement. Power sampled about1minute per repeated test; idle after10minutes untouched; copy uses50GB of repeated Windows1809 images; random load is HD Tune Pro Random Access Read. Acoustics measured without drive decoupling in a fixed non-anechoic location.
Applies to: Exact-model two-sample comparison; not a fleet study.
| Measurement | Result | Conditions & source location |
|---|---|---|
| Startup / idle / random-read power | 29.73 / 3.15 / 12.34 W | First sample; source measures both supply rails with the Rigol/Pico setup described on page 3.Page 6 power charts; first ST20000NT001 series |
| Copy power, first/second sample | 6.92 / 7.14 W | Combined supply rails during50GB copy; second sample startup30.98W, idle2.93W, random-read12.34W.Pages3 and6 power charts |
| Two-sample CDM6 sequential read/write | 274.7/270.9 and268.4/267.4 MB/s | Empty drives on disclosed B350 SATA platform; two samples, not population performance statistics.Page6 comparison |
| Reported RAR sound average/peak, two samples | 25.2/28.1 and25.8/28.7 dBA | All below meter stated30dBA lower measurement range. Author says displayed values down to20dBA plausible but graph cannot show them. Distance/background unreported; these values cannot establish calibrated sound-pressure ranking.Pages4 and6 acoustic method/charts |
Limits to keep in mind
zubiliticSep 3, 2025
A self-bought ST20000NT001-3MB101 ran about 45–51 °C in a USB Thermaltake single bay (Grafana tooltip 51 °C) and around 41 °C after moving into an Icy Box with a rear fan. A RAIDZ1 copy from four 4TB disks onto this 20TB disk peaked at 163 MB/s write in Grafana; that path includes compression and parity, so it is not a maximum sequential rating. A 265 MB/s Mac overlay on the same frame is a different, unidentified path.
Read the original review20TB Seagate IronWolf Pro - Real Tests, Noise, Heat & Exos Comparison
Tested: Self-bought ST20000NT001 (early June). Temporary Thermaltake Silver River 3 USB 3 enclosure, then Icy Box IB-3805-C31 with rear fan. Grafana/Prometheus on Linux. Migration from four 4TB disks in ZFS RAIDZ1 onto the 20TB disk with compression/parity. Ambient not controlled.
Applies to: Exact ST20000NT001-3MB101 identity on the 6:32 Grafana tooltip. Thermal and migration figures are this owner's enclosure path, not a single-drive CrystalDiskMark or NAS Ethernet test.
| Measurement | Result | Conditions & source location |
|---|---|---|
| Grafana tooltip temperature | 51 °C | ST20000NT001-3MB101 in Thermaltake single enclosure; tooltip 2025-06-08 13:00:00. Top of frame slightly clipped.6:32 frame |
| RAIDZ1 migration write peak (Grafana) | 163 MB/s | Write onto the 20TB disk while reading four 4TB RAIDZ1 members; compression/parity in path.8:46 Grafana series labeled 163 MB/s |
Limits to keep in mind
Before you buy
The visible Newegg primary pane on the saved 2026-09-11 page is E.O.L. Tech Inc. at $825.10 in stock (new). A separate Newegg-sold alternative is $669.99 out of stock. Older B&H/Adorama/Amazon rows keep their original dates.[10][13]
Multiply the dated per-drive price by the number of drives you need, then allow for backup storage, a replacement plan and any network upgrade. Compare usable capacity after redundancy rather than adding raw TB alone.[1]
The datasheet lists 5.7 W average idle and 7.7 W average operating power per drive. Actual energy depends on workload, sleep settings and background tasks; include the NAS enclosure itself separately.[1][2]
Check ST20000NT001, 20 TB, one-drive quantity, new condition and the actual seller before paying. A standard retail listing can also display separate used offers or a different default marketplace seller.[1]
One 20 TB ST20000NT001 drive · 3.5-inch SATA · CMR · 7200 RPM Check the total delivered price at the store.
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One 20TB 3.5-inch SATA HDD
Shipping cost, US destination eligibility, import status and tax require checkout verification. Current page observation only. Recheck exact MPN/variant, seller, stock, hidden or changed price, regional warranty, shipping and tax before ordering.
Observed Sep 10, 2026[9]
View exact product at AmazonPrices are dated observations. Confirm the model, seller, condition, stock and delivered total at the store. Older prices remain visible as history. Links may earn a commission.
Yes. Seagate lists ST20000NT001 as CMR in its model-specific datasheet column.[1]
No. The drive is designed for NAS use, but controller support, maximum capacity and vendor firmware qualification still matter. Check the exact enclosure and drive model together.[1][2]
No. It is an annualized transfer workload that includes reads and writes. It is not an SSD-style lifetime TBW figure.[1][2]
Research updated Sep 11, 2026. Individual source check dates are listed below. Measurements belong to the named reviewers; tested configurations and software versions may differ from the product you buy.
Checked Sep 11, 2026 · DS2129.4-2311US p.2 ST20000NT001 column: 256 MB cache, 285 MB/s OD, 550 TB/year, 5.7 W idle, 7.7 W operating, 20/26 dBA.
Checked Sep 11, 2026 · Cover models ST24000NT002 / ST20000NT001 / ST16000NT001 / ST12000NT001; specification summary tables pp. 7–12 and acoustics/power notes. Shared rows are not per-column.
Checked Sep 11, 2026 · Live URL HTTP 403 on 2026-09-11; facts reread from 2024 Wayback snapshot of the same article
Checked Sep 11, 2026 · NT vs NE 20TB comparison; ATTO NT 267.01/262.83 MB/s; platform i9-12900K / Z790 / Windows 11 22H2
Checked Sep 11, 2026 · NT 20TB two-sample lab; page 6 power/benchmarks; start=5 measurements retained
Checked Sep 8, 2026 · Product heading / MFR, selected capacity and quantity; primary purchase area and seller disclosure. Exact MFR and single-drive offer; Temporarily Out of Stock. Display price does not establish current purchase availability.
Checked Sep 8, 2026 · Product heading / MFR, selected capacity and quantity; primary purchase area and seller disclosure. Primary Add to cart seller PC Parts Hub; alternate seller prices are not substituted.
Checked Sep 8, 2026 · MFR ST20000NT001, selected 20TB / Single at $799.99; limited-quantity Buy Now banner.
Checked Sep 10, 2026 · Exact MPN in title; selected new main buy box provides Add to cart and shows seller QuickDealStore; ships from Amazon; numeric price is hidden behind cart.
Checked Sep 10, 2026 · Exact MPN in H1; selected main offer shows Add to cart, seller E.O.L. Tech Inc,., and a visible price of $825.10.
Checked Sep 11, 2026 · Newegg item 22-185-071 FinalPrice 669.99 Instock false; marketplace 9SIAAEEKG95648 825.10 Instock true
Checked Sep 11, 2026 · ASR 0:00–10:19; Grafana 6:32 ST20000NT001-3MB101 51°C; 8:46 RAIDZ1 write 163 MB/s vs overlay 265.28 MB/s
Checked Sep 27, 2026 · Captured observation; sha256:46dcc50b7ce3bf196b29b810517d8b6a42cd75c411ad6ebea949380a635605ac
Checked Oct 9, 2026 · newegg-main-item; sha256:2df4bd9f26f29e16c6ffe45254fc73b745152f72512b1c2b1a7a2439376764b5
Checked Sep 27, 2026 · Captured observation; sha256:3c465c0ed788d9b992cba1250dcc5cad5f81ee0cc19fa95bf5ca8c818a55cff4
Checked Sep 27, 2026 · Captured observation; sha256:27023245eda0dd9d0e36559c7d98981911181d11ff8489fe4e1d8b371f9530b8
Checked Sep 27, 2026 · Captured observation; sha256:5e1f038aa979eec52bb4f39b5e94573172b93e91ef7453ce0d85d2c1947aeedf
Independent review completed for the scope recorded in the audit.
Source evidence and review history (JSON)