Seagate EXOS x20 18TB

Enterprise HDD

Part number ST18000NM003D · EXOS x20 series · SATA 6Gb/s (SATA III). If your machine is listed below, this drive is officially supported — not a forum workaround.

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121

Compatible NAS models

0 Syn · 113 QNAP · 8 Asus · 0 TM

By vendor

18 TB

Listed capacity

Seagate

Manufacturer

3-2-1 cold backup fit

No series-level recording rating is on file for this part number yet — check the exact model for CMR vs SMR before buying it as a large cold copy (SMR is the one trait that makes a 16 TB+ backup copy painfully slow). The 3-2-1 guide and the backup tools encyclopedia cover what to schedule it with.

Compatibility verdict

It appears on the official compatibility lists of 121 machines and series — 113 QNAP, 8 Asustor. This is a Enterprise-class drive: rated for heavier sustained workloads than desktop drives. It is a strong pick for a NAS running 24/7, large-array rebuilds or camera workloads, and enterprise lines are also the drives most widely listed across all five vendors' HCLs. No series-level recording rating is on file for this part number yet, so check CMR vs SMR on the exact model before buying for an array.

Compatible NAS models

QNAP GM-1000 See its full HCL → QNAP HS-264 See its full HCL → QNAP TL-D1600S See its full HCL → QNAP TL-D400S See its full HCL → QNAP TL-D800C See its full HCL → QNAP TL-D800S See its full HCL → QNAP TL-R1200C-RP See its full HCL → QNAP TL-R1200PES-RP See its full HCL → QNAP TL-R1200S-RP See its full HCL → QNAP TL-R1210TC4-RP See its full HCL → QNAP TL-R1220Sep-RP See its full HCL → QNAP TL-R1600PES-RP See its full HCL → QNAP TL-R1620Sep-RP See its full HCL → QNAP TL-R2400PES-RP See its full HCL → QNAP TL-R400S See its full HCL → QNAP TR-002 See its full HCL → QNAP TR-004 See its full HCL → QNAP TR-004U See its full HCL → QNAP TS-1232PXU-RP See its full HCL → QNAP TS-1264U-RP See its full HCL → QNAP TS-1273AU-RP See its full HCL → QNAP TS-1277XU-RP See its full HCL → QNAP TS-1283XU-RP See its full HCL → QNAP TS-133 See its full HCL → QNAP TS-1655 See its full HCL → QNAP TS-1673AU-RP See its full HCL → QNAP TS-1677XU-RP See its full HCL → QNAP TS-1683XU-RP See its full HCL → QNAP TS-216G See its full HCL → QNAP TS-233 See its full HCL → QNAP TS-2483XU-RP See its full HCL → QNAP TS-253E See its full HCL → QNAP TS-262 See its full HCL → QNAP TS-264 See its full HCL → QNAP TS-364 See its full HCL → QNAP TS-431X3 See its full HCL → QNAP TS-431XeU See its full HCL → QNAP TS-432PXU See its full HCL → QNAP TS-432PXU-RP See its full HCL → QNAP TS-432X See its full HCL → QNAP TS-433 See its full HCL → QNAP TS-435XeU See its full HCL → QNAP TS-453E See its full HCL → QNAP TS-462 See its full HCL → QNAP TS-464 See its full HCL → QNAP TS-464U See its full HCL → QNAP TS-464U-RP See its full HCL → QNAP TS-464eU See its full HCL → QNAP TS-473A See its full HCL → QNAP TS-632X See its full HCL → QNAP TS-664 See its full HCL → QNAP TS-673A See its full HCL → QNAP TS-832PX See its full HCL → QNAP TS-832PXU See its full HCL → QNAP TS-832PXU-RP See its full HCL → QNAP TS-855X See its full HCL → QNAP TS-855eU See its full HCL → QNAP TS-855eU-RP See its full HCL → QNAP TS-864eU See its full HCL → QNAP TS-864eU-RP See its full HCL → QNAP TS-873A See its full HCL → QNAP TS-873AU See its full HCL → QNAP TS-873AU-RP See its full HCL → QNAP TS-873AeU See its full HCL → QNAP TS-873AeU-RP See its full HCL → QNAP TS-877XU See its full HCL → QNAP TS-877XU-RP See its full HCL → QNAP TS-883XU See its full HCL → QNAP TS-883XU-RP See its full HCL → QNAP TS-977XU See its full HCL → QNAP TS-977XU-RP See its full HCL → QNAP TS-983XU See its full HCL → QNAP TS-983XU-RP See its full HCL → QNAP TS-AI642 See its full HCL → QNAP TS-h1065eU See its full HCL → QNAP TS-h1065eU-RP See its full HCL → QNAP TS-h1277AXU-RP See its full HCL → QNAP TS-h1277XU-RP See its full HCL → QNAP TS-h1283XU-RP See its full HCL → QNAP TS-h1677AXU-RP See its full HCL → QNAP TS-h1677XU-RP See its full HCL → QNAP TS-h1683XU-RP See its full HCL → QNAP TS-h1886XU-RP R2 See its full HCL → QNAP TS-h1887XU-RP See its full HCL → QNAP TS-h2287XU-RP See its full HCL → QNAP TS-h2477AXU-RP See its full HCL → QNAP TS-h2477XU-RP See its full HCL → QNAP TS-h2483XU-RP See its full HCL → QNAP TS-h3087XU-RP See its full HCL → QNAP TS-h665 See its full HCL → QNAP TS-h665U See its full HCL → QNAP TS-h765eU See its full HCL → QNAP TS-h865 See its full HCL → QNAP TS-h886 See its full HCL → QNAP TS-h973AX See its full HCL → QNAP TS-h977XU-RP See its full HCL → QNAP TS-h987XU-RP See its full HCL → QNAP TVS-1272XU-RP See its full HCL → QNAP TVS-1672XU-RP See its full HCL → QNAP TVS-2472XU-RP See its full HCL → QNAP TVS-472XT See its full HCL → QNAP TVS-672XT See its full HCL → QNAP TVS-872XT See its full HCL → QNAP TVS-872XU See its full HCL → QNAP TVS-872XU-RP See its full HCL → QNAP TVS-h1288X See its full HCL → QNAP TVS-h1688X See its full HCL → QNAP TVS-h474 See its full HCL → QNAP TVS-h674 See its full HCL → QNAP TVS-h674T See its full HCL → QNAP TVS-h874 See its full HCL → QNAP TVS-h874T See its full HCL → QNAP TVS-h874X See its full HCL → Asustor AS 33 See its full HCL → Asustor AS 52/53 See its full HCL → Asustor AS 65 See its full HCL → Asustor AS 65R See its full HCL → Asustor AS 66 See its full HCL → Asustor AS 67 See its full HCL → Asustor AS 71 See its full HCL → Asustor AS 71R See its full HCL →

Same-capacity alternatives

Other drives listed at 18 TB capacity, ranked by how many machines list them:

Seagate ST18000NM000J 211 machines · EXOS x18 Seagate ST18000NE000-2YY101 194 machines · IronWolf Pro Seagate ST18000NT001-3LU101 192 machines · IronWolf Pro Western Digital WUH721818ALE6L4 165 machines · Ultrastar DC HC550 Western Digital WUH721818ALE6L0 162 machines · Ultrastar DC HC550 Western Digital WD181KRYZ 160 machines · Gold Western Digital WD181VRYZ 148 machines · Gold Toshiba MG11ACA18TE 145 machines · MG11 Series

Quick answers

Is the ST18000NM003D officially compatible with my NAS?

It appears on the official compatibility lists of 121 machines and series — 113 QNAP, 8 Asustor. Every machine page linked below shows the vendor's own list entry, refreshed daily.

Is the ST18000NM003D a good NAS drive?

This is a Enterprise-class drive: rated for heavier sustained workloads than desktop drives. It is a strong pick for a NAS running 24/7, large-array rebuilds or camera workloads, and enterprise lines are also the drives most widely listed across all five vendors' HCLs. No series-level recording rating is on file for this part number yet, so check CMR vs SMR on the exact model before buying for an array.

Can I use the ST18000NM003D for a 3-2-1 cold backup copy?

No series-level recording rating is on file for this part number yet — check the exact model for CMR vs SMR before buying it as a large cold copy (SMR is the one trait that makes a 16 TB+ backup copy painfully slow). The 3-2-1 guide and the backup tools encyclopedia cover what to schedule it with.

What are alternatives to the ST18000NM003D?

At the same capacity, the most widely listed alternatives are Seagate ST18000NM000J (211 machines), Seagate ST18000NE000-2YY101 (194 machines), Seagate ST18000NT001-3LU101 (192 machines). The full ranked list is below.