Best 18TB Hard Drive Deals Right Now
Compare 18TB Hard Drives on Amazon US by price per TB. Choose new or used, then check the model, seller and price timestamp before buying.
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10 offers by price per TB
See all 31 listingsWe found 31 recently priced 18TB Hard Drives, showing the top 10 by price per TB. Prices start at $499.99, with the lowest price per TB currently at $27.78/TB.
| # | Product | Capacity | Condition | Price / TB | Price | Region | |
|---|---|---|---|---|---|---|---|
| 1 |
Western Digital 18TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256MB Cache, 3.5" - WD180PURZ
3.5"HDD
Price checked Oct 27, 2026 18:07 UTC
|
18 TB | Used / renewed | $27.78 /TB | $499.99 | us | Amazon ↗ |
| 2 |
Western Digital DC HC550 18TB SATA 6Gb/s 7200RPM 3.5-inch Enterprise HDD - WUH721818ALE604 (0F38453) (Renewed)
3.5-inchHDD
Listed warranty: 3 months · verify seller
Price checked Oct 27, 2026 18:08 UTC
|
18 TB | Used / renewed | $29.39 /TB | $529.00 | us | Amazon ↗ |
| 3 |
Seagate Enterprise 3.5" 18000 GB 7200 RPM 18 TB 3.5" 7200 RPM SATA ST18000NM00J (Renewed)
Internal 3.5"HDD
Listed warranty: 3 months · verify seller
Price checked Oct 27, 2026 18:12 UTC
|
18 TB | Used / renewed | $30.00 /TB | $540.00 | us | Amazon ↗ |
| 4 |
MDD MAXDIGITALDATA MDD (MDD18TS25672NAS) 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5'' Internal NAS Hard Drive (Renewed)
Internal 3.5"HDD
Listed warranty: 60 months · verify seller
Price checked Oct 27, 2026 18:12 UTC
|
18 TB | Used / renewed | $30.00 /TB | $539.99 | us | Amazon ↗ |
| 5 |
Seagate Exos ST18000NM002C 18TB 7200RPM 512e SATA 6Gb/s 512MB Cache 3.5-Inch Enterprise Hard Drive (Renewed)
3.5"HDD
Price checked Oct 27, 2026 18:09 UTC
|
18 TB | Used / renewed | $30.00 /TB | $539.99 | us | Amazon ↗ |
| 6 |
Seagate Exos ST18000NM003C 18TB 7200RPM 512e SATA 6Gb/s 512MB Cache 3.5-Inch Enterprise Hard Drive (Renewed)
3.5"HDD
Price checked Oct 27, 2026 18:07 UTC
|
18 TB | Used / renewed | $30.00 /TB | $539.99 | us | Amazon ↗ |
| 7 |
MDD (MDD18TS25672CCTV) 18TB 7200RPM 256MB Cache SATA 6.0Gb/s 3.5inch Internal Surveillance Hard Drive - 3 Years Warranty (Renewed)
Internal 3.5"HDD
Listed warranty: 36 months · verify seller
Price checked Oct 27, 2026 18:12 UTC
|
18 TB | Used / renewed | $30.55 /TB | $549.99 | us | Amazon ↗ |
| 8 |
Seagate Exos X18 ST18000NM000J 18 TB Hard Drive - Internal - SATA (SATA/600) (Renewed)
Internal 3.5"HDD
Listed warranty: 3 months · verify seller
ST18000NM000J specifications →
Price checked Oct 27, 2026 18:12 UTC
|
18 TB | Used / renewed | $30.55 /TB | $549.99 | us | Amazon ↗ |
| 9 |
Western Digital Ultrastar DC HC550 WUH721818ALE601 0F38452 18TB 7200 RPM SATA 6Gb/s 512e 512MB Cache Power Disable 3.5in Enterprise Hard Drive (Renewed)
Check form factorHDD
Price checked Oct 27, 2026 18:09 UTC
|
18 TB | Used / renewed | $31.06 /TB | $559.00 | us | Amazon ↗ |
| 10 |
Western Digital Ultrastar DC HC550 18TB 7200RPM 3.5" SATA Hard Drive WUH721818ALE6L4 (Renewed)
3.5-inchHDD
Listed warranty: 3 months · verify seller
WUH721818ALE6L4 specifications →
Price checked Oct 27, 2026 18:08 UTC
|
18 TB | Used / renewed | $31.61 /TB | $569.00 | us | Amazon ↗ |
What to Check Before Buying a 18TB Hard Drive
Check CMR or SMR for the exact model. For a NAS or sustained writes, start with your enclosure's compatibility list and workload requirements.
A manufacturer's specification describes an eligible new drive. OEM, bulk and renewed offers may have different seller or manufacturer coverage.
Confirm SATA versus SAS, drive dimensions, supported bays and the model-specific workload rating before buying.
Account for formatting, redundancy and free space. A mirror uses two drives to provide approximately one drive's capacity; it does not replace an independent backup.
Frequently Asked Questions
Is 18TB enough for my NAS?
Should I buy a new or used 18TB hard drive?
What is a good price per TB for a 18TB hard drive?
Sources and further reading
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