DatacenterDisk

Seagate 18TB SATA Enterprise HDD - Prices

2 drives tracked. From $24.94/TB. Updated every 4 hours.

Buy or Skip?
✓ Buy if: you want 20% below-average pricing on 18TB Seagate drives. These are datacenter pulls - verify SMART data on arrival.
✗ Skip if: you require new-only drives for production RAID or need guaranteed OEM warranty - consider new alternatives.
Buy on Amazon → $449.00
Best $/TB
$24.94
Drives
2
Condition
New + Refurb

At $24.94/TB, Seagate 18TB SATA drives are $0.53/TB above the 18TB SATA category average of $24.41/TB.

Seagate 18TB SATA - worth it?

Seagate 18TB SATA drives span the Exos X enterprise line and IronWolf Pro NAS series, both CMR and RAID-safe. Starting at $24.94/TB.

$/TB ▲Brand / ModelCapInterfaceTechCacheSectorWtyPriceCond.90DBuy
👑$24.94
↓ Good
Seagate
Exos X20 18TB SATA
ST18000NM003D
Refurb · 5yr
18TB
SATA-6G
7,200 RPM
ePMR256MB512e5yr$449.00REFURB▼Buy →Details▼
$37.50
↑ High
Seagate
Exos X20 18TB SATA
ST18000NM003D
5yr
18TB
SATA-6G
7,200 RPM
ePMR256MB512e5yr$675.00new▼Buy →Details▼

Drive Specifications

Seagate Exos X20 18TB SATA
ST18000NM003D
REFURB
$24.94/TB
$449.00 total
Capacity
18TB
Interface
SATA-6G
Form Factor
3.5"
Recording
ePMR
RPM
7,200
Cache
256MB
Sector Size
512e
Workload
550TB/yr
Warranty
5 years
Seagate Exos X20 18TB SATA
ST18000NM003D
$37.50/TB
$675.00 total
Capacity
18TB
Interface
SATA-6G
Form Factor
3.5"
Recording
ePMR
RPM
7,200
Cache
256MB
Sector Size
512e
Workload
550TB/yr
Warranty
5 years

Other Seagate SATA capacities

4TB6TB8TB10TB12TB16TB18TB20TB22TB24TB30TB32TB

Other brands at 18TB SATA

MDDSeagateToshibaWD

Frequently Asked Questions

Seagate Exos and IronWolf Pro use CMR. Standard Barracuda may use SMR at some capacities. All enterprise drives on this page are CMR and RAID-safe.

Seagate 18TB SATA drives are compatible with all major NAS platforms including Synology DiskStation, QNAP, TrueNAS, UnRAID, and any server with SATA ports. Check your NAS manufacturer's compatibility list for confirmed models.

Both are available. New drives carry full manufacturer warranty. Refurbished units are datacenter pulls with low hours - excellent value for secondary storage and backup targets.

Use Case Scenarios

🏠
Home & SMB NAS
Building a high-capacity NAS for media, backups and file sharing.
✓ Excellent fit
CMR recording is RAID-safe and fully compatible with Synology, QNAP, TrueNAS and UnRAID. Refurb units offer strong value for non-critical NAS.
💾
Backup Server / Veeam Target
Dedicated backup storage for Veeam, Commvault, or NetBackup.
✓ Excellent fit
18TB SATA drives are ideal for backup targets. SATA gives maximum $/TB for backup repositories.
☁️
Object Storage / Cold Data Tier
High-density storage for MinIO, Ceph or Hadoop at scale.
✓ Excellent fit
At 18TB per drive, a 60-bay JBOD delivers 1080TB raw — enough for petabyte-scale object storage.

Maintenance & Troubleshooting

Maintenance Checklist

On installCheck SMART baseline on arrival
Run smartctl -a /dev/sdX and record: Reallocated_Sector_Ct, Power_On_Hours, Spin_Retry_Count. Critical for refurb drives — refuse any with reallocated sectors > 0.
MonthlyRun SMART short self-test
smartctl -t short /dev/sdX — takes 1-2 minutes, catches most developing issues. Schedule during off-peak.
QuarterlyRun SMART long self-test
smartctl -t long /dev/sdX — full surface scan, takes 9 hours for 18TB. Any test failure is grounds for immediate replacement.
QuarterlyCheck RAID array health
Verify no degraded drives. A degraded array with no hot spare is one failure from data loss. Check mdstat or controller UI.
AnnuallyVerify drive firmware version
Check Seagate support site for firmware updates. Some versions have known bugs affecting integrity.
Every 3-5 yearsPlan proactive replacement
Enterprise HDDs have higher failure rates after year 4-5. At 18TB per drive, budget for replacements before failures occur.

Troubleshooting Guide

Cause: Loose SATA data or power cable, failed port, or drive not spinning up.
Fix: Reseat both cables. Try a different port. Listen for spin-up sound. Test with a known-good cable.