DatacenterDisk
Seagate

Seagate Exos X20 20TB

ST20000NM007D
Exos X20CMR20TBSATA-6G3.5"
$33.50/TB
$669.99
REFURBIn Stock
Price updated
Price accurate as of Aug 14, 2026, 06:01 PM
Buy on Amazon →
Quick Verdict

The Seagate Exos X20 20TB is a 20TB SATA-6G enterprise drive at $33.50/TB - CMR recording makes it safe for all RAID levels and NAS deployments. As a refurbished unit, run SMART diagnostics on arrival and verify power-on hours.

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Specifications

Capacity20TB
Form Factor3.5"
InterfaceSATA-6G
Recording TechCMR
RPM7200
Cache—
Sector Size—
Workload Rating—
Warranty5 years
ASINB0DFZ573X3
Market context

Against every other drive we have an in-stock price for today, this one is cheaper per tb than 62% of them (163 of 263). The cheapest we can currently buy is $14.00/TB; the middle of the market is $37.62/TB.

Where the wider market has moved

These are third-party figures about the retail market as a whole, quoted and dated. They are not our own measurements and they do not describe this specific drive.

Compare against every 20TB drive we track →Cheapest per terabyte, all categories →Category price trends →
How it compares - 20TB SATA-6G
#1WD Ultrastar DC 20TB Renewed
$16.40/TB
#2WD Ultrastar DC HC570 20TB SATA
$23.50/TB
#3MDD 20TB SATA 7200RPM NAS
$31.00/TB
#4MDD 20TB SATA 7200RPM NAS
$31.00/TB
#5WD Ultrastar 20TB SATA
$31.00/TB

Compare to similar 20TB SATA-6G drives

WD
Ultrastar DC 20TB Renewed
$16.40/TB
$327.99
REFURB
WD
Ultrastar DC HC570 20TB SATA
$23.50/TB
$469.99
new
MDD
20TB SATA 7200RPM NAS
$31.00/TB
$619.99
new
MDD
20TB SATA 7200RPM NAS
$31.00/TB
$619.99
REFURB
WD
Ultrastar 20TB SATA
$31.00/TB
$619.99
REFURB

Frequently Asked Questions

Yes. The Exos X20 20TB uses CMR recording which is fully compatible with all RAID levels.

5-year manufacturer warranty. This listing is a refurbished/renewed unit - verify seller warranty before purchase.

Compatible with any server, NAS or workstation with a SATA port. Works in Synology, QNAP, TrueNAS, UnRAID and all major NAS platforms.

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
20TB 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 20TB per drive, a 60-bay JBOD delivers 1200TB 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 10 hours for 20TB. 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 20TB 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.