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Seagate

Seagate Expansion 20TB Portable HDD

Seagate Expansion 20TB Portable HDD
seagate-expansion20TBUSB 3.0Portable-External
$36.50/TB
$729.99
newIn Stock
This offer: sold by WEDNET LLC ยท Amazon says New / Unknown
Price updated
Price accurate as of Nov 3, 2026, 02:49 AM
Buy on Amazon

The Seagate Expansion 20TB Portable HDD is a 20TB USB 3.0 External-HDD in new condition. It is in stock at $729.99 - $36.50/TB.

Model context

Part of the Seagate line we track.

Quick Verdict

The Seagate Expansion 20TB Portable HDD is a 20TB USB 3.0 enterprise drive at $36.50/TB - Verify recording technology before use in RAID. New unit with full manufacturer warranty.

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Specifications

Capacity20TB
Form FactorPortable-External
InterfaceUSB 3.0
Recording Techโ€”
Sector Sizeโ€”
Workload Ratingโ€”
Warrantyโ€”
ASINB0B2PZWD81
Market context

Against every other drive we have an in-stock price for today, this one is cheaper per tb than 87% of them (54 of 62). The cheapest we can currently buy is $28.33/TB; the middle of the market is $48.64/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 โ†’Cheapest per terabyte, all categories โ†’

Also appears in

External drives
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Frequently Asked Questions

Yes. At our last check it was $729.99 ($36.50 per terabyte at its 20TB capacity), sold new under ASIN B0B2PZWD81. Amazon sets the final price at checkout.

This listing (Seagate Expansion 20TB Portable HDD, ASIN B0B2PZWD81) carries no renewed, recertified, refurbished or pulled claim in its title, and Amazon reports it as new. On this site that is what "new" means: sold as factory-new.

Use Case Scenarios

๐Ÿ 
Home & SMB NAS
Building a high-capacity NAS for media, backups and file sharing.
โœ“ Excellent fit
Verify CMR recording before using in RAID. New drives come with full warranty.
๐Ÿ’พ
Backup Server / Veeam Target
Dedicated backup storage for Veeam, Commvault, or NetBackup.
โœ“ Excellent fit
20TB SATA drives are ideal for backup targets. SATA gives maximum $/TB for backup repositories.
โ˜๏ธ
Object Storage / Cold Data Tier
High-density storage for MinIO, Ceph or Hadoop at scale.
โœ“ Excellent fit
At 20TB per drive, a 60-bay JBOD delivers 1200TB raw โ€” 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. Establishes baseline for future comparison.
MonthlyRun SMART short self-test
smartctl -t short /dev/sdX โ€” takes 1-2 minutes, catches most developing issues. Schedule during off-peak.
QuarterlyRun SMART long self-test
smartctl -t long /dev/sdX โ€” 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.