Best 20TB External Hard Drive Deals Right Now
Every 20TB external hard drive we track, in one live table sorted by price per TB. Prices refresh from Amazon regions throughout the day, so the top row is the current best deal at this capacity. Below the table: what to check before you buy, and answers to the most common 20TB questions.
Updated July 29, 2026
Top 7 by Price per TB
See all 7 listings| # | Product | Capacity | Condition | Price / TB | Price | Region | |
|---|---|---|---|---|---|---|---|
| 1 | Avolusion M5 Series 22TB USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (Renewed) | 21.5 TB | Used | $27.93 /TB | $600.00 | us | View |
| 2 | WD 20TB Elements Desktop External Hard Drive, USB 3.0 drive for plug-and-play storage - WDBWLG0200HBK-NESN | 19.5 TB | Used | $34.15 /TB | $667.00 | us | View |
| 3 | Western Digital 22TB Elements Desktop External Hard Drive, USB 3.0 external hard drive for plug-and-play storage - WDBWLG0220HBK-NESN | 21.5 TB | New | $39.14 /TB | $841.00 | us | View |
| 4 | WD 20TB Elements Desktop External Hard Drive, USB 3.0 drive for plug-and-play storage - WDBWLG0200HBK-NESN | 19.5 TB | New | $40.96 /TB | $800.00 | us | View |
| 5 | LaCie d2 Professional 20TB External Hard Drive Desktop HDD – USB-C USB 3.1 Gen 2, 7200 RPM Enterprise Class Drives, for Mac and PC Desktop, 1mo Adobe CC All Apps Plan, Rescue Services (STHA20000800) | 19.5 TB | New | $42.50 /TB | $830.00 | us | View |
| 6 | Glyph BlackBox Pro External Hard Drive 7200 RPM, USB-C (3.1,Gen2) (20TB) | 19.5 TB | New | $46.08 /TB | $900.00 | us | View |
| 7 | LaCie 2big Dock 40TB External HDD - Thunderbolt and USB4 Compatibility, Data Recovery (STLG40000400) | 19.5 TB | New | $92.11 /TB | $1799.00 | us | View |
What to Check Before Buying a 20TB External Hard Drive
3.5-inch desktop externals need wall power but cost much less per TB. 2.5-inch portables run off USB but top out around 5TB.
Externals often contain SMR or white-label drives. If you plan to shuck the drive for a NAS, research which model is inside the enclosure first.
USB 3.0 (5 Gbps) saturates any hard drive, so USB-C vs USB-A is about convenience, not speed. Thunderbolt adds nothing for a single HDD.
Ignore it in the price comparison - free tools (or your OS) do the same job.
Frequently Asked Questions
Is a 20TB external drive good for backups?
Can I shuck a 20TB external drive and use it in a NAS?
Desktop or portable 20TB external drive - which should I buy?
Want to filter by region, warranty, or condition?
The full price table compares every drive we track across Amazon US, UK, DE, FR, CA, IT, and ES.
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