The Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) costs $0.0358/GB while the LaCie 2big Dock 20TB USB 3.2 Gen 2 External Hard Drive Black costs $0.0668/GB. Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) offers 46% better value per gigabyte as of August 2026. Both products are available on BuyPerUnit with prices from Amazon, Best Buy, and Newegg.
Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) vs LaCie 2big Dock 20TB USB 3.2 Gen 2 External Hard Drive Black — Which Is Better Value?
Prices refresh twice daily; the final price appears at the retailer's checkout. We may earn a commission from retailer links, at no cost to you; it never affects rankings.
Specification Comparison
| Spec | Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) | LaCie 2big Dock 20TB USB 3.2 Gen 2 External Hard Drive Black |
|---|---|---|
| Brand | Seagate | LaCie |
| Capacity | 18TB | 20TB |
| $/GB | $0.0358 | $0.0668 |
| Price | $645.00 | $1335.66 |
| Retailer | Newegg | Newegg |
| Category | Hard Drives (HDD) | Hard Drives (HDD) |
| Subcategory | hdd | hdd |
Price Across Retailers
Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D)
Which Should You Buy?
Based on current pricing data, the Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) offers better value at $0.0358//GB compared to the LaCie 2big Dock 20TB USB 3.2 Gen 2 External Hard Drive Black at $0.0668//GB — that's roughly 46% less per gigabyte.
The best deal for the Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) is $645.00 at Newegg, while the LaCie 2big Dock 20TB USB 3.2 Gen 2 External Hard Drive Black starts at $1335.66 at Newegg.
However, price per gigabyte isn't everything — consider factors like warranty, performance specs, brand reliability, and your specific capacity needs. Check each Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) and LaCie 2big Dock 20TB USB 3.2 Gen 2 External Hard Drive Black product page for detailed specifications and price history.
Frequently Asked Questions
Is Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) or LaCie 2big Dock 20TB USB 3.2 Gen 2 External Hard Drive Black a better deal?
As of August 2026, Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) offers better value at $0.0358//GB compared to LaCie 2big Dock 20TB USB 3.2 Gen 2 External Hard Drive Black at $0.0668//GB. That is approximately 46% better value per gigabyte.
What is the price per GB of Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D)?
The Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) is currently priced at $0.0358/GB ($645.00 for 18TB) at Newegg.
Where can I buy LaCie 2big Dock 20TB USB 3.2 Gen 2 External Hard Drive Black for the cheapest price?
The cheapest price for the LaCie 2big Dock 20TB USB 3.2 Gen 2 External Hard Drive Black is $1335.66 at Newegg, which works out to $0.0668/GB.