The Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) costs $0.0361/GB while the Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray costs $0.0325/GB. Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray offers 10% 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 Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray — Which Is Better Value?
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Specification Comparison
| Spec | Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) | Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray |
|---|---|---|
| Brand | Seagate | Seagate |
| Capacity | 18TB | 20 TB |
| $/GB | $0.0361 | $0.0325 |
| Price | $650.00 | $649.99 |
| Retailer | Newegg | Best Buy |
| Category | Hard Drives (HDD) | Hard Drives (HDD) |
| Subcategory | hdd | hdd |
Price Across Retailers
Which Should You Buy?
Based on current pricing data, the Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray offers better value at $0.0325//GB compared to the Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) at $0.0361//GB — that's roughly 10% less per gigabyte.
The best deal for the Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray is $649.99 at Best Buy, while the Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) starts at $650.00 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 Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray 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 Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray a better deal?
As of August 2026, Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray offers better value at $0.0325//GB compared to Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) at $0.0361//GB. That is approximately 10% 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 $0.0361/GB ($650.00 for 18TB) at Newegg.
Where can I buy Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray for the cheapest price?
The cheapest price for the Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray is $649.99 at Best Buy, which works out to $0.0325/GB.