The Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray costs $0.0325/GB while the SanDisk Professional 18TB G-DRIVE PROJECT Thunderbolt 3 External Hard Drive costs $0.0586/GB. Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray offers 45% better value per gigabyte as of July 2026. Both products are available on BuyPerUnit with prices from Amazon, Best Buy, and Newegg.
Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray vs SanDisk Professional 18TB G-DRIVE PROJECT Thunderbolt 3 External Hard Drive — Which Is Better Value?
Specification Comparison
| Spec | Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray | SanDisk Professional 18TB G-DRIVE PROJECT Thunderbolt 3 External Hard Drive |
|---|---|---|
| Brand | Seagate | SanDisk |
| Capacity | 20 TB | 18TB |
| $/GB | $0.0325 | $0.0586 |
| Price | $649.99 | $1054.99 |
| Retailer | Best Buy | Newegg |
| 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 SanDisk Professional 18TB G-DRIVE PROJECT Thunderbolt 3 External Hard Drive at $0.0586//GB — that's roughly 45% 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 SanDisk Professional 18TB G-DRIVE PROJECT Thunderbolt 3 External Hard Drive starts at $1054.99 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 - Seagate One Touch Desktop HDD 20 TB - Space Gray and SanDisk Professional 18TB G-DRIVE PROJECT Thunderbolt 3 External Hard Drive product page for detailed specifications and price history.
Frequently Asked Questions
Is Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray or SanDisk Professional 18TB G-DRIVE PROJECT Thunderbolt 3 External Hard Drive a better deal?
As of July 2026, Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray offers better value at $0.0325//GB compared to SanDisk Professional 18TB G-DRIVE PROJECT Thunderbolt 3 External Hard Drive at $0.0586//GB. That is approximately 45% better value per gigabyte.
What is the price per GB of Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray?
The Seagate - Seagate One Touch Desktop HDD 20 TB - Space Gray is currently priced at $0.0325/GB ($649.99 for 20 TB) at Best Buy.
Where can I buy SanDisk Professional 18TB G-DRIVE PROJECT Thunderbolt 3 External Hard Drive for the cheapest price?
The cheapest price for the SanDisk Professional 18TB G-DRIVE PROJECT Thunderbolt 3 External Hard Drive is $1054.99 at Newegg, which works out to $0.0586/GB.