The Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) costs $0.0376/GB while the WD - easystore 18TB External USB 3.0 Hard Drive - Black costs $0.0283/GB. WD - easystore 18TB External USB 3.0 Hard Drive - Black offers 25% better value per gigabyte as of June 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 WD - easystore 18TB External USB 3.0 Hard Drive - Black — Which Is Better Value?
WD - easystore 18TB External USB 3.0 Hard Drive - Black
Specification Comparison
| Spec | Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) | WD - easystore 18TB External USB 3.0 Hard Drive - Black |
|---|---|---|
| Brand | Seagate | Western Digital |
| Capacity | 18TB | 18 TB |
| $/GB | $0.0376 | $0.0283 |
| Price | $677.00 | $509.99 |
| 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 WD - easystore 18TB External USB 3.0 Hard Drive - Black offers better value at $0.0283//GB compared to the Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) at $0.0376//GB — that's roughly 25% less per gigabyte.
The best deal for the WD - easystore 18TB External USB 3.0 Hard Drive - Black is $509.99 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 $677.00 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 WD - easystore 18TB External USB 3.0 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 WD - easystore 18TB External USB 3.0 Hard Drive - Black a better deal?
As of June 2026, WD - easystore 18TB External USB 3.0 Hard Drive - Black offers better value at $0.0283//GB compared to Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) at $0.0376//GB. That is approximately 25% 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 $0.0376/GB ($677.00 for 18TB) at Newegg.
Where can I buy WD - easystore 18TB External USB 3.0 Hard Drive - Black for the cheapest price?
The cheapest price for the WD - easystore 18TB External USB 3.0 Hard Drive - Black is $509.99 at Best Buy, which works out to $0.0283/GB.