The Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) costs $0.0378/GB while the Toshiba 20TB X300 Performance 3.5' CMR Internal Hard Drive costs $0.0325/GB. Toshiba 20TB X300 Performance 3.5' CMR Internal Hard Drive offers 14% better value per gigabyte as of July 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 Toshiba 20TB X300 Performance 3.5' CMR Internal Hard Drive — Which Is Better Value?
Specification Comparison
| Spec | Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) | Toshiba 20TB X300 Performance 3.5' CMR Internal Hard Drive |
|---|---|---|
| Brand | Seagate | Toshiba |
| Capacity | 18TB | 20TB |
| $/GB | $0.0378 | $0.0325 |
| Price | $680.00 | $649.97 |
| Retailer | Newegg | Newegg |
| Category | Hard Drives (HDD) | Hard Drives (HDD) |
| Subcategory | hdd | hdd |
Price Across Retailers
Which Should You Buy?
Based on current pricing data, the Toshiba 20TB X300 Performance 3.5' CMR Internal Hard Drive 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 $0.0378//GB — that's roughly 14% less per gigabyte.
The best deal for the Toshiba 20TB X300 Performance 3.5' CMR Internal Hard Drive is $649.97 at Newegg, while the Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive (ST18000NM003D) starts at $680.00 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 Toshiba 20TB X300 Performance 3.5' CMR Internal Hard Drive 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 Toshiba 20TB X300 Performance 3.5' CMR Internal Hard Drive a better deal?
As of July 2026, Toshiba 20TB X300 Performance 3.5' CMR Internal Hard Drive 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 $0.0378//GB. That is approximately 14% 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 $0.0378/GB ($680.00 for 18TB) at Newegg.
Where can I buy Toshiba 20TB X300 Performance 3.5' CMR Internal Hard Drive for the cheapest price?
The cheapest price for the Toshiba 20TB X300 Performance 3.5' CMR Internal Hard Drive is $649.97 at Newegg, which works out to $0.0325/GB.