The Seagate One Touch 18TB USB 3.0 / USB Type-C Hard Drives - Desktop External Black costs $0.0222/GB while the WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP costs $0.0490/GB. Seagate One Touch 18TB USB 3.0 / USB Type-C Hard Drives - Desktop External Black offers 55% better value per gigabyte as of June 2026. Both products are available on BuyPerUnit with prices from Amazon, Best Buy, and Newegg.
Seagate One Touch 18TB USB 3.0 / USB Type-C Hard Drives - Desktop External Black vs WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP — Which Is Better Value?
Specification Comparison
| Spec | Seagate One Touch 18TB USB 3.0 / USB Type-C Hard Drives - Desktop External Black | WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP |
|---|---|---|
| Brand | Seagate | Western Digital |
| Capacity | 18TB | 18TB |
| $/GB | $0.0222 | $0.0490 |
| Price | $399.00 | $881.10 |
| 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 Seagate One Touch 18TB USB 3.0 / USB Type-C Hard Drives - Desktop External Black offers better value at $0.0222//GB compared to the WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP at $0.0490//GB — that's roughly 55% less per gigabyte.
The best deal for the Seagate One Touch 18TB USB 3.0 / USB Type-C Hard Drives - Desktop External Black is $399.00 at Newegg, while the WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP starts at $881.10 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 One Touch 18TB USB 3.0 / USB Type-C Hard Drives - Desktop External Black and WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP product page for detailed specifications and price history.
Frequently Asked Questions
Is Seagate One Touch 18TB USB 3.0 / USB Type-C Hard Drives - Desktop External Black or WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP a better deal?
As of June 2026, Seagate One Touch 18TB USB 3.0 / USB Type-C Hard Drives - Desktop External Black offers better value at $0.0222//GB compared to WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP at $0.0490//GB. That is approximately 55% better value per gigabyte.
What is the price per GB of Seagate One Touch 18TB USB 3.0 / USB Type-C Hard Drives - Desktop External Black?
The Seagate One Touch 18TB USB 3.0 / USB Type-C Hard Drives - Desktop External Black is currently priced at $0.0222/GB ($399.00 for 18TB) at Newegg.
Where can I buy WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP for the cheapest price?
The cheapest price for the WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP is $881.10 at Newegg, which works out to $0.0490/GB.