The WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP costs $0.0469/GB while the Seagate Exos X20z ST20000NM001J 20TB 7.2K RPM SATA 6Gb/s 3.5 (HOST MANAGED SMR) costs $0.0315/GB. Seagate Exos X20z ST20000NM001J 20TB 7.2K RPM SATA 6Gb/s 3.5 (HOST MANAGED SMR) offers 33% better value per gigabyte as of July 2026. Both products are available on BuyPerUnit with prices from Amazon, Best Buy, and Newegg.
WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP vs Seagate Exos X20z ST20000NM001J 20TB 7.2K RPM SATA 6Gb/s 3.5 (HOST MANAGED SMR) — Which Is Better Value?
Specification Comparison
| Spec | WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP | Seagate Exos X20z ST20000NM001J 20TB 7.2K RPM SATA 6Gb/s 3.5 (HOST MANAGED SMR) |
|---|---|---|
| Brand | Western Digital | Seagate |
| Capacity | 18TB | 20TB |
| $/GB | $0.0469 | $0.0315 |
| Price | $844.99 | $630.00 |
| 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 Exos X20z ST20000NM001J 20TB 7.2K RPM SATA 6Gb/s 3.5 (HOST MANAGED SMR) offers better value at $0.0315//GB compared to the WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP at $0.0469//GB — that's roughly 33% less per gigabyte.
The best deal for the Seagate Exos X20z ST20000NM001J 20TB 7.2K RPM SATA 6Gb/s 3.5 (HOST MANAGED SMR) is $630.00 at Newegg, while the WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP starts at $844.99 at Newegg.
However, price per gigabyte isn't everything — consider factors like warranty, performance specs, brand reliability, and your specific capacity needs. Check each WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP and Seagate Exos X20z ST20000NM001J 20TB 7.2K RPM SATA 6Gb/s 3.5 (HOST MANAGED SMR) product page for detailed specifications and price history.
Frequently Asked Questions
Is WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP or Seagate Exos X20z ST20000NM001J 20TB 7.2K RPM SATA 6Gb/s 3.5 (HOST MANAGED SMR) a better deal?
As of July 2026, Seagate Exos X20z ST20000NM001J 20TB 7.2K RPM SATA 6Gb/s 3.5 (HOST MANAGED SMR) offers better value at $0.0315//GB compared to WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP at $0.0469//GB. That is approximately 33% better value per gigabyte.
What is the price per GB of WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP?
The WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive - WD181PURP is currently priced at $0.0469/GB ($844.99 for 18TB) at Newegg.
Where can I buy Seagate Exos X20z ST20000NM001J 20TB 7.2K RPM SATA 6Gb/s 3.5 (HOST MANAGED SMR) for the cheapest price?
The cheapest price for the Seagate Exos X20z ST20000NM001J 20TB 7.2K RPM SATA 6Gb/s 3.5 (HOST MANAGED SMR) is $630.00 at Newegg, which works out to $0.0315/GB.