The Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD43PURZ costs $0.0324/GB while the SANDISK - Ultra PLUS 128GB SDXC UHS-I Memory Card costs $0.3515/GB. Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD43PURZ offers 91% better value per gigabyte as of May 2026. Both products are available on BuyPerUnit with prices from Amazon, Best Buy, and Newegg.
Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD43PURZ vs SANDISK - Ultra PLUS 128GB SDXC UHS-I Memory Card — Which Is Better Value?
SANDISK - Ultra PLUS 128GB SDXC UHS-I Memory Card
Specification Comparison
| Spec | Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD43PURZ | SANDISK - Ultra PLUS 128GB SDXC UHS-I Memory Card |
|---|---|---|
| Brand | Western Digital | SanDisk |
| Capacity | 4 TB | 128 GB |
| $/GB | $0.0324 | $0.3515 |
| Price | $129.77 | $44.99 |
| Retailer | Amazon | Best Buy |
| Category | Hard Drives (HDD) | Hard Drives (HDD) |
| Subcategory | hdd | micro-sd |
Price Across Retailers
Which Should You Buy?
Based on current pricing data, the Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD43PURZ offers better value at $0.0324//GB compared to the SANDISK - Ultra PLUS 128GB SDXC UHS-I Memory Card at $0.3515//GB — that's roughly 91% less per gigabyte.
The best deal for the Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD43PURZ is $129.77 at Amazon, while the SANDISK - Ultra PLUS 128GB SDXC UHS-I Memory Card starts at $44.99 at Best Buy.
However, price per gigabyte isn't everything — consider factors like warranty, performance specs, brand reliability, and your specific capacity needs. Check each Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD43PURZ and SANDISK - Ultra PLUS 128GB SDXC UHS-I Memory Card product page for detailed specifications and price history.
Frequently Asked Questions
Is Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD43PURZ or SANDISK - Ultra PLUS 128GB SDXC UHS-I Memory Card a better deal?
As of May 2026, Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD43PURZ offers better value at $0.0324//GB compared to SANDISK - Ultra PLUS 128GB SDXC UHS-I Memory Card at $0.3515//GB. That is approximately 91% better value per gigabyte.
What is the price per GB of Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD43PURZ?
The Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD43PURZ is currently priced at $0.0324/GB ($129.77 for 4 TB) at Amazon.
Where can I buy SANDISK - Ultra PLUS 128GB SDXC UHS-I Memory Card for the cheapest price?
The cheapest price for the SANDISK - Ultra PLUS 128GB SDXC UHS-I Memory Card is $44.99 at Best Buy, which works out to $0.3515/GB.