The HGST HDS724040ALE640 Deskstar 7K4000 HDS724040ALA640 4 TB Hard Drive - 3.5' Internal - SATA (SATA/600) costs $0.0323/GB while the WD Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD40PURZ costs $0.0736/GB. HGST HDS724040ALE640 Deskstar 7K4000 HDS724040ALA640 4 TB Hard Drive - 3.5' Internal - SATA (SATA/600) offers 56% better value per gigabyte as of June 2026. Both products are available on BuyPerUnit with prices from Amazon, Best Buy, and Newegg.
HGST HDS724040ALE640 Deskstar 7K4000 HDS724040ALA640 4 TB Hard Drive - 3.5' Internal - SATA (SATA/600) vs WD Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD40PURZ — Which Is Better Value?
Specification Comparison
| Spec | HGST HDS724040ALE640 Deskstar 7K4000 HDS724040ALA640 4 TB Hard Drive - 3.5' Internal - SATA (SATA/600) | WD Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD40PURZ |
|---|---|---|
| Brand | HGST | Western Digital |
| Capacity | 4TB | 4TB |
| $/GB | $0.0323 | $0.0736 |
| Price | $129.10 | $294.45 |
| 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 HGST HDS724040ALE640 Deskstar 7K4000 HDS724040ALA640 4 TB Hard Drive - 3.5' Internal - SATA (SATA/600) offers better value at $0.0323//GB compared to the WD Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD40PURZ at $0.0736//GB — that's roughly 56% less per gigabyte.
The best deal for the HGST HDS724040ALE640 Deskstar 7K4000 HDS724040ALA640 4 TB Hard Drive - 3.5' Internal - SATA (SATA/600) is $129.10 at Newegg, while the WD Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD40PURZ starts at $294.45 at Newegg.
However, price per gigabyte isn't everything — consider factors like warranty, performance specs, brand reliability, and your specific capacity needs. Check each HGST HDS724040ALE640 Deskstar 7K4000 HDS724040ALA640 4 TB Hard Drive - 3.5' Internal - SATA (SATA/600) and WD Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD40PURZ product page for detailed specifications and price history.
Frequently Asked Questions
Is HGST HDS724040ALE640 Deskstar 7K4000 HDS724040ALA640 4 TB Hard Drive - 3.5' Internal - SATA (SATA/600) or WD Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD40PURZ a better deal?
As of June 2026, HGST HDS724040ALE640 Deskstar 7K4000 HDS724040ALA640 4 TB Hard Drive - 3.5' Internal - SATA (SATA/600) offers better value at $0.0323//GB compared to WD Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD40PURZ at $0.0736//GB. That is approximately 56% better value per gigabyte.
What is the price per GB of HGST HDS724040ALE640 Deskstar 7K4000 HDS724040ALA640 4 TB Hard Drive - 3.5' Internal - SATA (SATA/600)?
The HGST HDS724040ALE640 Deskstar 7K4000 HDS724040ALA640 4 TB Hard Drive - 3.5' Internal - SATA (SATA/600) is currently priced at $0.0323/GB ($129.10 for 4TB) at Newegg.
Where can I buy WD Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD40PURZ for the cheapest price?
The cheapest price for the WD Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD40PURZ is $294.45 at Newegg, which works out to $0.0736/GB.