The WD Ultrastar DC HC550 18TB Hard Drive 3.5' Internal 512MB SATA 7200 RPM 512E SE NP3 DC HC550 0F38459 (WUH721818ALE6L4) costs $0.0329/GB while the Synology 20TB HAT3320 Plus Series SATA III 3.5' Internal NAS HDD ( HAT3320-20T) costs $0.0410/GB. WD Ultrastar DC HC550 18TB Hard Drive 3.5' Internal 512MB SATA 7200 RPM 512E SE NP3 DC HC550 0F38459 (WUH721818ALE6L4) offers 20% better value per gigabyte as of September 2026. Both products are available on BuyPerUnit with prices from Amazon, Best Buy, and Newegg.
WD Ultrastar DC HC550 18TB Hard Drive 3.5' Internal 512MB SATA 7200 RPM 512E SE NP3 DC HC550 0F38459 (WUH721818ALE6L4) vs Synology 20TB HAT3320 Plus Series SATA III 3.5' Internal NAS HDD ( HAT3320-20T) — Which Is Better Value?
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Specification Comparison
| Spec | WD Ultrastar DC HC550 18TB Hard Drive 3.5' Internal 512MB SATA 7200 RPM 512E SE NP3 DC HC550 0F38459 (WUH721818ALE6L4) | Synology 20TB HAT3320 Plus Series SATA III 3.5' Internal NAS HDD ( HAT3320-20T) |
|---|---|---|
| Brand | Western Digital | Synology |
| Capacity | 18TB | 20TB |
| $/GB | $0.0329 | $0.0410 |
| Price | $591.79 | $819.99 |
| 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 WD Ultrastar DC HC550 18TB Hard Drive 3.5' Internal 512MB SATA 7200 RPM 512E SE NP3 DC HC550 0F38459 (WUH721818ALE6L4) offers better value at $0.0329//GB compared to the Synology 20TB HAT3320 Plus Series SATA III 3.5' Internal NAS HDD ( HAT3320-20T) at $0.0410//GB — that's roughly 20% less per gigabyte.
The best deal for the WD Ultrastar DC HC550 18TB Hard Drive 3.5' Internal 512MB SATA 7200 RPM 512E SE NP3 DC HC550 0F38459 (WUH721818ALE6L4) is $591.79 at Newegg, while the Synology 20TB HAT3320 Plus Series SATA III 3.5' Internal NAS HDD ( HAT3320-20T) starts at $819.99 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 Ultrastar DC HC550 18TB Hard Drive 3.5' Internal 512MB SATA 7200 RPM 512E SE NP3 DC HC550 0F38459 (WUH721818ALE6L4) and Synology 20TB HAT3320 Plus Series SATA III 3.5' Internal NAS HDD ( HAT3320-20T) product page for detailed specifications and price history.
Frequently Asked Questions
Is WD Ultrastar DC HC550 18TB Hard Drive 3.5' Internal 512MB SATA 7200 RPM 512E SE NP3 DC HC550 0F38459 (WUH721818ALE6L4) or Synology 20TB HAT3320 Plus Series SATA III 3.5' Internal NAS HDD ( HAT3320-20T) a better deal?
As of September 2026, WD Ultrastar DC HC550 18TB Hard Drive 3.5' Internal 512MB SATA 7200 RPM 512E SE NP3 DC HC550 0F38459 (WUH721818ALE6L4) offers better value at $0.0329//GB compared to Synology 20TB HAT3320 Plus Series SATA III 3.5' Internal NAS HDD ( HAT3320-20T) at $0.0410//GB. That is approximately 20% better value per gigabyte.
What is the price per GB of WD Ultrastar DC HC550 18TB Hard Drive 3.5' Internal 512MB SATA 7200 RPM 512E SE NP3 DC HC550 0F38459 (WUH721818ALE6L4)?
The WD Ultrastar DC HC550 18TB Hard Drive 3.5' Internal 512MB SATA 7200 RPM 512E SE NP3 DC HC550 0F38459 (WUH721818ALE6L4) is currently priced at $0.0329/GB ($591.79 for 18TB) at Newegg.
Where can I buy Synology 20TB HAT3320 Plus Series SATA III 3.5' Internal NAS HDD ( HAT3320-20T) for the cheapest price?
The cheapest price for the Synology 20TB HAT3320 Plus Series SATA III 3.5' Internal NAS HDD ( HAT3320-20T) is $819.99 at Newegg, which works out to $0.0410/GB.