The WD Ultrastar DC HC550 18TB Hard Drive 3.5' Internal 512MB SATA 7200 RPM 512E SE NP3 DC HC550 0F38459 (WUH721818ALE6L4) costs $0.0342/GB while the Seagate One Touch STLC18000400 18 TB Hard Drive - 3.5' External - SATA (SATA/600) - Black - USB 3.0 Micro-B costs $0.0589/GB. WD Ultrastar DC HC550 18TB Hard Drive 3.5' Internal 512MB SATA 7200 RPM 512E SE NP3 DC HC550 0F38459 (WUH721818ALE6L4) offers 42% better value per gigabyte as of August 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 Seagate One Touch STLC18000400 18 TB Hard Drive - 3.5' External - SATA (SATA/600) - Black - USB 3.0 Micro-B — 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) | Seagate One Touch STLC18000400 18 TB Hard Drive - 3.5' External - SATA (SATA/600) - Black - USB 3.0 Micro-B |
|---|---|---|
| Brand | Western Digital | Seagate |
| Capacity | 18TB | 18TB |
| $/GB | $0.0342 | $0.0589 |
| Price | $615.95 | $1061.08 |
| Retailer | Newegg | Newegg |
| Category | Hard Drives (HDD) | Hard Drives (HDD) |
| Subcategory | hdd | hdd |
Price Across Retailers
WD Ultrastar DC HC550 18TB Hard Drive 3.5' Internal 512MB SATA 7200 RPM 512E SE NP3 DC HC550 0F38459 (WUH721818ALE6L4)
Seagate One Touch STLC18000400 18 TB Hard Drive - 3.5' External - SATA (SATA/600) - Black - USB 3.0 Micro-B
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 $0.0342//GB compared to the Seagate One Touch STLC18000400 18 TB Hard Drive - 3.5' External - SATA (SATA/600) - Black - USB 3.0 Micro-B at $0.0589//GB — that's roughly 42% 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 $615.95 at Newegg, while the Seagate One Touch STLC18000400 18 TB Hard Drive - 3.5' External - SATA (SATA/600) - Black - USB 3.0 Micro-B starts at $1061.08 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 Seagate One Touch STLC18000400 18 TB Hard Drive - 3.5' External - SATA (SATA/600) - Black - USB 3.0 Micro-B 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 Seagate One Touch STLC18000400 18 TB Hard Drive - 3.5' External - SATA (SATA/600) - Black - USB 3.0 Micro-B a better deal?
As of August 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 $0.0342//GB compared to Seagate One Touch STLC18000400 18 TB Hard Drive - 3.5' External - SATA (SATA/600) - Black - USB 3.0 Micro-B at $0.0589//GB. That is approximately 42% 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 $0.0342/GB ($615.95 for 18TB) at Newegg.
Where can I buy Seagate One Touch STLC18000400 18 TB Hard Drive - 3.5' External - SATA (SATA/600) - Black - USB 3.0 Micro-B for the cheapest price?
The cheapest price for the Seagate One Touch STLC18000400 18 TB Hard Drive - 3.5' External - SATA (SATA/600) - Black - USB 3.0 Micro-B is $1061.08 at Newegg, which works out to $0.0589/GB.