Choosing NAS storage & drives comes down to a tradeoff: do you want the lower listed price, or a more specifically described setup? The prices are $130.95 apart. Seagate BlackArmor NAS 400 series centers on storage and management, while QNAP TS-431P2 gives shoppers a clearly named model and personal-cloud direction. That makes the decision less about the NAS label alone and more about the role, package scope, and price that fit your plans.
Quick verdict
Choose Seagate when minimizing listed spend is the first filter and a NAS device focused on centralized storage suits you. Choose QNAP when the title-defined *4-Bay Personal Cloud* format is the reason you are shopping. QNAP's package scope is part of the decision. Pick based on use case first, then decide whether the higher listed price fits.
At-a-glance price comparison
| Product | Listed price | Condition |
|---|---|---|
| Seagate BlackArmor NAS 400 series | $39.00 | Used |
| QNAP TS-431P2 | $169.95 | Used |
Where each product wins
Seagate BlackArmor NAS 400 series wins on upfront cost. Its $39.00 figure is the lower listed price, making it the straightforward pick when total spend leads the decision. The title identifies a BlackArmor NAS 400 series device, and its storage-and-management focus supports a centralized-storage use case. It is the simpler recommendation for a shopper who does not need the QNAP title's more specific four-bay personal-cloud framing.
QNAP TS-431P2 wins on format specificity. *4-Bay Personal Cloud* appears in the product title, and four caddies are included. Those are concrete reasons to choose QNAP when a defined multi-bay personal-cloud unit is the target rather than simply the lowest listed price. Its package scope still needs to fit the plan, because the appeal here is the named format and included caddies-not an inferred performance advantage.
Product notes
Network Attached Storage (NAS) device, Seagate BlackArmor NAS 400 series
The Seagate BlackArmor NAS 400 series makes sense when the lower listed price is the deciding factor. Its title names a NAS device, and it centers on storage, data management, and a centralized storage solution, giving it a clear role for a shopper building around networked storage. The concrete limitation is the Used condition. That is a meaningful reason to pass for anyone who specifically wants a new unit, even when the lower price is attractive. Choose Seagate for the price-led route and the stated centralized-storage purpose; the recommendation rests on those concrete points rather than an assumed bay layout or drive bundle.
Qnap TS-431P2 Network Attached Storage NAS 4-Bay Personal Cloud
QNAP TS-431P2 is more suitable when a defined model and included hardware detail matter more than the lowest listed price. Four caddies are included, which is a concrete reason to favor it for a shopper planning around the named unit. The limitation is equally concrete: the unit-only package does not include a power adapter or drives. Shoppers who need those pieces included should not treat the headline format as a complete storage package. Select QNAP for the model-specific package and included caddies, but only if that package scope fits the intended setup.
Final choice by use case
- Choose Seagate BlackArmor NAS 400 series when the lower listed price and centralized-storage purpose are the priority.
- Choose QNAP TS-431P2 when its named model and unit-only package fit the plan.
- Use Seagate for a price-led NAS decision; use QNAP when the more specifically defined personal-cloud format matters.
The bottom line is simple: Seagate keeps the decision price-led, while QNAP makes more sense for a shopper seeking a specifically named multi-bay format and accepting the unit-only scope.
