WD vs Seagate: Reliability & Price Comparison
Western Digital and Seagate are the only two major HDD manufacturers left. Both make excellent drives, but their product lines, warranty policies, and pricing strategies differ. This page puts their drives side by side so you can compare real prices and make an informed choice instead of relying on brand loyalty.
The reliability question
Backblaze publishes quarterly drive failure data from their datacenter fleet. As of 2025–2026, both WD and Seagate enterprise drives show annual failure rates between 0.5–2.5% depending on model and age. No brand has a decisive reliability edge. Individual model selection matters more than the logo on the label.
Quick Verdict
- Who this is for
- NAS builders, server admins, and storage shoppers trying to decide between WD and Seagate product lines.
- What usually wins
- Compare specific models, not brands. WD Red Plus vs Seagate IronWolf, WD Ultrastar vs Seagate Exos. Pick whichever is cheaper at your target capacity. Both are reliable when used within their rated workloads.
- Prioritise
- Price per TB for equivalent-tier drives. Then warranty length and workload rating for your specific use case.
Prices updated daily from Amazon.com. All links go directly to the retailer. Details.
Bottom line: the lowest price-per-TB pick on this page right now is the HGST Ultrastar DC HC510 (He10) 10TB 7200 RPM SATA 6Gb/s 256MB Cache 3.5-Inch | Power Disable | Enterprise Hard Drive - HUH721010ALE600 (0F27452), 10 TB used, at $200.00 ($20.00/TB) on Amazon.com. Check the current price.
Western Digital Drives, Best Prices
WD hard drives across all product lines ranked by price per TB.
WD-40 Ultrastar HE12 12TB SAS 512E
SAS interface. Needs a host bus adapter, it will not plug into a normal motherboard.
HGST Ultrastar He 3.5-inch 6000GB 64MB Cache 7200RPM SATA Ultra 512n Helium Platform Enterprise HDD HUS726060ALA640
WD 20TB Elements Desktop External Hard Drive, USB 3.0 drive for plug-and-play storage - WDBWLG0200HBK-NESN
HGST Ultrastar He8 Helium 6TB 3.5-Inch 7200RPM SATA ULTRA 512e SE 128MB Cache Internal Bare or OEM Hard Drive - HUH728060ALE604 / 0F23669
WD Black 4TB SATA 6.0 3.5" Desktop HDD WD4003FZEX
WD 6TB 3.5" AE Datacenter Archive SATA III 64 MB Cache Enterprise Hard Drive (WD6001F4PZ)
Western Digital 10TB Elements Desktop External Hard Drive - USB 3.0
HGST 0B36047 - Ultrastar 7K6 HUS726T6TAL5204 - Hard Drive - 6 TB - Internal - 3.5" - SAS 12Gb/s - 7200 RPM - Buffer: 256 MB
SAS interface. Needs a host bus adapter, it will not plug into a normal motherboard.
Seagate Drives, Best Prices
Seagate hard drives across all product lines ranked by price per TB.
Seagate Enterprise Capacity 3.5 HDD (Constellation ES) 4TB 7200RPM
SAS interface. Needs a host bus adapter, it will not plug into a normal motherboard.
Seagate ST6000NM0024 6TB 7.2K SATA 3.5" HDD
Seagate Expansion 24TB External Hard Drive HDD - USB 3.0, with Rescue Data Recovery Services (STKP24000400)
Seagate 10TB SAS 7.2K RPM 12Gbps 3.5" 4Kn HDD ST10000NM0226
SAS interface. Needs a host bus adapter, it will not plug into a normal motherboard.
Seagate Skyhawk ST6000VX0023 6 TB Internal Hard Drive
Seagate 10TB EXOS X16 SAS SSD 7.2K RPM FIPS NCNR TAA Compliant
SAS interface. Needs a host bus adapter, it will not plug into a normal motherboard.
Seagate Expansion Desktop 10TB, External Hard Drive, USB 3.0, Data Rescue Services (STKP10000400)
Seagate ST10000NM0146 10TB Exos X10 HDD SATA 3.5 7200 256MB External Hard Drives
Refurbished Enterprise, WD Ultrastar vs Seagate Exos
Recertified datacenter pulls from both brands, the cheapest high-capacity drives available.
HKRVPXD EXOS 7E8 SAS HDD ST8000NM0075 8TB 7.2K 7200Rpm 256MB 12Gbps Enterprise Capacity 3.5 HDD Hard Drive for Server
SAS interface. Needs a host bus adapter, it will not plug into a normal motherboard.
HGST Ultrastar DC HC510 (He10) 10TB 7200 RPM SATA 6Gb/s 256MB Cache 3.5-Inch | Power Disable | Enterprise Hard Drive - HUH721010ALE600 (0F27452)
Seagate Enterprise ST18000NM004J Internal Hard Drive 3.5" 18TB SAS
SAS interface. Needs a host bus adapter, it will not plug into a normal motherboard.
HPE 819201-B21 8TB 12G SAS 7.2K LFF 512E SC MDL Hard Disk Drive
SAS interface. Needs a host bus adapter, it will not plug into a normal motherboard.
Genuine HUH721212AL4200 12TB HDD 7200 RPM SAS 12Gb/s LFF Drive Original
SAS interface. Needs a host bus adapter, it will not plug into a normal motherboard.
HPE 12 TB Hard Drive - 3.5" Internal - SAS (12Gb/s SAS)
SAS interface. Needs a host bus adapter, it will not plug into a normal motherboard.
Dell 400-ATKR 8TB 7.2K SAS 3.5" 12Gb/s HDD KIT 14TH Generation Servers POWEREDGE R640 R740 R740XD R940 C6420 POWERVAULT MD1400 MD1420
SAS interface. Needs a host bus adapter, it will not plug into a normal motherboard.
Genuine P09155-B21 14TB SAS 12G BC 7.2K LFF LP He 512e MV HDD Original
SAS interface. Needs a host bus adapter, it will not plug into a normal motherboard.
How to Choose
Here is how the two brands compare across the factors that actually matter.
NAS drives
WD Red Plus (CMR) competes with Seagate IronWolf. Both are rated for 1–8 bay NAS use with 180 TB/year workload. Pricing fluctuates. Check both and buy whichever is cheaper at your target capacity.
Enterprise drives
WD Ultrastar competes with Seagate Exos. Both offer 5-year warranties, 550 TB/year workload ratings, and vibration sensors for high-density enclosures. Refurbished Exos and Ultrastar drives dominate the used market.
Warranty and RMA
Both brands offer similar warranty terms (2–3 years consumer, 5 years enterprise/Pro). RMA experiences vary by region. Check warranty transfer policies if buying from third-party sellers. Some warranties are non-transferable.
Recording technology
Both brands use SMR in some consumer models. Always verify CMR vs SMR for your specific model. Brand alone does not guarantee recording technology. NAS and enterprise lines from both brands are CMR.
Frequently Asked Questions
Is WD or Seagate more reliable?
Neither brand has a decisive reliability advantage. Backblaze publishes quarterly failure data from their datacenter fleet and as of 2025–2026 both WD and Seagate enterprise drives show annual failure rates between 0.5–2.5% depending on model and age. Individual model selection within each brand matters more than the logo. Pick the cheaper drive at your target capacity from equivalent tiers.
What are the equivalent NAS drive tiers between WD and Seagate?
WD Red (SMR) competes with Seagate IronWolf for basic NAS. WD Red Plus (CMR) is the closer match to IronWolf for NAS workloads. WD Red Pro and Seagate IronWolf Pro are the premium NAS tiers for heavy workloads and larger bay counts. On the enterprise side, WD Ultrastar competes with Seagate Exos.
Do WD and Seagate offer the same warranties?
Consumer drive warranties are similar: 2–3 years across both brands. Enterprise and Pro NAS lines from both offer 5-year warranties. RMA experience varies by region and individual case. Some warranties from both brands are non-transferable when bought from a third-party seller — check warranty terms before buying used or from grey-market channels.
Do Seagate or WD drives use SMR recording?
Both brands use SMR in some consumer models. Neither brand is SMR-free across all product lines. NAS and enterprise lines (IronWolf, IronWolf Pro, Exos, WD Red Plus, WD Red Pro, Ultrastar) are CMR. Standard desktop lines (Seagate Barracuda at some capacities, WD Blue, WD Red at smaller sizes) have included SMR variants. Always verify the recording technology for the specific model and capacity you are buying, not just the product line name.
Which brand is better for a NAS: WD or Seagate?
Compare specific equivalent models: WD Red Plus vs Seagate IronWolf, or WD Red Pro vs Seagate IronWolf Pro. Both are designed for NAS use with similar workload ratings. The tables on this page rank drives from both brands side by side by price per TB — buy whichever is cheaper at your target capacity on the day you shop.
Related Guides and Articles
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