WD Red Plus vs Seagate IronWolf
WD Red Plus and Seagate IronWolf are the two most popular NAS hard drive lines for home and small-business use. Both are designed for always-on, multi-bay enclosures and both offer CMR models across most capacities. The right choice often comes down to price at your target capacity, local availability, and which ecosystem your NAS vendor recommends.
Quick comparison
WD Red Plus is rated for 1–8 bay NAS systems with a 180 TB/year workload rating. IronWolf covers 1–8 bays with a 180 TB/year rating and adds built-in rotational vibration (RV) sensors and IronWolf Health Management (IHM) for compatible Synology, QNAP, and Asustor systems. Both use CMR at most capacities. For most buyers, the best deal per TB wins.
Quick Verdict
- Who this is for
- NAS builders choosing between the two mainstream NAS drive lines for home or small-office Synology, QNAP, TrueNAS, or Unraid systems.
- What usually wins
- The cheaper CMR option at your target capacity. Both lines perform similarly — pick whichever is priced lower per TB when you buy. IronWolf edges ahead if your NAS supports IronWolf Health Management.
- Prioritise
- CMR recording at your target capacity. Then lowest price per TB. Ecosystem features (IHM vs NASware) are a tiebreaker, not a primary factor.
Prices updated hourly from Amazon US and UK. All links go directly to the retailer. Details.
WD Red Plus — Current Prices
Western Digital Red Plus NAS drives sorted by price per terabyte. All CMR, rated for 1–8 bay NAS enclosures with a 180 TB/year workload.
WD Red Plus 8TB NAS 3.5" Internal Hard Drive - 5640 RPM Class, SATA 6 Gb/s, CMR, 128MB Cache
WD Red Plus 10TB NAS 3.5" Internal Hard Drive - 7200 RPM, SATA 6Gb/s, CMR, 256MB Cache
WD Red Plus 6TB NAS 3.5" Internal Hard Drive - 5400 RPM Class, SATA 6Gb/s, CMR, 256MB Cache
WD Red Plus 12TB NAS 3.5" Internal Hard Drive - 7200 RPM, SATA 6Gb/s, CMR, 256MB Cache
WD Red Plus 12TB NAS 3.5" Internal Hard Drive - 7200 RPM Class, SATA 6Gb/s, CMR, 256MB Cache
WD Red Plus 8TB NAS 3.5" Internal Hard Drive - 5640 RPM Class, SATA 6Gb/s, CMR, 128MB Cache
Western Digital 10TB WD Red Plus NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 256 MB Cache, 3.5" - WD101EFBX
WD Red Plus 10TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s, CMR, 256MB Cache, 3.5 Inch
All WD Red Models
All WD Red drives including Red, Red Plus, and Red Pro. Red Pro adds a 300 TB/year workload rating and is designed for up to 24-bay rackmount NAS systems.
WD Red Pro 3.0"" SATA 6Gb/s 10TB 7200rpm HDD
WD 6TB My Passport portable external storage, external hard drive, USB 3.0, portable HDD with software for device management, backup and password protection, works with PC, Xbox &Playstation, Red
WD Red Plus 8TB NAS 3.5" Internal Hard Drive - 5640 RPM Class, SATA 6 Gb/s, CMR, 128MB Cache
WD Red Pro 22TB NAS 3.5" Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, CMR Recording Technology, 512MB Cache
WD Red Pro 18TB NAS 3.5" Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, CMR Recording Technology, 512MB Cache
WD Red Plus 10TB NAS 3.5" Internal Hard Drive - 7200 RPM, SATA 6Gb/s, CMR, 256MB Cache
WD Red Pro 24TB NAS 3.5" Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, CMR Recording Technology, 512MB Cache
WD Red Plus 6TB NAS 3.5" Internal Hard Drive - 5400 RPM Class, SATA 6Gb/s, CMR, 256MB Cache
Seagate IronWolf — Current Prices
Seagate IronWolf NAS drives sorted by price per terabyte. Includes AgileArray dual-plane balance, RV sensors, and IronWolf Health Management on supported NAS hardware.
Seagate IronWolf ST4000VN008 4TB Internal Hard Drive, NAS HDD, 3.5 Inch, 5900 rpm, CMR, 64 MB Cache, SATA 6 GB/s, Silver, 3 Years Data Rescue Service
Seagate IronWolf 14TB NAS Internal Hard Drive HDD – 3.5 Inch SATA 6Gb/s 7200 RPM 256MB Cache for RAID Network Attached Storage (ST14000VN0008)
Seagate IronWolf 12TB, NAS, Internal Hard Drive, CMR, 3.5 Inch, SATA, 6GB/s, 7.200 RPM, 256MB Cache, for RAID Network Attached Storage, Data Rescue Services, FFP (ST12000VNZ008)
Seagate IronWolf Pro, 14 TB, NAS Internal Hard Drive, CMR 3.5 Inch, SATA 6 Gb/s 7,200 RPM, 256 MB Cache, for RAID Network Attached Storage, 3 years Rescue Services, FFP (ST14000NE0008)
Seagate IronWolf Pro, 14 TB, Enterprise NAS Internal HDD –CMR 3.5 Inch, SATA 6 Gb/s, 7,200 RPM, 256 MB Cache for RAID Network Attached Storage, 3 year Rescue Services (ST14000NT001)
Seagate IronWolf Pro 14 TB NAS RAID Internal Hard Drive - 7,200 RPM SATA 6 Gb/s 3.5-inch (ST14000NE0008)
Seagate IronWolf Pro 24TB, NAS Internal Hard Drive, 3.5 Inch, 7.200 U/Min, CMR, 256MB Cache, SATA 6 GB/S, incl. Datat Rescue Service (ST24000NTZ02)
Seagate IronWolf Pro 3.5-inch 18TB Internal Hard Disk HDD CMR 3.5 Inch Data Recovery ST18000NT001 6Gb/s 256MB 7200 rpm 24 Hour Operation PC
CMR NAS Drives — Both Brands
Conventional Magnetic Recording drives from both WD and Seagate, filtered to CMR only. Essential for RAID and ZFS arrays where SMR write performance is a concern.
Why this matters: CMR (Conventional Magnetic Recording) handles random writes and RAID rebuilds significantly better than SMR. If you are running any form of RAID, ZFS, or Btrfs, CMR is strongly recommended. Both WD Red Plus and IronWolf offer CMR at most capacity points.
Seagate IronWolf ST4000VN008 4TB Internal Hard Drive, NAS HDD, 3.5 Inch, 5900 rpm, CMR, 64 MB Cache, SATA 6 GB/s, Silver, 3 Years Data Rescue Service
WD Red Pro 3.0"" SATA 6Gb/s 10TB 7200rpm HDD
WD Red Plus 8TB NAS 3.5" Internal Hard Drive - 5640 RPM Class, SATA 6 Gb/s, CMR, 128MB Cache
Seagate IronWolf 14TB NAS Internal Hard Drive HDD – 3.5 Inch SATA 6Gb/s 7200 RPM 256MB Cache for RAID Network Attached Storage (ST14000VN0008)
Seagate IronWolf 12TB, NAS, Internal Hard Drive, CMR, 3.5 Inch, SATA, 6GB/s, 7.200 RPM, 256MB Cache, for RAID Network Attached Storage, Data Rescue Services, FFP (ST12000VNZ008)
Seagate IronWolf Pro, 14 TB, NAS Internal Hard Drive, CMR 3.5 Inch, SATA 6 Gb/s 7,200 RPM, 256 MB Cache, for RAID Network Attached Storage, 3 years Rescue Services, FFP (ST14000NE0008)
Seagate IronWolf Pro, 14 TB, Enterprise NAS Internal HDD –CMR 3.5 Inch, SATA 6 Gb/s, 7,200 RPM, 256 MB Cache for RAID Network Attached Storage, 3 year Rescue Services (ST14000NT001)
Seagate IronWolf Pro 14 TB NAS RAID Internal Hard Drive - 7,200 RPM SATA 6 Gb/s 3.5-inch (ST14000NE0008)
How to Choose
WD Red Plus and Seagate IronWolf are more alike than different. Here is what actually separates them.
CMR availability
Both lines offer CMR at most capacity points, but verify before buying — entry-level models have occasionally used SMR. CMR is essential for RAID and ZFS arrays where SMR write behaviour causes rebuild issues.
Bay count and workload
Both are rated for 1–8 bays and 180 TB/year workloads. If you need more, step up to Red Pro or IronWolf Pro (both rated for up to 24 bays and 300 TB/year). For a typical home NAS, standard models are sufficient.
Ecosystem features
IronWolf includes rotational vibration sensors and IronWolf Health Management (IHM) on compatible NAS hardware. WD Red Plus uses NASware 3.0 firmware for multi-bay optimisation. IHM provides proactive drive health alerts if your NAS supports it — a useful feature for unattended systems.
Price at capacity
Pricing between Red Plus and IronWolf shifts frequently. At any given capacity point, one brand is often noticeably cheaper than the other. Check both columns and buy the better deal — the performance and reliability difference is negligible for home NAS workloads.
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