The closest like-for-like alternative is the Seagate IronWolf 4TB (ST4000VNZ06). It keeps the same NAS-focused CMR design, 3.5-inch SATA 6Gb/s interface, 256MB cache and 5,400 RPM class tuning, so it behaves much like the 2TB drive but with double the capacity. At £138.99, it’s only a little more expensive than the 2TB model, which makes it a much better value if your NAS has spare bays and you want room for Plex media, backups, or RAID redundancy. The downside is simple: it still isn’t an SSD, so it won’t improve application responsiveness or VM performance.

If you want maximum capacity in a single bay, the Seagate IronWolf 8TB (ST8000VNZ02) is the better long-term choice. It’s also a CMR NAS HDD with 256MB cache and SATA 6Gb/s, but at 8TB it offers far better cost per terabyte than the 2TB drive. This is the one to choose if you’re building a 2-bay, 4-bay, or 6-bay NAS and want fewer drives, less noise than multiple smaller disks, and more space for RAID, surveillance footage, or a growing Plex library. The trade-off is price: at £249 it costs much more upfront, and 8TB drives can be overkill for a small home NAS.

The Seagate IronWolf 10TB (ST10000VNZ00) is the biggest HDD option here and best suited to users who care more about capacity than budget. It’s a 3.5-inch CMR NAS drive with 7,200 RPM and 256MB cache, so it should offer stronger sustained performance than the slower 2TB model, especially in multi-user NAS workloads. It’s ideal for larger RAID arrays, ZFS pools, or media servers where drive bays are limited. The obvious downside is cost: at £337.74, it’s a big jump from the original, and most home users won’t need that much capacity immediately.

If your NAS supports M.2 NVMe storage, the TEAMGROUP MP44 1TB is a different kind of upgrade. It’s not a replacement for bulk storage, but it is dramatically faster for cache, app storage, Docker containers, or virtual machines, with up to 7200/6200MB/s read/write speeds. Compared with the IronWolf 2TB HDD, it’s far quieter, lower latency, and much snappier for OS or workload storage. What’s worse is capacity and endurance for mass storage: 1TB fills quickly, and it cannot replace a RAID HDD pool for media or backups. Choose this if your NAS has NVMe slots and you want speed over raw capacity.

The TEAMGROUP MP44 2TB is the most expensive option here, but also the most practical SSD alternative if you need both speed and some usable capacity. It’s well suited to compact NAS units, mini PCs, or desktop systems where you want fast scratch space, VM storage, or a high-performance SSD cache. Relative to the IronWolf 2TB, it’s vastly faster and quieter, but it lacks the resilience and economical scaling of a proper NAS HDD array. It makes sense for advanced users with a hybrid setup, not for someone who simply needs cheap, reliable bulk storage.