With the NAS HDD series, Seagate now has hard disks that are optimised for use in NAS devices just like the Western Digital Red disks. The fact that they're in TLER mode by default is important for NAS devices, and it's also positive that Seagate tests the disks with all the major NAS devices.

Where is the NAS. This is just a hard disc.

The arena for NAS-targeted hard drives has just welcomed a second combatant: Seagate's "NAS HDD". Like WD's Red series, NAS HDD is designed to work well with RAID controllers, has improved vibration-reduction, and additional power profiles. Unlike WD's Red, NAS HDD has a 4TB model.

Fantastic performance for a ~5,900 RPM hard drive; Only 4TB option for NAS-specific models (your move; WD); 3-year warranty

A bit more expensive than WD's Red (2TB and 3TB). Seagate's drives are newer; pricing will go down

Though it doesn't perform like a standard drive suitable to be paired with an OS for your primary use, but has all the near-enterprise functionality of a NAS good enough for SOHO use. Best part is that its able to keep up with WD Red 2TB version. Not bad for a 4TB counterpart from Seagate!

Back in July of last year, Western Digital launched the first purpose built NAS hard drive, and for the longest time I was waiting for Seagate to do the same. Today this has come to fruition with the NAS HDD, offered in two, three and four TB capacities.

The Seagate NAS HDD is a 3.5" form factor, 6Gb/s SATA interface hard drive that spins at 5,900RPM, ranges up to 4TB in capacity and is specifically engineered to be installed in one to five-bay NAS devices.

Higher mixed workload and sequential throughput than WD Red; Greatest capacity in NAS HDD segment; Better latency consistency in mixed workloads than WD Red

Back of the group random 4k max latency in write activity