Which is better for a two-bay NAS?

The Seagate two-pack, because it gives you two matched 28TB drives in one purchase. The WD Red Pro is a single drive, so you would buy two.

Which drive has the bigger cache?

The WD Red Pro lists 512MB. The Seagate listing says 512MB in its specs but 256MB in its description, so confirm before buying.

Is the WD Red Pro worth $299.99?

That is far below its $672.55 price on November 2, 2026, so it is a strong price for a 7200 RPM NAS drive with 512MB cache. Check the Seagate kit's per-drive price before deciding.

Seagate rates the IronWolf Pro at 2.5 million hours MTBF and 550 TB/year. WD does not publish those figures for the Red Pro on this listing, so the Seagate has the clearer endurance claim.

Which handles power loss better?

The WD Red Pro, which lists ArmorCache protection for emergency power-off. The Seagate listing does not mention an equivalent feature.

They are close. Seagate claims up to 270 MB/s sustained; WD claims up to 267 MB/s read and 238 MB/s write.

Seagate IronWolf Pro 28TB NAS Hard Drive vs WD Red Pro NAS Hard Drive

Buy the Seagate IronWolf Pro two-pack if you need two large NAS drives and want the lower cost per terabyte. Buy the WD Red Pro if you want a single drive, a 512MB cache, and ArmorCache protection for power loss. The Seagate pair is priced as a kit, while the WD Red Pro 28TB-class drive is $299.99 at Newegg as of November 7, 2026, down from a high of $672.55 on November 2.

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