Backblaze: 4 TB HGST and Seagate hard drives are most reliable, 3 TB Seagate and WD drives fail often
What is the Best Hard Drive? — It was one year ago that I first blogged about the failure rates of specific models of hard drives, so now is a good time for an update.
Context & Ripple Effects
A year after its first model-by-model failure-rate post, Backblaze is publishing an annual update from its own fleet: 4 TB HGST and Seagate drives top the reliability ranking, while 3 TB Seagate and WD units fail often enough to stand out. The report lands mid-arc in the industry's capacity push — Seagate had just launched thin 500 GB consumer drives weeks earlier and would follow within eighteen months with helium-filled 10 TB models.
First-order effects
- Buyers running large fleets — cloud-storage operators above all — get a public, model-specific signal that shifts procurement toward 4 TB HGST and Seagate units and away from the 3 TB Seagate and WD SKUs flagged as frequent failures.
Second-order effects
- Drive vendors now compete against their own installed-base failure statistics: Seagate sits on both ends of Backblaze's ranking, so its response leans on next-generation designs rather than marketing — the helium-based 10 TB line it unveiled in 2016 and the recording-tech split where Seagate backs HAMR while WD chose MAMR.
Third-order effects
- If operators keep publishing fleet-wide telemetry, model-level reliability data becomes a standing procurement input that disciplines vendor capacity roadmaps — a dynamic visible years later as HDD makers bet on heat-assisted magnetic recording to defend a data-center market IDC expects to reach $22B by 2028.
The trend: Independent fleet-operator failure telemetry is turning hard-drive reliability from a vendor claim into a public benchmark that shapes procurement even as the industry races toward higher capacities.