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Seagate IronWolf Pro vs WD Red Pro 20TB

There's nothing clear-cut between them on paper, so buy whichever's cheaper on the day.

Compared on 7 specs from the makers' datasheets, and a group only gets a winner when the gap between the two is clear-cut.

Side by side

SpecSeagate IronWolf ProWD Red Pro
Reliability Backblaze doesn't run either
Backblaze failure rateLifetime, 95% interval in brackets No data No data
Warranty and workload Level
Warranty 5 years 5 years
Workload ratingReads and writes a year 550 TB/yr 550 TB/yr
Where it fits Level
Line NAS Pro NAS Pro
Rated NAS bays Any number Any number
Recording CMR CMR
Noise and speed Level
Spindle speedFaster reads quicker, slower is quieter 7,200 rpm 7,200 rpm

The Backblaze figures are lifetime annualised failure rates (Source: Backblaze), and we only call reliability when the two 95% intervals don't overlap.