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Seagate ST12000NM000J 12 TB failure rate and reliability

B Grade B: Good

Backblaze logged 2,271 drive-years on the Seagate ST12000NM000J from Q1 2023 to Q3 2026, with 1,067 in service at the end of that period. In that time 22 drives failed, an annualised failure rate of 0.97%.

That is 36% lower than the 1.52% average across every drive in the same data, which earns it grade B (good).

Among the 7 graded 12 TB hard drives it ranks 2 of 7 for reliability.

Failures have fallen: 0.28% over the latest 7 quarters against 3.29% before.

Failure rate / year

0.97%

Average, all drives

1.52%

Drives in use

1,067

Drive-years

2,271

Failures

22

Capacity

12 TB

Type

HDD

Model number

ST12000NM000J

Failure rate by quarter

Single quarters with few drive-days swing widely; the overall figure above is the dependable one.

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