Failure rate or base failure rate refers to the number of failures per unit of time, typically in terms of failures in time (FITs) equivalent to one failure in a billion hours, which can be expected ...
From the 178,166 HDDs that Backblaze owned as of the end of June 2021, a total of 177,935 HDDs, excluding models for testing and less than 60 units, had a failure rate in the second quarter of 2021.