Back in the day with HDD we developed RAID in order to safeguard against device failures. Typically for 6+TB HDDs you wanted 2-disk parity (e.g. RAID-6 or RAIDZ2 with ...
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 ...