Anecdotal so you don't have to look elsewhere: I can confirm that at least two of my NAS HD drives have rolled over once. Drives usually do nothing and spin up once every two weeks or so. No problems. Though SMART only says 16 bits I also have one drive which has over 16 bit hours of operation reported and is still counting so 16 bit is not universal.
Since I run a SMART test every month it is easy to track the hourly progression (and thus rollover) in the event log as the events are reported in POH timing.
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Anecdotal so you don't have to look elsewhere: I can confirm that at least two of my NAS HD drives have rolled over once. Drives usually do nothing and spin up once every two weeks or so. No problems. Though SMART only says 16 bits I also have one drive which has over 16 bit hours of operation reported and is still counting so 16 bit is not universal.
Since I run a SMART test every month it is easy to track the hourly progression (and thus rollover) in the event log as the events are reported in POH timing.