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ChatGPT is often misleading, or even completely wrong.


For NAS and server drives the power on time would normally be "24 x 365 x the number years the drive has been in the NAS or server". So it's impossible for a drive to have "the power on time is beyond the usual lifetime of a disk when it's running for > 5 years".


Spin up time is just the "number of times you've rebooted the NAS x how long it takes the drive to spin up".


The SMART attributes to monitor, according to BackBlaze, are:

 

Attribute
Description
SMART 5
Reallocated Sectors Count
SMART 187
Reported Uncorrectable Errors
SMART 188
Command Timeout
SMART 197
Current Pending Sector Count
SMART 198
Uncorrectable Sector Count


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