Power-On Hours: What the S.M.A.R.T. Value Means
Power-on hours estimate how long a drive has been powered, but age alone does not determine health.
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In this articleIt is an operating-time indicatorOld does not automatically mean badVendor details can differUse it as context
It is an operating-time indicator
The counter provides context for how long a device has been in powered operation.
Old does not automatically mean bad
A drive with many hours can remain healthy, while a new drive can fail early. Health trends and symptoms matter more than one age number.
Vendor details can differ
Do not assume every raw value uses the same unit unless the device documentation supports that interpretation.
Use it as context
Power-on hours can help explain lifecycle history when combined with host writes, media errors, temperature history and workload.
Practical takeaway: interpret storage data in context, protect important files with independent backups, and compare trends rather than relying on a single screenshot.