Drive Age & Power-On Hours Analyser

How this reads your output

Power-on hours are converted into years under two assumptions, continuous running and an eight-hour working day, because the same figure means very different things for a NAS and a desktop. Power cycle and load cycle counts are read where present, since load cycles wear the mechanism independently of running hours and a drive with aggressive head parking can exhaust its rating years before its hours suggest.

What the results mean

If it ran continuously

Hours divided by 8,760. This is the right reading for a server, a NAS or anything left on.

If it ran an 8-hour day

The same hours spread across working days. The right reading for an office desktop, and it makes an apparently old drive look much younger.

Load cycle count

Head parking events, rated at 300,000 to 600,000 on most drives. A high count on a low-hours drive means aggressive power management rather than heavy use.

Common problems and fixes

A used drive claims low hours but looks worn

Check whether the hours are plausible against the power cycle count and the manufacture date on the label. Some tools can reset SMART attributes, though it is uncommon and usually leaves other counters inconsistent. A drive with 500 hours and 40,000 power cycles has been switched on and off far more often than it has run.

Load cycle count is enormous on a nearly new drive

Aggressive head parking, which some drives do by default and which is far too aggressive for a drive that is accessed regularly. Vendor utilities can change the idle timer on many models. It is worth doing, because the count can reach a rating designed for years of life within months.

Frequently asked questions

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