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The length of time that electrical power is applied to a device
Power-on hours (POH) is the length of time, usually in hours,[1] that electrical power is applied to a device.
A part of the S.M.A.R.T. attributes (originally known as IntelliSafe, before its introduction to the public domain on 12 May 1995, by the computer hardware and software company Compaq),[2]
It is used to predict drive failure, supported on almost all Hard disk drives and SSDs.
Power-on hours is intended to indicate a remaining lifetime prediction for hard drives and solid state drives. Generally, the total expected life-time of a hard disk is 5 years[3] or 43,800 hours of constant use.[4][5]
Typically, after a disk reaches 5 years or 43,800 hours of power-on time, it is no longer in perfect condition and therefore is more likely to fail. However, some devices can still work perfectly fine. Some devices have even reached more than 10 years of power-on time without showing any problems or errors.[6]
Google tested over 100,000 consumer grade serial and parallel ATA hard disks, finding evidence that S.M.A.R.T. attributes like POH played a heavy role in device failures.[7]
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