Power-on hours
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 are used to predict drive failure, supported on almost all hard disk drives and SSDs.[2]
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]
References
- ↑ "ZAR - Quick guide to understanding S.M.A.R.T. information". https://www.z-a-recovery.com/manual/smart.aspx. "...the raw value of the attribute is stored using all sorts of measurement units (hours, half-hours, or ten-minute intervals to name a few) depending on the manufacturer..."
- ↑ "The Emergence of Reliability-Prediction Technology" (PDF) (Press release). 2001-06-12. Archived from the original (PDF) on 2001-06-12. Retrieved 2018-02-01.
- ↑ "S.M.A.R.T. Attribute: Power-On Hours (POH) | Knowledge Base". https://kb.acronis.com/content/9109.
- ↑ "Power on time". https://www.hdsentinel.com/help/en/54_pot.html.
- ↑ Hepworth, Shelley (2022-02-11). "Most hard drives have a lifespan of three to five years. Have you checked yours lately?" (in en-GB). The Guardian. ISSN 0261-3077. https://www.theguardian.com/technology/2022/feb/12/most-hard-drives-have-a-lifespan-of-three-to-five-years-have-you-checked-yours-lately.
- ↑ "Facebook". https://www.facebook.com/photo/?fbid=3814292722032664&set=a.157734857688487.
- ↑ Pinheiro, Eduardo; Weber, Wolf-Dietrich; Barroso, Luiz André (2007). "Failure Trends in a Large Disk Drive Population" (in en). Google Inc.: 17–29. https://research.google.com/pubs/pub32774.html.
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