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Power-on hours

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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, 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),

It is used to predict drive failure, supported by manufacturers such as Samsung, Seagate, Toshiba, IBM (Hitachi), Fujitsu, Maxtor, Kingston and Western Digital.

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" or 43,800 hours of constant use.

Typically, after a disk reaches 5 years of power-on time, the disk is more likely to fail. Some drives can still work perfectly fine even after 43,800 hours had passed, and some have even reached 10 years or more without any problems.

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.

References

  1. "ZAR - Quick guide to understanding S.M.A.R.T. information". www.z-a-recovery.com. ...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...
  2. "The Emergence of Reliability-Prediction Technology" (PDF) (Press release). 12 June 2001. Archived from the original (PDF) on 12 June 2001. Retrieved 1 February 2018.
  3. "S.M.A.R.T. Attribute: Power-On Hours (POH) | Knowledge Base". kb.acronis.com.
  4. "Power on time". www.hdsentinel.com.
  5. Hepworth, Shelley (11 February 2022). "Most hard drives have a lifespan of three to five years. Have you checked yours lately?". The Guardian. ISSN 0261-3077. Retrieved 3 August 2024.
  6. "Facebook". www.facebook.com. Retrieved 3 August 2024.
  7. Pinheiro, Eduardo; Weber, Wolf-Dietrich; Barroso, Luiz André (2007). "Failure Trends in a Large Disk Drive Population": 17–29. {{cite journal}}: Cite journal requires |journal= (help)


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