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https://hoursfinder.com/s-hours/seagate-smart-power-on-hours.html
Normalized Power On Hours = 100 - (PowerOnHours / (HOURS_PER_YEAR / 10)). This will decrement by one for each 1/10 of a year and will go to minimum value in 10 years. Raw Usage Raw [3 – 0] = Total # of power-on hours ... Seagate SMART Attribute Specification
https://kb.acronis.com/content/9109
Description. Power-On Hours (POH) S.M.A.R.T. parameter indicates a count of hours in power-on state. The value of this attribute shows total count of hours (or minutes, or seconds, depending on manufacturer) in power-on state. A decrease of this attribute value to the critical level (threshold) indicates a decrease of the MTBF (Mean Time Between Failures).
https://forums.tomshardware.com/threads/why-is-power-on-hours-raw-values-so-high-on-my-new-seagate-hdd.3664890/
For example, Power On Hours appears to consist of two numbers: 0xC6CF00000020 -> 0xC6CF 0x00000020. The lower number is 0x20 which is 32 in decimal. That's the actual number of hours. I suspect that the upper 16 bits (or 20 bits) might be …
https://serverfault.com/questions/570756/smart-power-on-hours-attribute-for-different-hdd-manufacturers
Power_On_Hours Attribute of my new Intel SSD reports ~890000 hours. This is a bug in Intel 330 Firmware 300i and Intel 520 Firmware 400i. The offset is 894794 hours. See also ticket #289 and Intel SSD Toolbox SMART Attributes FAQ.
https://forums.unraid.net/topic/43111-smart-hdd-power-on-hours-77086-9-years/
I suppose anything's possible, but I've never seen it on ANY disk ... Seagate, WD, Hitachi, Maxtor, Toshiba, Samsung, or any other drive I've ever had. And note that the parameter is called "Power On Hours". In addition, if it WAS in minutes, then it's showing less than 54 days of power-on time [77170 / 60 => 1286.17 hours ...
https://www.reddit.com/r/synology/comments/d6mvsw/can_smart_power_on_hourspower_cycle_count_be/
I bought a pair of Seagate IronWolf 6TB drives yesterday. I've installed them today in a DS718+ and before start creating Volume I went for a SMART test. My surprise is that Power-on time on both drives is not near to zero, is 8.220 hours! Also, Power Cycle Count is 31 and 32 for "Brand new" drives that I've installed half an hour ago.
https://www.seagate.com/support/kb/annualized-workload-rate-005902en/
With this data we can calculate an Annualized Workload Rate using this simple formula: Annualized Workload Rate =. (Lifetime Writes + Lifetime Reads) * (8760 / Lifetime Power On Hours) 8760 are the number of hours in a year. The Workload Rate becomes an annualized average expressed as TB/year.
https://en.wikipedia.org/wiki/Power-On_Hours
It is used to predict drive failure, supported by manufacturers such as Samsung, Seagate, Toshiba, IBM , 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" [3] or 43,800 hours of constant use.
https://hardforum.com/threads/post-your-hard-drive-power-on-hours.1915865/
[09] Power-On Hours/Cycle Count: 1/Always OK, Worst: 1 (81584 hours / 9.31 years) Drive Model: Seagate ST3500630AS (not bad for a 40 dollar hard drive from fry's back in 2007 but it's my last surviving one of 6.. 2 of the 6 died after 1 year and the remaining 3 died about 3 years ago) [09] Power-On Hours/Cycle Count: 26/Always OK, Worst: 26 (65497 hours / 7.48 years)
https://www.truenas.com/community/threads/alerte-critique-temp%C3%A9rature.84392/
Je planifie aussi des tests SMART long une fois par mois et des SMART courts toutes les semaines pour chaque disque. HP DL380G6 - Xeon X5670 - LSI flashed HBA - 6x4TB RAIDz2 FreeNAS 9.10.2 as VM - 64GB RAM - 8vCPU
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