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Samsung SSD 980: Wrong "Power On Hours" reported by SMART on Linux

(Topic created on: 02-02-2024 11:28 PM)
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Sourav1
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Hello,

I recently acquired a Samsung 980 500GB SSD and have been monitoring its performance and health through smartctl -x /dev/nvme0 on Linux. I've encountered an inconsistency that puzzles me. Despite my system having an uptime of at least a week, with continuous operation spanning 2 to 3 days at a stretch, the SMART/Health Information reports the power-on hours as only "2".

Here are some relevant details from the SMART/Health Information:

SMART/Health Information (NVMe Log 0x02)
Critical Warning:                   0x00
Temperature:                        46 Celsius
Available Spare:                    100%
Available Spare Threshold:          10%
Percentage Used:                    0%
Data Units Read:                    413,360 [211 GB]
Data Units Written:                 368,021 [188 GB]
Host Read Commands:                 4,841,138
Host Write Commands:                1,587,849
Controller Busy Time:               4
Power Cycles:                       34
Power On Hours:                     2
Unsafe Shutdowns:                   3
Media and Data Integrity Errors:    0
Error Information Log Entries:      0
Warning  Comp. Temperature Time:    0
Critical Comp. Temperature Time:    0
Temperature Sensor 1:               46 Celsius
Temperature Sensor 2:               44 Celsius

Given the discrepancy between the reported power-on hours and the actual usage time, I'm concerned about the accuracy of this report. Could there be an issue with how smartctl interprets the SSD's data, or is this indicative of a different problem? Any insights or advice on how to address this discrepancy would be greatly appreciated.

Thank you for your assistance.

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