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Can SMART disk details be reset or forged?
Greetings all, I've come across this issue a couple of times in the past but never been able to get the bottom of it so thought I'd see if anyone else had any ideas.
I spun up a new server last week and the first thing I do is to always check the smart details on the drives and nothing looked out of the ordinary apart from this:
9 Power_On_Hours 0x0012 100 100 000 Old_age Always - 174
Which in itself looks good, I managed to bag a new disk! But then if you look at the smart test history all of the tests are showing to have taken place when the drive had 57,000+ lifetime hours to its name apart from the test I ran on the disk which reported it as taking place at 174 lifetime hours:
Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
# 1 Short offline Completed without error 00% 174 -
# 2 Short offline Completed without error 00% 0 -
# 3 Short offline Completed without error 00% 57967 -
# 4 Short offline Completed without error 00% 57945 -
I did consider that perhaps lifetime hours and power on hours are counted differently but that wouldn't then explain why the recent smart test I did on the drive reported the same value for both.
Anyone got any ideas?
Comments
I think drives controller can be flashed with an altered firmware to alter SMART values.
Yes, you can access a console by wiring the TTL to the small pins beside SATA on HDD,
and on some HDD, SMART can be cleared by just a console command.
Power_On_Hours SMART attribute usually wraps back to 0 after 8-9 years or so. No need to tamper with it, it'll happen automatically.
So my poor new drive aged 10 years overnight, sounds like me the last time I attempted to play sport.
It's probably implemented as a 16-bit field and so wrapped round at 65536 hours (about 7.5 years).