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| Gets reset few times a week |
Posted by: Yoshihide on 2009-08-20 05:55:33
Does anyone have a clue to why the "Hours of Use" (the one you get in TechTool) gets reset a few times a week?
It should display something like 43000 hours since 2004/3/19, but about once or twice a week, TechTool would display 30 hours since 2004/3/19.
Since the manufacture date (2004/3/19) doesn't get reset, and only the hours of use, I'm guessing it's not the PRAM battery.
Has anyone experienced similar problems?
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Posted by: Yoshihide on 2009-08-24 07:21:11
Seems like the PRAM Hours of Use parameter won't record anything above 43690 Hours. After that, it returns back to 0.
Is there a limit to how much hours the PRAM can record? 43690 Hours seems quite an odd number to me.
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Posted by: ~Coxy on 2009-08-24 20:20:25
43690 hours = 2621440 minutes.
That makes me guess that somewhere in the PRAM is 18 bits for the total uptime count, which gets incremented every 10 minutes.
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Posted by: Nico on 2009-08-26 01:28:17
And then after reaching that number, the counter overflows and goes back to zero automatically. It's the same problem the Unix timestamp will face in 2038 on 32-bit computers.
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