Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Here is a screen shot:

enter image description here

I have a late 2009 iMac with the following hard drive: Capacity: 500.11 GB (500,107,862,016 bytes) Model: Hitachi HDT721050SLA360 Revision: ST0KA36E

This is happening nearly everyweek, usually overnight when there is nothing happening on it. When i come back in the morning the fan is spinning at over 6100 rpm. Normally it spins at around 1100 rpm.

What is causing this, and how can I fix it?

share|improve this question
    
Have you monitored the hard drive temperatures being reported? If so, what have they been? –  Troggy Oct 27 '10 at 20:30
    
Yes, they are currently at 122(F) with the fan operating at normal speed of 1100 rpm. When it was spinning fast, it was down to around 110(F). –  zm15 Oct 27 '10 at 20:33

1 Answer 1

up vote 0 down vote accepted

Sounds like the system is doing some indexing / updating itself overnight and doing a lot of hard drive activity in the process.

Does the fan speed correct itself?

share|improve this answer
    
No it does not correct it self, and there is minimal activity whenever it happens. There are no programs running when it happens. –  zm15 Oct 29 '10 at 13:03
    
How does the problem get corrected then? On reboot? Something you do in software? –  Joshua Nov 1 '10 at 11:21

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.