[citation][nom]micmic[/nom]No, I don't turn off my computer - bad thing is that I have a PSU and 2 hard drive busted due power surge or blackout - also my BIOS got corrupted when leaving the system 24/7 due to blackout - I have this setup at home -
http://www.geocities.com/justanimation2k5/1234.jpg 250GB each drive.[/citation]
Now this is one more thing why I turn off my computer. I don't like the thought of something gone wrong while I'm gone. Power failures and power surges, stuff like that..
And as people already said - cost of "always on" (both power, and UPS) is just way too high. And certainly larger than POSSIBLE HDD or fan failer that would be caused by turining on/off.
Oh, and to add to all those comments - in all my life I had just one HDD fail (and it was that "suspicious" batch of IBM drives that were all over news in its days), and one fan fail (which died after like 7 years). So I doubt that all this "wear and tear" has any base.
Besides, manufacturers do state the time that device as fan or HDD is intended to work fine (MTBF), but haven't seen any drives that state "you can turn this device on/off only 1000 times". Seen it on rewritable discs only
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