I know that hard disk life is always different but on average will it last longer if you turn your computer off as much as possible or is it better to leave your computer always running?
I bought a Seagate 160BG drive that died within 3 months. I had too RMA it.
On the otherhand, I have the IBM Deskstar 75 GXP 60GB HD (yes the dreaded "DEATHSTAR") from 1999/2000 and it is still alive and kicking with no lost data. I can't say the same for Seagate, Western Digital, and Maxtor.
I think its a combination of factors:
The amout you use it and to a certain extent how you use it eg for games or for office work etc.
A bit of luck some ppl who own maxtor hds are happy some are not (im happy)
How you have handeld your hd ie if its been bumped is it in an external enclosure does it have a fan to cool it down etc etc.
Ive never seen a HD with a massive life time warranty, usually they are covered by a 2 or 3 year warranty.
Back ups are still the best way to go.
MTBF is massive these days. Early drive failures are because of misuse or anomaly
*whimpers away*