I’ve been defragmenting my hard disks once every 3 months ago for about the last 3 years, and it hasn’t ever caused me a problem. It does take quite a few hours, but I just leave it to do its job and that’s that.
But it is really something to worry about? Well it’s never seem to have made a lot of difference to me. Once every so often it does really help – if you are getting very slow boot times, defragmenting is an idea.
But generally, if your computer is up to speed and you aren’t having any slow file issues, I don’t really see the point.
Do you defragment regularly?