f:
> I realise you had it set to off
Because that's what he (and many others) wanted.
> this information may help to decide which settings best suit you
The best setting for defragmenting is off.
That allows the user, not some program set to auto, to decide when it should run.
> If you start using your computer again, Norton Internet Security stops the optimization task, and starts optimizing the next time that your computer is idle.
Which means that the user could have been doing absolutely anything in the meantime: installing software, uninstalling software, copying files, deleting files, etc.
I prefer to manually start defrag and let it run to completion without "confusing" it. lol
The average user has no need to run defrag a) automatically or b) often.
On a computer that I use daily, I manually run defrag quarterly. The last time I ran it, the pre-analyze feature said that it was only 4% fragmented. Hardly worth it, but since I have multiple computers to use, I did it anyway. Quarterly.
And it is better to use a product that is superior to MS's default product, defrag.exe, which NIS calls.
There is consensus that Defraggler is better than MS's. Get it from www.piriform.com, not from some third party website. The free version is fine.