Will replacing my existing laptop hard drive affect my iTunes/iPhone?

I'm pretty sure I already know the answer but with me possibly losing my data from the main 2 devices I use in life I want to be sure.

I've made a system image using windows 7's built-in backup software and will be replacing my faulty hard drive with a larger capacity new one. Seeing as it's a full system image it should save all the iTunes program data, settings, media (songs/videos) and iPhone backup shouldn't it?

I think its all down to what settings you ticked when you did the image.

Personally i would specifically backup those areas from your current drive you are most worried about.

From personal experience, reliance on supposed backups, its worth the extra time as security and peace of mind to do.