Windows 7: Event viewer information survives low level format! Spooky - read on!

I have replicated a strange occurrence involving event viewer data over and over in case I was going insane and I would like to share this story in case someone can explain this spooky occurrence! A while ago I had to use system image restore (windows 7 image restore) to restore my entire system from a backup on my external. Everything went perfect, but one day whilst exploring Event Viewer I noticed some recorded events logged that occurred AFTER my image backup and before the restore. (the very events that clued me into running my image restore in the first place). Intrigued, I low level formatted my C: drive and again reinstalled from my image back up and again all recent events up to the most recent were still there in Event Viewer. How is this possible? Do I need an Exorcism performed on my PC? I have since replicated this multiple times out of share fascination. Any thoughts or priests that I could call on?

What do you mean "low level format" what program are you using? How?

Do you have a 100meg recovery partition in addition to your C drive? (Look at your disk manager and see if there is more than one partition on your physical "C" drive). Information could be coming from there I suppose. Could you possibly not actually be formatting the entire drive but just the existing C partition and leaving the windows 100 meg recovery partition alone?