Tablet PC Blogs

It looks like further investigation is needed.  Is the space being taken by the directory structure, or the actual files within the directories therein?  Consolidation, compression, alternate storage locations or deletion might be required.
I am a little unsure of how One Note utilizes directory space, or for that matter file space, however, I would imagine that inked files do take up more space than type-written text.  It might also be of interest to take a look at the other files that might exist, such as audio or video files, which  may be associated with any One Note documents.

Good Luck

The next time you're trying to find what's eating up your disk space, take a look at DriveScan from Stardock (it's part of their Object Desktop suite of tools). It scans your entire disk and draws a really handy pie chart (you can drill down into the folders) that makes it real easy to see, at a glance, what is taking the most space.

If you're daring, what I'd probably do next is zip up the entire OneNote folder under Application Data, and then delete everything that looks like a cache. Then fire up OneNote and see if anything is missing. I'm going to guess that OneNote will rebuild anything it needs in that folder. Although, you might lose any "Unfiled Notes" since I'm going to guess those are stored under Application Data, since they're not in your official Notebook hierarchy.

Worst case, you'll have to unzip the folder and put it back the way it was before. :)

My folder is less than 50 MB, by the way... and I've got quite a lot of stuff in my notebooks (including many audio recordings). But, I tend to keep on top of my Unfiled Notes, either filing them or deleting them, as the case may be.

Good luck! Let us know what you find out.

Ken

You're right, I didn't believe you. I do think it's important to track this down though. I know you've printed thousands of pages of pdf docs as part of your everyday note-taking. Any further info?