Fix OneNote for Windows 10 Filling Up Hard Drive & Disk Full Error
Question details
The user is experiencing rapid depletion of their C: drive storage while using OneNote for Windows 10, eventually resulting in a disk full error.
- Product
- OneNote for Windows 10
- Device & OS
- Windows 10
- Scenario
- Typing notes and inserting images into open notebooks.
- Observed behavior
- The application creates massive local cache files that consume all available system drive space, rendering the computer unusable until space is temporarily freed by restarting.
Before attempting a fix, ensure all your recent OneNote edits are fully synced to the cloud by checking the sync status icon, preventing any data loss during the app transition.
Switch to the Microsoft 365 Desktop Version of OneNote
OneNote for Windows 10 has a known caching behavior that fills the system drive. Switching to the standard desktop version (formerly OneNote 2016) resolves this issue and allows cache customization.
All OneNote versions use a locally cached copy of every open notebook so you can work offline. However, OneNote for Windows 10 limits your ability to manage this cache. The most reliable workaround is migrating to the full desktop version.
Go to the Microsoft Store or your Microsoft 365 portal and download the standard 'OneNote' desktop application (previously known as OneNote 2016).
Make sure your notebooks in OneNote for Windows 10 are completely synced to OneDrive, then close the application.
Launch the newly installed OneNote desktop application, sign in with your Microsoft account, and open your notebooks from the cloud.
Change the Default Cache Location to Another Drive
Once you are using the OneNote desktop application, you can prevent your C: drive from filling up by moving the cache folder to a secondary drive.
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Frequently Asked Questions
Why is OneNote for Windows 10 taking up so much space?
OneNote creates local cache files of every open notebook so you can work offline and load pages quickly. However, a known bug in OneNote for Windows 10 can cause these temporary files to grow uncontrollably, especially when pasting images, filling up the system drive.
Does OneNote for Windows 10 save files locally or in the cloud?
While OneNote for Windows 10 stores the primary master copies of your notebooks in the cloud via OneDrive, it always keeps a hidden, locally cached copy on your C: drive to facilitate fast loading and offline editing.
Can I change the cache location in OneNote for Windows 10?
No, OneNote for Windows 10 does not have a built-in feature to change the cache location. To save cache files to a secondary drive (like D:), you must switch to the Microsoft 365 desktop version of OneNote.
Will resetting OneDrive fix the OneNote disk full error?
Resetting OneDrive might temporarily free up some space, but it is not a proper or permanent fix. OneNote manages its own cache file independently and does not use the local OneDrive client software.
