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Fix OneDrive Files Still Accessible After Disconnecting Mac External Drive
Question details
The user wants to know why OneDrive files are still available on their Mac after quitting the application and safely ejecting the external SSD where the files are stored.
- Product
- OneDrive
- Device & OS
- macOS
- Scenario
- Using an external SSD to store the OneDrive synchronization folder on a Mac.
- Observed behavior
- Files remain locally accessible on the Mac's internal drive instead of being isolated to the external drive, indicating that files are being cached or duplicated locally.
Before troubleshooting, open Disk Utility on your Mac to verify the exact format of your external drive, and ensure all ongoing file synchronizations are paused to prevent data loss.
Verify and Reconfigure the External Drive Format
Ensuring your external SSD is formatted correctly prevents OneDrive from defaulting to local storage fallbacks.
OneDrive requires specific drive formats to synchronize correctly on macOS. If the drive is not formatted properly, OneDrive may fail to utilize it fully and fall back to caching files on your local Mac drive.
Click on 'Finder', navigate to 'Applications', open the 'Utilities' folder, and double-click 'Disk Utility'.
Select your external SSD from the left sidebar. Look at the information pane to confirm it uses a GUID Partition Map. The format should be non-case-sensitive, such as 'APFS' or 'Mac OS Extended (Journaled)'.
If the drive is case-sensitive or uses an unsupported format, back up your existing data, click the 'Erase' button in Disk Utility, and select 'Mac OS Extended (Journaled)' with a 'GUID Partition Map'.
Adjust Files On-Demand and APFS Settings
Modify macOS storage behaviors to understand and control how Files On-Demand caches data.
Unlink and Reinstall OneDrive
Resetting the OneDrive application clears conflicting folder configurations and forces a fresh setup on the external drive.
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Frequently Asked Questions
Why does APFS cause OneDrive files to duplicate locally on my Mac?
With macOS Ventura and later, OneDrive utilizes the Apple File Provider extension. When using an APFS formatted drive, this architecture forces 'Files On-Demand' to create a local synchronization cache on your Mac's internal drive. Files are stored there temporarily before syncing to the cloud and the external drive.
Which external drive format is best for OneDrive on Mac?
For optimal synchronization without case-sensitivity issues, it is recommended to use 'Mac OS Extended (Journaled)' or 'APFS' with a 'GUID Partition Map'. Both must be non-case-sensitive to avoid sync errors.
Can upgrading my macOS affect OneDrive external drive synchronization?
Yes. Significant changes to file system architecture, such as the transition from Big Sur to Monterey or Ventura, altered how cloud storage apps interact with external drives. The newer Apple File Provider extension dictates that cloud storage domains must reside in the hidden Library folder, which changes how external drives behave.
How do I stop OneDrive from using my Mac's internal storage when using an external drive?
Because of Apple's recent File Provider API changes, a small local cache is mandatory. However, you can minimize internal storage usage by regularly right-clicking your OneDrive files in Finder and selecting 'Free up space' to remove the local cache while retaining the files in the cloud.
