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Can OneDrive Sync to an External Drive on Mac?
Question details
The user is attempting to configure a 1 TB external drive as the primary sync location for both personal and business OneDrive accounts on a Mac mini, but the setup is rejected because the drive is detected as removable media.
- Product
- Microsoft OneDrive
- Device & OS
- Mac
- Scenario
- Trying to save local storage space on a Mac mini by routing OneDrive synchronization directly to a high-capacity external hard drive.
- Observed behavior
- OneDrive refuses to use the selected external drive as a sync folder location, displaying an error that the drive is removable, which prevents the synchronization setup from completing.
Before attempting to modify your OneDrive sync location, ensure your Mac's internal drive has enough space to initialize the default sync process, and verify your external drive is connected directly to a high-speed port on your Mac mini rather than a USB hub.
Use the Internal Drive with Files On-Demand
Since OneDrive officially restricts syncing to removable drives to prevent data corruption from sudden disconnections, using the internal drive with the 'Files On-Demand' feature is the safest and recommended way to save local space.
OneDrive classifies most external USB drives as removable media. If an external drive is unexpectedly disconnected during a background sync, it can lead to severe data corruption or complete synchronization failure.
To bypass the need for external storage, you can keep your OneDrive folder on your Mac's internal drive but instruct the app to store files in the cloud only.
Click the OneDrive cloud icon in your Mac menu bar, click the gear icon for 'Help & Settings', select 'Preferences', navigate to the 'Account' tab, and click 'Unlink this Mac'.
Sign back into your OneDrive account. When prompted to choose the OneDrive folder location, leave it at the default internal drive path (usually your user folder).
Finish the setup, then open OneDrive Preferences again. Go to the 'Sync and back up' tab, expand 'Advanced settings', and under 'Files On-Demand', select 'Free up disk space' to ensure your files remain in the cloud and do not consume your Mac's local storage.
Format External Drive to APFS (Workaround)
Formatting your external drive to Apple's native APFS file system can sometimes prevent macOS from classifying it as a generic removable drive, potentially allowing OneDrive to accept it as a sync location.
Experience Flexible File Management with WPS Office
If OneDrive's strict sync restrictions on Mac are slowing down your workflow, consider using WPS Office. It provides a lightweight, highly compatible alternative to Microsoft Office, featuring built-in cloud capabilities that make saving and managing your documents across local and external drives incredibly seamless.
- 1. Download WPS Office: Visit the official WPS website to download the free installation package for macOS.
- 2. Install and Launch: Drag the WPS Office icon to your Applications folder, launch the app, and sign in to claim your free cloud storage.
- 3. Manage Files Flexibly: Open your Microsoft Office formats directly from your external drive, edit them smoothly, and save them wherever you prefer without facing removable drive errors.
Frequently Asked Questions
Why does OneDrive say my external drive is removable on Mac?
macOS communicates the hardware properties of external drives to applications. USB flash drives, SD cards, and many standard external hard drives (especially those formatted as exFAT or FAT32) are classified as ejectable or removable. OneDrive reads this status and restricts syncing to prevent data corruption in case the drive is unplugged.
Can I use an SD card for my OneDrive sync folder on a Mac?
No, OneDrive officially does not support SD cards or USB flash drives as synchronization locations. Because these storage mediums are inherently designed to be removable, OneDrive blocks them to ensure data integrity during continuous background syncing.
How can I save space on my Mac if I can't use an external drive for OneDrive?
You can utilize the 'Files On-Demand' feature in OneDrive. This feature keeps your files securely stored in the cloud and only downloads a small placeholder to your Mac's internal drive. The full file is only downloaded when you double-click to open it, drastically reducing local storage consumption.
