How to Upload Files from an External Drive to OneDrive Without Using Internal Disk Space
Question details
The user wants to transfer approximately 500 GB of files from an external hard drive to OneDrive without consuming the limited storage space on their computer's internal hard drive.
- Product
- OneDrive
- Device & OS
- not provided
- Scenario
- Transferring a massive volume of files from an external storage device to cloud storage when the local internal disk does not have enough capacity to hold the intermediate sync files.
- Observed behavior
- Copying files directly into the local OneDrive folder forces the files to be stored on the internal hard drive first, causing the disk to run out of space before the cloud upload can finish.
Verify that your OneDrive cloud account has enough available storage capacity (at least 500 GB) to accommodate the transfer, and ensure your external hard drive is securely connected to your computer.
Use OneDrive Files On-Demand and 'Free Up Space'
Transfer files in smaller batches and use the 'Free up space' feature to remove local copies from your internal drive once they are safely in the cloud.
OneDrive Files On-Demand allows you to view and manage cloud files on your computer without actually downloading them. By moving your external drive files into the OneDrive folder in batches, you can upload them and then instantly free up the internal disk space they occupied.
Click the OneDrive cloud icon in your taskbar system tray, click the gear icon to open Settings, navigate to the 'Sync and backup' or 'Advanced' settings, and ensure 'Files On-Demand' is turned on.
To prevent your internal drive from filling up, copy a small portion of your files (e.g., 20-50 GB at a time) from the external drive into your local OneDrive folder.
Allow OneDrive time to sync these files. You can verify they have successfully uploaded when the sync status icon next to the files changes to a solid green checkmark or a cloud icon.
Right-click the successfully uploaded files or folders in your OneDrive directory and select 'Free up space' from the context menu. This deletes the local copy from your internal drive while keeping the file securely stored in your OneDrive cloud. Repeat this process for the remaining files.
Upload Directly via the OneDrive Web Website
Bypass the local OneDrive sync folder completely to ensure your internal disk is never used during the transfer.
Change the OneDrive Folder Location to the External Drive
If the external hard drive will remain permanently connected to your computer, you can make it the default location for the OneDrive sync folder.
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Frequently Asked Questions
Can I disconnect my external hard drive if I change my OneDrive folder location to it?
No. If you map your primary OneDrive sync folder to an external drive, that drive must remain connected to your computer whenever OneDrive is running. If you disconnect it, OneDrive will display an error stating it cannot find your folder and syncing will halt until reconnected.
Does using 'Free up space' delete my files permanently?
No, selecting 'Free up space' only removes the local downloaded copy of the file from your computer's internal hard drive. The actual file remains safely stored in your OneDrive cloud account and will appear locally as a cloud-only placeholder.
Why does dragging files to the OneDrive folder use my internal hard drive space?
When you drag and drop files into the default OneDrive folder on Windows, the system must create a local copy of those files on your main 'C:' drive to stage them for the upload process. This is why a 500 GB transfer will quickly exhaust the internal disk space before the cloud sync can complete.
