Yes, you can connect OneDrive to an external hard drive or another partition on the same computer.
Yes, you can connect OneDrive to an external hard drive or another partition on the same computer.
Yes, it is possible to sync your data from local disk C to local disk D on your OneDrive. You can use OneDrive’s built-in synchronization features or third-party tools to transfer files between the disks. Simply ensure both drives are connected and follow the appropriate steps in OneDrive settings.
Since you say synchronize, I assume you want future changes to the data to be reflected on the D drive? Or is this a one time thing? Do you want data to be synchronized both directions? In any case, using OneDrive for that purpose doesn't make sense. It is designed to synchronize data on one computer with the cloud (and possibly other computers). What you want sounds more like a backup solution.
Check if your OneDrive works on both disks, covering both C and D. Ensure folders on either drive sync automatically to the cloud. Can you confirm this setup?