Introduction When working with files in SharePoint, the drive ID and drive item ID are essential parameters for further manipulation using Microsoft Graph API. The drive ID is a base64 encoded string composed of the site ID, web ID, and list ID for a particular SharePoint library. For more details, refer to Microsoft Graph: Encoding and decoding the drive ID by Mikael Svenson. The item ID part appears to be a base32 encoding of the SharePoint item’s unique ID, though the exact mechanics are still being explored.