Re scan the disk, format the span volume. Use windows back up to restore the data
Re scan the disk, remove the span volume and create a new span volume that includes the new disk. Format the span volume, use Windows back up to restore the data
Re scan the disk, extend the span volume to include the new disk. Shut down and restart the server, use windows backup to restore the new data
Extend the span volume to include the new disk, rescan the disk
Extend the span volume to include the new disk, shut down and restart the server, use windows backup to restore the data