When you right-click the backup drive in Disk Management, do you see 'Format' option? If so, please format the backup drive which will lead to data loss and check if there is a drive letter assigned to it.
These pictures are uploaded on a personal folder on your computer; I can't access them. However, follow the steps in the video to upload photos on Flickr: http://youtu.be/_wGNHDntr0g.
Please try to format the drive and share the status.
Thanks and Regards,