I have had a look at device manager and it is still showing the Tape Drive but not the changer. I think this is a driver issue on Windows.
One thing to note, this is a Dell R710 with PERC 800 card (sorry not a 810)
I have updated the drivers to 184.108.40.206 with date 10/4/2013. It still only shows the tape device in Device Manager.
I have checked the post tape-f29/veeam-in-vm-backing-up-to-dell-tl2000-via-iscsi-t17787.html
and followed a few things on there:
Uninstalled from Device Manager and rebooted the server. Still shows up as the single drive.
Refreshed the firmware on the TL2000 to C30 and rebooted this device.
Updated Windows update with all the relevant updates and patches.
Still no joy with this. I cant find any other drivers to install. The only other option is to totally wipe the server and start again but I want to do this as a last resort.