No CD Rom Drive letter

I haven't got a CD Rom Drive visible along side the rest of the Drives.It shows in Total Commander and Explorer OK.I use Windows 7 Pro 64bit.The Rom drive works OK.In Disk management it says No Media .Maybe it's a Windows problem but it does show in the other File Managers.I've just started using Directory Opus so I don't know if I'm missing a setting.

By default, Opus won't show it if no disc is in it, and the disk management screenshot shows no disc in the drive.

I see what you mean I put a disk in and the Drive letter appeared.Your help is much appreciated.
Thank you