Linux Mount notes: Mount some minor problems mount:no medium found On/dev/sr0__linux

I belong to the Window+vm+ubuntu configuration and sometimes I need to mount the files on Windows to the virtual machine. Then each time you use the command, the following problems occur:

It's easy to solve the problem, but it takes a long time because of my carelessness:

This time, be sure to confirm that the virtual machine settings are selected as shown in the following figure:

Then follow the instructions below: Mount/dev/cdrom/mnt/cdrom's command is OK (Ps:/mnt/cdrom's CDROM is established by himself)