Eject a virtual CD (VCD) to disconnect it from a virtual machine (VM). Ejecting a VCD allows you to insert another VCD into the VM. It also makes the VCD available for inserting into another VM.
To eject a VCD from a VM
Unmount the VCD from the guest operating system to ensure that it is not in use.
On the Virtual Machines page, select a VM.
Click the CD Drives & USB Devices tab in the lower frame.