If you are building massive topologies (e.g., 50+ routers for CCIE studies), seeing "virtual device serial0 will start disconnected" for every single router can clutter your console logs. Here is how to mute or manage it:

Starting with VMware Fusion 13.5 and Workstation 17.5 , VMware officially retired , a legacy technology that mapped printers via a virtual serial port (serial0). Because the software no longer supports the "thinprint" file type, it flags it as an invalid value and tells you the device will start disconnected.