Mac OS X Guest Virtual Box in Windows Host Full Screen

Question

Is there a way to make the Mac OS X guest OS adapt the resolution of the host OS given that there's no guest additions yet as of the moment?

Answer 1

There is no way for it to automatically adjust, but you can specify a custom resolution for the Guest to use.

You can manually edit the VirtualBox configuration, and the boot file in OS X to use a custom resolution. It's a two part (Host VM/Guest) process to enable the resolution.

Here are the steps:

1. First, make sure VirtualBox is not running. Close it if it is.

2. Add the following setting to the section of your VM's XML file:

   <ExtraDataItem name="CustomVideoMode1" value="1680x1050x32"/>

   You can change the value above to your preferred dispaly resolution, e.g. 1280x1024x32.

3. Save the file and start your VM.

4. In Mac open the /Extra folder in the Finder.

5. Drag the com.app.Boot.plist file to the desktop.

6. Open the file on the desktop in the editor.

7. Locate the Graphics Mode entry, following that there should be a xxxxxx entry. Edit this entry to match the Custom Video entry from step 2 above. i.e. 1680x1050x32

8. Restart your VM and the new display resolution should be effective.

Good Luck!