How do I increase the size of the virtual disk in Virtualbox?

Q: How do I increase the size of the virtual disk in Virtualbox?

A: The same command is used on both Windows and Linux. Below is an example for Windows, using a CLI-command.

Note that the command(s) are all typed on one row!

Windows:

c:\ >"C:\Program Files\Oracle\VirtualBox\VBoxManage" modifyhd "d:\VMs\CentOS v5 x64 Clone.vdi" --resize 40960

Linux:

# cd /home.2TB/VMs
# vboxmanage modifyhd "Win7 Pro SP1 x64.vdi" --resize 40960