Add additional disk to Vagrant host

additional_disk_to_vagrant.rb

Vagrant.configure("2") do |config|
  config.vm.box = "base"
   
  # strat with Vagrant configuration v2 need specify VM provider
  config.vm.provider :virtualbox do |vb|
    file_to_disk = '/tmp/large_disk.vdi'
    # disk size 50GB
    vb.customize ['createhd', '--filename', file_to_disk, '--size', 50 * 1024]
    vb.customize ['storageattach', :id, '--storagectl', 'SATA Controller', '--port', 1, '--device', 0, '--type', 'hdd', '--medium', file_to_disk]
  end
end

Thank you for this useful gist, but i have changed the controller name from 'SATA Controller' to 'SATA' to get it working with my new version of VirtualBox (version 4.3.4).
To check the correct controller name type in the command line :
VBoxManage showvminfo the_vm_name | grep 'Storage Controller Name'

Enjoy.