VirtualBox y VMWare: convertir multiples vmdk a vdi

Referencias:

• http://thedarkmaster.wordpress.com/2007/03/12/vmware-virtual-machine-to-virtual-box-conversion-how-to/

For multiple vmdk files, install the VMware Server then use:
vmware-vdiskmanager -r source_multiples.vmdk -t 2 single_file.vmdk
Now you have on single vmdk.