when using virtualbox, you sooner or later come to ask „what harddisk format should i choose?“
SHORT: GO FOR VDI! EVERYTHING ELSE IS NOT PROPERLY SUPPORTED!
Want to know why? Keep on reading:
vmdk: is the VMWare „default“
vdi: Is the virtualbox default.
so you might think „hey if virtualbox can do both, why not choose vmdk and be flexible, maybe i want to move th VM to another virtualization system (VMWare, Citrix) and its easier with vmdk“.
i just say: „INCONSISTENCY BETWEEN GRAIN TABLE AND BACKUP GRAIN TABL“
… and off you go, googlin‘ your ass off… vmware tools… blabla.
You know what happens if you would have choosen to go with the *.vdi format?
A gentle message of VirtualboX „the machine execution has been suspended…. please free some harddisk space“.
And after freeing some space, the machine keeps running as if there was nothing….
Fazit: If you go VirtualBox… go VDI.
(I have not tested this problem with the other formats)