All the info here is from here and here
1)Defrag the drive within windows. Using something like Defraggler
2)Zero the free space using SDelete command line is sdelete –z C:\
3)Compress using VBox tools VBoxManage modifyhd –compact nameofimage.vdi
All the info here is from here and here
1)Defrag the drive within windows. Using something like Defraggler
2)Zero the free space using SDelete command line is sdelete –z C:\
3)Compress using VBox tools VBoxManage modifyhd –compact nameofimage.vdi