I have a virtual machine which has microsoft OS installed in which i have assigned 25Gb and and have make two partitions inside it. So the C drive is getting full i wanted to increase further 5gb so i saw command to modifyhd HD and the command was " VBoxManage modifyhd ".vdi..." resize --30720
but after this command though it was successful and even in virtual box setting the storage shows its 30gb now but inside the host machine it is not showing in disk management. still showing same 25gb and not even unallocated 5gb available. what should i do now?