To compact the Windows guest image, use the VirtualBox VBoxManage utility. #VIRTUALBOX WINDOWS IMAGE FREE#When SDelete has finished running and the free space cleaned or zeroed is 100%, shutdown the Windows virtual machine. Once SDelete is running you will see a message similar to the following: SDelete is set for one pass.Ĭleaning free space on c:: 12% Step 4: Shutdown the Windows Virtual Machine Where -c is the SDelete parameter to clean any free space. Where -z is the SDelete parameter to zero any free space. So to zero-fill the virtual Windows disk, type the following at the DOS prompt: C:\> sdelete.exe -z SDelete (or Secure Delete) is a command line utility. Windows does not come with a native utility to zero-fill unused space but you can find the excellent SDelete tool at Microsoft's TechNet: The most effective way to clean free disk space on a Windows drive is to overwrite the unused space with a bitstream of zeros or to zero-fill any free space. These garbage bits and bytes are from the contents of files that used to occupy that space but that are no longer there. button.įollow the steps to defragment the virtual Windows disk.Īfter the disk has been defragmented, the virtual Windows drive will still have unused space containing garbage bits and bytes. Then select the Tools tab and click the Defragment now.
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