As soon as it finishes this process, shut down your Windows guest and VirtualBox. Zeroing free space means fill up all the free space with zeroes, so they can be removed and reclaimed later on.ĥ. The -z flag instruct it to zero free space, which is required for virtual disk optimization. Next, open the command prompt and cd to the SDelete folder. You should find 3 files in the folder: Eula, sdelete and sdelete64. Extract the SDelete utility to the Desktop. This is a command line utility to securely delete files from the system. If your guest OS is Windows 10, just search for “defragment” in the Start menu and open “Defragment and Optimise Drives” option.Ĭhoose the disk you want to defragment and click “Optimise”.ĭownload the SDelete file. The goal is to free up as much space as you can from inside the guest OS. Uninstall all unwanted applications and remove all unnecessary backups (like Windows.old, old Windows restore points, etc.). Go to the Recycle Bin inside your guest OS and delete all the unnecessary files.
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