Erase free space securely in Windows without third party tools

When you delete files in Windows, they can be easily recovered. Windows only marks the file as deleted, but physically the files stay on the hard drive until they are overwritten by new data. Although on an SSD, they are harder to recover than hard drives because of TRIM and garbage collection done by the SSD controller, all of the deleted data is not securely wiped by default. If you deleted some sensitive data and want to be sure that it cannot be recovered before you give your PC away temporarily for whatever reason, here is how to wipe the free space securely without any third party tool.

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