How to completely erase the hard disk deleted files in Win10

Usually the files we delete are not really deleted. Using some data recovery tools, it is easy to recover the data. This is also true in the latest Win10 system. If the files you delete involve personal privacy and you are worried that the data will be recovered. What should I do? The method is very simple, please see below.
Operation method:
This function exists in Windows XP, Win7, Win8.1, Win10. The system comes with a command line tool called cipher. Its purpose is to use EFS to encrypt the file system to the file. Encrypt. However, this tool also has an additional feature that can be used to erase the remaining space on the hard disk to safely delete deleted files contained in the remaining space. The tool is very simple to use, as follows:

1, type CMD in the Start menu or taskbar search box to find the command prompt in the search results, right-click and select Run as administrator.
2, at the command prompt, the following command, the transport run:
cipher /w: C

last letter "C" represents the partition letter, can be modified as needed. After that, you only need to wait patiently, as shown below:
To erase data, the tool will perform three tasks in sequence: first, cover the remaining space with 0x00, then cover the remaining space with data 0xFF, and finally use random data. erase. It takes some time to complete the whole process, depending on the amount of free space on the hard disk.
Is it very simple? In addition, if your file has not been deleted manually, you can use the file master in the soft media cube to smash it, and the file master will also use random, blank data to erase the file. This is more efficient when you need to erase a single file. As shown below: