How to safely and permanently delete file data under Windows system

Most people always think that Windows permanently deletes files or data, and directly use Shift+Delete key combination. This is certainly not! Imagine if you can delete it permanently, how can there be such a data recovery software and method on the Internet? Now suppose you have a hard disk in your hand that has to be sent to the manufacturer for repair. There are a lot of important confidential information. You should not want to delete it only by Shift+Del, or further think that direct formatting will not be all right. ? Still not! Here to introduce a command line tool, you can permanently and completely delete the data files on the hard disk: sDelete No matter what else, download to the computer is important, download, compress, get the sdelete.exe file. The first run will prompt you to accept the agreement and confirm. After running, nothing happens? Because it is a command line tool, open a command prompt before you can use it to delete files. Support for command line tools has many advantages, small size, free, and flexible parameters for easy batch calling. SDelete refers to the US Department of Defense document deletion standard DOD 5220.22-M. Because the principle is more complicated, we simply explain its operation process, that is, “write all 0s, then write 1 and finally delete” in the file content area. In addition, SDelete also considered the case of compressed files and EFS. SDelete is a command line utility with many options. Follow the appropriate steps to delete one or more files or directories, or to clean up free space on the logical disk. SDelete accepts wildcards as part of a directory or file specifier. Its usage is as follows: sdelete [-p passes] [-s] [-q] sdelete [-p passes] -z [drive letter] Parameter description: