What's the difference between a Mac Shangqing trash and a safe emptying trash?

What's the difference between a Mac Shangqing trash and a safe emptying of the trash? The so-called "safe emptying trash" is the repeated use of random data overlay to save the deleted files, so that you cannot recover purged files using any civil level tool. If you simply "clear the trash", there is a great chance that the file will recover.

If you want to delete more sensitive files, such as electronic bank statements, tax returns, documents that contain ID numbers or passwords, you can choose to have the Mac clear the trash in a safe manner. This option allows the Mac to overwrite deleted files, which greatly reduces the likelihood that others will recover them. This process may take some time, depending on what is deleted

Safe emptying of waste basket

While holding down the trash icon in the dock bar for a long time, the option to "clear the trash" appears in the pop-up menu, and if you hold down the command key, a "safe emptying of the trash" appears in the menu and click on it. You can also open a Finder window first, and then find the "safe emptying trash" option on the Application menu.

Always perform safe emptying of trash

If you want to set the safe emptying trash always, open the Finder window and tap Preferences on the Application menu, and then select the Advanced tab and select the check box next to the safe emptying trash.