The vast majority of Windows computer users think that to delete a file or a folder, simply place it in the system’s bin and empty it. Well, it’s wrong, because using this method, the document always stays on the hard drive.
Thus, an attacker could (fairly easily) recover data that you thought you had permanently deleted for reasons of confidentiality, for example. In fact, there are tools to recover data that the user thought he had deleted and that some people could use to achieve their goals.
Also, here’s how to permanently delete the most sensitive data and then protect them from the curious.
The solution to permanently delete data stored on a hard disk contained in a computer that you would like to get rid of, is to overwrite the newly deleted files with meaningless text.
To do this, we recommend using the Eraser software. Available for free on the Internet, this program uses an algorithm that writes information about the occupied space by
saving the files that you want to delete.
The operation is repeated several times, which makes it possible to guarantee inaccessibility to previously recorded information. To download Eraser, go to the publisher’s website.
Click on Download. Then click on the link for the latest version of the program
Once you have downloaded the installation file to your computer’s hard drive, double-click to start the procedure.
On the next page, select the complete software installation by clicking on the corresponding button and then click Next.
Seconds later, the program is installed on your computer and fully functional.
Check the Execute Eraser box in the last installation panel to immediately start the tool.
There are two main ways to overwrite the data you no longer want to see on your disk.
The first is the use of the context menu in Windows (with a right click on the file).
The second is to delete via the Eraser software interface.
Depending on your needs, you can use one or the other. that’s how
Before choosing the best method for deleting data, open the program.
Go to the Settings section. On this page, you can define the deletion method.
Several choices are available: Pseudorandom data faster, but less effective, since it makes a single pass, then there is the Gutmann method which proposes 35 passages
the best of all, but also the longest.
For best results, we recommend that you select the Gutmann method. Validate the changes by clicking on the Save Settings button.
The first method to delete a file with Eraser is by far the simplest.
Select the file you want to delete permanently. Then, right-click and select the Eraser function from the pop-up menu that appears. In the window that appears next, click the Yes button.
A more complete removal method
The other (more complete) method to delete one or more files passes through the Eraser software interface.
Click the down arrow next to the Eraser Scheduling option and select the New Task feature.
In the following window, you can (or can not) give a name to the procedure ( Activity Name ), choose when the task will be performed: manually, immediately, when the computer starts or after a ( recurring ) schedule.
In case you choose the second option, click on the Schedule tab to define a procedure schedule.
Then click on the Add data button to open a new window to select the type of data to be deleted (single file, folder, contents of the recycle bin,
unused disk space or even a partition, the deletion method and of course, the data themselves.
Click the Browse button to browse the contents of the hard drive and select the appropriate data. Then confirm by clicking OK.
The principle of removal on Windows
To understand the process that occurs when you delete a file in Windows, you need to know that you save a lot of data on your hard disk and then refer to a specific table that the system uses when it comes to opening the required documents from the hard disk. user.
When you delete a file by emptying the trash, the file system tells Windows that the location used by that document is free, but the file remains until the reserved space is overwritten by another file.
Even after doing all this, there may be magnetic traces that can be detected on the surface of the hard drive. The filesystem then removes only the reference to the original file and not the file itself, so it is possible to recover with appropriate tools.
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