Securely delete data windows

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As useful as this is for legitimate users who may have deleted data by accident, bad actors, such as hackers, can use freely downloadable digital forensic tools to recover your files in seconds. Eraser is a tool that seeks to restore the balance. This free utility works by repeatedly overwriting every bit of data in files or folders you select to delete it securely.

Eraser is highly customizable: You can choose your own erasure method, such as seven passes of pseudo-random data, and can even automate tasks, such as overwriting free space on your hard drive.

Open your web browser of choice and navigate to here. Your browser is now redirected to Source Forge, which hosts the installation files. Windows 10 displays a security alert at this stage. The setup wizard first tries to install the. NET Framework 4 on your machine. If this is already installed on your version of Windows, you may see a system prompt. The wizard now asks you to choose an installation type.

If you chose to install shell extensions, you can access Eraser with just a few clicks of your mouse. In general, when you delete a file or directory in Microsoft Windows 10 it is moved to a special location known as the Recycle Bin.

If you want, you can retrieve a file from the Recycle Bin and restore it to its previous status. To permanently delete a file in Windows 10, you have to empty the Recycle Bin—this is common knowledge for most users. However, because of how file storage works in Windows 10, with some simple tools, a person with malicious intent could still retrieve a deleted file, which could be a serious problem if that file contains sensitive data.

To securely and completely delete a file, you have to overwrite the specific memory sectors on your storage device with new data. Third-party tools are available for this process, or you could opt for a free Microsoft-provided tool.

This how-to tutorial explains how to download, install, and use Microsoft's SDelete utility, which allows users to securely and completely delete files in Windows SDelete is a Sysinternals command-line utility you can download for free from Microsoft. Locating the. By default, SDelete will overwrite a deleted file only one time; however, best practice and organizational policies may dictate a more stringent protocol. The US Department of Defense , for instance, has two different standards that require three passes and seven passes, respectively.

For most situations, three passes should be more than enough, but you should always follow established organizational policy. To use the SDelete utility, open an administrative-level command prompt Figure B by right-clicking the Start button.

SDelete accepts wild card characters as part of the directory or file specifier. Securely deleting a file that has no special attributes is relatively straight-forward: the secure delete program simply overwrites the file with the secure delete pattern. Compressed, encrypted and sparse are managed by NTFS in cluster blocks.

If a program writes to an existing portion of such a file NTFS allocates new space on the disk to store the new data and after the new data has been written, deallocates the clusters previously occupied by the file.

NTFS takes this conservative approach for reasons related to data integrity, and in the case of compressed and sparse files, in case a new allocation is larger than what exists the new compressed data is bigger than the old compressed data.

Thus, overwriting such a file will not succeed in deleting the file's contents from the disk. Using the defragmentation API, SDelete can determine precisely which clusters on a disk are occupied by data belonging to compressed, sparse and encrypted files. Once SDelete knows which clusters contain the file's data, it can open the disk for raw access and overwrite those clusters.

Cleaning free space presents another challenge. The first is that it can, like it does for compressed, sparse and encrypted files, open the disk for raw access and overwrite the free space. This approach suffers from a big problem: even if SDelete were coded to be fully capable of calculating the free space portions of NTFS and FAT drives something that's not trivial , it would run the risk of collision with active file operations taking place on the system.

For example, say SDelete determines that a cluster is free, and just at that moment the file system driver FAT, NTFS decides to allocate the cluster for a file that another application is modifying.

The file system driver writes the new data to the cluster, and then SDelete comes along and overwrites the freshly written data: the file's new data is gone.

The problem is even worse if the cluster is allocated for file system metadata since SDelete will corrupt the file system's on-disk structures. The second approach, and the one SDelete takes, is to indirectly overwrite free space. First, SDelete allocates the largest file it can.