See also [[!wikipedia Data_erasure desc="Wikipedia: Data Erasure"]].
8
**Operating systems do not actually remove the contents of a file when ithe file is deleted**, even after emptying the trash or explicitlyremoving the file, from the command linefor example. .
Operating systems do not actually remove the content of a file when the file is deleted, even after emptying the trash or removing the file from the command line.
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Securely delete files<h2 id="tails">Use Tails to avoid saving files</h2>
Check that the brand and size of the device in the right pane corresponds to your device.
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Click on the [[!img lib/open-menuview-more.png alt="MenuDrive Options" class="symbolic" link="no"]] button in the right corner of thetitle bar and choose **Show Hidden FilesFormat Disk**.
Click on the [[!img lib/view-more.png alt="Drive Options" class="symbolic" link="no"]] button in the title bar and choose **Format Disk**.
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Choose to <span class="guilabel">**Overwrite existing data with zeroes</span> in the <span class="guilabel">Erase</span> drop-down list (Slow)** in the **Erase** menu.
Choose **Overwrite existing data with zeroes (Slow)** in the **Erase** menu.
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Choose <span class="guilabel">**Compatible with all systems and devices (MBR/DOS)</span>** in the <span class="guilabel">Partitioning</span> drop-down list**Partitioning** menu.