If you want to securely erasoverwrite all data on the device, choose to <span class="guilabel">**Overwrite existing data with zeroes</span>** in the **Erase** drop-down listmenu.
Click on the [[!img lib/system-run.png alt="Additional partition options" class="symbolic" link="no"]] button and choose **Change Passphrase** in the shortcut menu.
Click on the [[!img lib/system-run.png alt="Additional partition options" class="symbolic" link="no"]] button and choose **Change Passphrase** in the shortcut menu.