1. Start Tails from the USB stick on which you want to delete the Persistent Storage.

  2. In the Welcome Screen, keep the Persistent Storage locked.

  3. Choose Applications ▸ Tails ▸ Persistent Storage.

  4. Click Delete in the right of the title bar.

This technique might not prevent a strong attacker from recovering files from an old Persistent Storage using advanced data recovery techniques, especially if the Persistent Storage had a weak passphrase.

See the limitations of file deletion.