When starting Tails, keep the Persistent Storage locked and [[set up an administration password|doc/first_steps/welcome_screen/administration_password]].
Click on [[!img lib/network-wireless-encrypted.png alt="Unlock" class="symbolic" link="no"]]</span> to unlock the Persistent Storage. Enter the passphrase of the Persistent Storage and click **Unlock** again.
Identify the device name of your Persistent Storage. The device name appears below the list of volumes.It should look like <code>/dev/mapper/luks-xxxxxxxx</code>.
1. Choose <span class="menuchoice"> <span class="guimenu">Applications</span> ▸ <span class="guisubmenu">System Tools</span> ▸ <span class="guimenuitem">Root Terminal</span></span> and enter your administration password to open a root terminal.
To do so, you can type <span class="command">fsck -y </span> and press <span class="keycap">Shift+Ctrl+V</span> to paste the device name from the clipboard.
If the file system is free of errors, the last line from the output of <span class="command">fsck</span> starts with <span class="command">TailsData: clean</span>.
If the file system has errors, <span class="command">fsck</span> tries to fix them automatically. After it finishes, you can try executing the same command again to check if all errors are solved.