passkey = "MyNudel"
while true do
  if disk.isPresent("bottom") then -- Put side to the side the disk drive is on
    h = fs.open("disk/passcode", "r")
    if h.readAll() == passkey then
      print("Accepted")
      -- Insert anything here for the code, rs.setOutput() whatever..
    else
      print("Denied")
      disk.eject("bottom") -- Replace side with diskdrive side
    end
  end
end