lock

local diskSide = "bottom"
local rsSide = "right"

while true do
  term.clear()
  term.setCursorPos(1,1)
  print("Please insert disk to enter...")
  while true do
  if disk.isPresent(diskSide) then
    if disk.getID(diskSide) == 4 then
    term.clear()
    term.setCursorPos(1,1)
    print("Access granted!")
    disk.eject(diskSide)
    rs.setOutput(rsSide, true)
    sleep(5)
    rs.setOutput(rsSide, false)
    else
    term.clear()
    term.setCursorPos(1,1)
    print("Access denied!")
    disk.eject(diskSide)
    end
  end
  end
end