# File test/backup/tc_dos_disks.rb, line 20
        def test_bad_dsks
                assert_raise(RuntimeError,"short file should throw an error") {dsk=DSK.new("0"*100)}
                assert_raise(Errno::ENOENT,"non existant file should throw an error") {dsk=DSK.read("NonExistantFileName.not")}
        end