mods while working with 500GB SSD

    @param dev_path: path to device

    Return: disk size in GB

    """

    #TODO: test error 

    try:

        parted_print = subprocess.check_output(['parted', '-m', dev_path, 'unit', 'GB', 'print'])

        fields = parted_print.split(':')

        sz = fields[1]

        disk_size = int(sz[:-2])

    except:

        print ("FIXME: (with fresh disk only) add ''mklabel', 'msdos'' in case of 'Error: /dev/sda: unrecognised disk label'")

        disk_size = 0

    return disk_size

    "with their totals sizes and possible system partition sizes separated by colon")

    parser.add_argument('-e', '--errno', nargs = 1, type = int, help = "convert error number returned by the script to error message")

    parser.add_argument('-d', '--dry_run', action = 'store_true', help = "execute the script but do not actually create partitions")

    parser.add_argument('-f', '--force', action = 'store_true', help = "force 'mkfs' to create a file system")

    parser.add_argument('-f', '--force', action = 'store_true', help = "force 'mkfs' to create a file system and re-format existing partitions")

    parser.add_argument('-p', '--partitions', action = 'store_true', help = "list partitions and their sizes separated by colon")

    args = parser.parse_args()

    if args.list:

        disks = find_disks()

        disks = find_disks(args.force)

        for disk in disks:

            total_size = get_disk_size(disk)

            if total_size > 0: