my @a = (
  [4129290, 1675967, 2412031, '41%', '/usr/bin' ],
  [4129290, 1675967, 2412031, '41%', '/usr'     ],
  [4129290, 1675967, 2412031, '41%', '/local'   ],
);
sorter(@a);

__END__
output
======
before sort: /local
Sorted by drive: /usr/bin