this line 155
if (preg_match('/([0-9\.]+)\s*([a-z]*)/i', $str, $regs)) {
$bytes = floatval($regs[1]);
switch (strtolower($regs[2])) {
case 'g':
case 'gb':
$bytes *= 1073741824;
break;
case 'm':
case 'mb':
$bytes *= 1048576;
break;
case 'k':
case 'kb':
$bytes *= 1024;
break;
}
}