<SCRIPT LANGUAGE="JavaScript">
<!--
function showDriveList() {
  var fso = new ActiveXObject("Scripting.FileSystemObject");
  alert(fso.drives.count);
  var coll = new Enumerator(fso.Drives);
  for (; !coll.atEnd(); coll.moveNext()) {
    alert(coll.item().DriveLetter);
  }
}
-->
</SCRIPT>

, as it is apparently reserved but not documented.

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