dir /b /s C:..\
Dlaczego to pokazuje tylko zawartość dysku C? Wg tego
Relative paths can combine both example types, for example "C:..\tmp.txt". This is useful because, although the system keeps track of the current drive along with the current directory of that drive, it also keeps track of the current directories in each of the different drive letters (if your system has more than one), regardless of which drive designator is set as the current drive.
*źródło:http:*msdn.microsoft.com/en-us/library/windows/desktop/aa365247%28v=vs.85%29.aspx//
tak powinno chyba być , albo to ja nie umiem czytać ze zrozumieniem.