Default MicroSD Cable for unlocks

Hi,

Has anyone seen the MicroSD Cable to use with LGTool here http://gsmserver.com/shop/cables/gsm...or_lg_tool.php it's for use with various blackberrys, htc's etc. It supplys 3v to pin 4 and pin 6 to ground. Does anyone know anything about how this cable works, and why supplying power to pin 4 of the sd reader is essential to the functions carried out by the unlock software?