I wanted to use this cable to share an external drive between a PC and a decoder / recorder TNT. At first, I placed between the disc and the decoder to keep the disc near the PC, it does not work! The HDD lights and turns off the decoder will not "see". Hence the following wiring, SD near the decoder, a cable to a switch, the switch to the PC via cable. With the switch, SD at will becomes a PC or decoder device.