Wondering how you are planning on connecting the extra LED's. The HDD LED isn't really labled correctly. It is actually the IDE bus LED, and just activates as the IDE bus is busy. Going to be difficult to add a LED to monitor a second hard drive that is on the same IDE channel (or bus for that matter), unless you make a custom circuit or custom IDE cable and monitor the pins on the custom cable for power and activate the LED when a positive signal is sent through the cable. But even then, it will not be possible to monitor 2 hard drives on the same cable, only the cable itself.