Thanks brian for your help and the picture that's helped me out a lot.
@ Pertinax
When you say you connect both of the floppy and hard drive outputs to one LED is that OK electronically? I might be thinking too practicle but if there is activity on both the floppy and the hard drive wont it push too much voltage through the resistor at once?
I might be off the mark as I'm not qualified in electronics or anything :-(
This would be a better idea for me because my case is an ATX one and only has 2 LEDs for power and hard drive activity.
Nick