I have a keyboard with an "extra" LED that has no use. It's currently interfaced with Teensy 2.0 and works fine. 3 of the four LEDs are Caps, Num, and Scroll Lock but the 4th had no use ATM. I've also rearranged my desk so I can no longer see the HDD light on my PC case - I know I could direct wire…

Monitoring HDD activity, can it be done?

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