Hardware Development subforum is for people designing new hardware. Sound logic, though.
No. That's not correct. Let's say the external hard drive requires 5v and you provide it 12v. You're providing 2.2 X the rated power, which it won't be able to handle. You'll destroy the device if you provide too much power.I have an external drive that I want to add to my computer and am probably going to end up connecting the power directly to the PSU via a molex connector. I know not all external drives have the same rated "power bricks" or power adapters, but if I connect one to the PSU in this way, wouldn't it just grab as much power as it needs no matter what the power adapter gives it? I just don't want the power from it to do anything to the HD like fry it or anything. A fuse would probably protect it right?
Too little power will likely result in the device not working and probably won't damage it.