Simple HDD LED Questions

[Ecto]

I apologize in advance for the basic questions. If there is a better place to post things like this please inform me.

Over Current Protection:

I am trying to add some drive activity lights. I am worried about over-current protecting my stuff. I trashed a MB once by shorting out a lead.

V = IR

I = V/R

So for an LED at 5 vdc using a 470 ohm resistor that comes to 11 mA. If I use a miniFuse in the 50-100 mA range is that going to provide some over-current protection on my leads?

Obviously, I would not use the resistor in a circuit pulling from a TTL souce but I am using it as a guide. Is there a better way to come up with a current rating for a TTL circuit driving an LED?

Drive Activity LEDs:

Is there a way to "tap" into an IDE or SCSI cable to fish out a drive activity signal? After checking the doc.s on all my drives I find that none of them provide an activity output. All the activity signals I know about come from the MB. Unfortunetly, there appears to be no way to get the MB IDE activity signal to tell me which drive is active.

The board is an Intel D850MVL.

Any help appreciated.

Ecto

[Brad]

I doubt putting in a fuse would be worth it, just run the led with the resistor.

as for the ide cable, there is one that measures activity, I think it may be pin39, but I really can't remember. pH or butcher may know.