[TriLUG] Hardware Question: 2.5" IDE Drive Connection

[Chris Knowles]

OK, I think that the Aaron we know and love was killed and replaced by a
Google based AI.

I mean, when was the last time you saw him in person?  

Using their cache of his (presumed) gmail account as well as his posts
here, the AI is able to accurately imitate his style and general
interests.

The only problem is that it's getting too ambitious.

CJK

On Tue, 2007-02-20 at 10:10 -0500, William Sutton wrote:
> Just out of curiosity...is there anything you *don't* know?
> 
> -- 
> William Sutton
> 
> 
> On Tue, 20 Feb 2007, Aaron S. Joyner wrote:
> 
> > Scott Chilcote wrote:
> > > Hi Folks,
> > > 
> > > I have a piece of equipment that has an internal 2.5" IDE drive
> > > (notebook size).  It would be very useful to have an LED that shows
> > > drive activity, and there is a place on the cabinet for one.
> > > 
> > > Has anyone seen a wiring diagram or a cable sold anywhere that would let
> > > me attach an activity LED to a drive this size?
> > > 
> > > Thanks,
> > > 
> > > Scott C.
> > 
> > So I don't know what your application is, if it's a PC or what.  You say
> > "notebook size", which leads me to believe it's not a notebook...
> > 
> > Typically there is a pair of pins on the motherboard that provide
> > something that might be called an "IDE Activity" light, which you can
> > hook up a standard 0.100" centered jumper pin to, with an LED on it.
> > These could be scavenged from most any old PC case, or also assembled
> > from parts via Mouser or Digikey.  It'd be better to just ask around
> > before the next meeting, surely someone on this list can cannibalize an
> > old case and give you an appropriate LED and cable.
> > 
> > If on the other hand, you don't have a motherboard involved, and want an
> > answer to your actual question...
> > 
> > General consensus from some Googling around seems to indicate that on a
> > standard 40-pin IDE connection, it's pin 39.  The extra 4 pins on a 2.5"
> > hard drive are for power and I think a master/slave setting, so they
> > shouldn't matter for purposes of this discussion.  If you're comfortable
> > with a soldering iron inside the case in question, tapping into the pin
> > shouldn't be too hard.  This diagram will probably get you started:
> > 
> > http://www.pjrc.com/tech/8051/ide/ide-sch.gif
> > 
> > It's part of this article about using an IDE hard drive with an 8051 chip;
> > http://www.pjrc.com/tech/8051/ide/
> > 
> > Note the 470 Ohm resistor in series with the LED.  Note: according to
> > the diagram the pin sinks current, as opposed to sourcing it, as I would
> > have sort of expected.
> > 
> > Best of luck, let us know how it turns out!
> > Aaron S. Joyner
> > 
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