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Worked in my Dell Precision M8400 after a quick switch...
on June 3, 2014
So, I bought this to replace the DVD drive in my Dell Precision M8400. It worked, but not before I had to make a quick switch.
When I first installed it, the computer ran WAY slow. Something just wasn't right., so I started wondering if I wasn't suffering from a similar issue as Steve325 described. I was about to take the thing apart and attempt the "3rd pin mod" as he described when I noticed a small little dip switch on the left rear side of the caddy. So, I flipped the switch and re-installed the drive, and boom! Everything sped back up and worked perfectly.
Note that there is absolutely no mention of the switch anywhere on the packaging. It's my suspicion that the switch either connects or disconnects that 3rd pin and I'm wondering if Steve 325's caddy had the switch or not.
So, lesson learned. If you install this caddy in your machine and it isn't working right, look around for a small dip switch. I don't know if all of these caddys are like mine or not, but if the switch is there, try flipping it and re-installing the drive. Mine worked a treat after I did.
Footnote: If I can figure out how, I'll upload pictures of the switch on my caddy as I took a few before I re-installed it.