Attached Link: http://www.midwayisd.org/PDFs/help/200ways.pdf

When you put it in the second PC as a slave, did you change the jumpers on the back (if any) for it to function as a slave drive?

If you've ruled out the basics and aren't willing/able to pay the steep cost of data recovery shop, you might try this link to various things to try.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken