I feel for you — I did the same thing a year ago.
From my experience is that it is possible sometimes to recover it – though a pain in the neck.
If you did a secure empty trash they are unrecoverable … if just a normal empty many are recoverable.
With Media 100 files though, I think you are out of luck as even if you did manage to recover them
the files names would change and they would never relink to your program.
From what I learned and went through, you can recover a good deal from a Hard Drive even on OSX.
However, the files will never be recoverable with the same names or in the same file structure. So say,
you erased a word file called newletter.doc. You could recover the file but it would end up being called
somethign like WordFile0004576896.doc.
I would recommend a program called Data Rescue (I believe they are on the second version). It recovered
a horde of files – though as I said their names were no longer the same.
Best of Luck,
Jack