P1nnacle :
If you used a program to wipe the drive, the data's gone. When a program wipes a drive it replaces all of the data with a set of numbers, all 0's or all 1's, something to that degree. The data that was previously there is not completely gone, with no chance for recovery.
If the data files disappeared quickly, they are probably still there. A standard file erase or even reformat just wipes the file directory. If the drive had to work for a long time, then complete data loss is a possibility.
I would look into a commercial data recovery program. I've used one before (on Windows) and it worked pretty well. It took many hours however. All day, IIRC.