Okay, well, everything you describe points to a problem with the scratch partition. All the errors you're seeing are in data blocks that exist on the scratch partition. Dunno what exactly would be causing those errors.

One school of thought would say that you have no troubles with the song files getting uploaded through emplode, and the problems are only showing after that's done. So it might indicate that the drive itself has a few bad sectors, and those sectors happen to fall in the location of the scratch partition.

Whether that's actually what's happened or not, I have no way of knowing. Perhaps others can chime in with the proper diagnostic procedures.