I don't know if anyone heard of the company, Vosonic, but i have one of their hard drive units, it has a 60 GB hard drive, screen, like one of those portable media centers. Anyway, i use this to back up all of my pictures that i take, so it's purely media. After i backed up some pictures from my MacbookPro after converting the RAW files in PS CS3, i noticed there were these files that were numbered the same as my image files except had a '_' before 'IMG' and my Vosonic said it had an error decoding the file. So i scrolled down and found the real files, but i still dont understand why Mac put these files on. My PC never did this. Does anyone know wha i'm talking about?