Problem backing up jpgs with Nero 6

I am using nero 6 to back up jpg’s to memorex cd-r. They are organized into folders on my harddrive. I am using a samsung sw-4088 8x burner at 4x speed. I am backing up the same way i do for data and video files. I never had a problem before. When I check the jpg images they are mostly ok but some are corrupted showing only half images, some have weird green and grey bars. Any suggestions? Thanks

Zip 'em!