There arent any files with the specs you say (larger than 4GB, symbols, or too long) sutch files though would have issues on Leoppard too though... no?Sounds like the drive is formatted as FAT32. Ensure that you're not trying to copy any files that are incompatible with the FAT32 format (files larger than 4GB, files with symbols in their names, files that have names that are too long, etc.).