What is the format? NTFS - FAT32 - EXT3... Are the files copied to the root or do you have a subdirectory tree in place? Some formats have limits on the total number of files you can have in the root regardless of space. Take a look at this http://stackoverflow.com/questions/466521/how-many-files-in-a-directory-is-too-manyhttps://stackoverflow.com/questions/466521/how-many-files-in-a-directory-is-too-many