Have you run into this when copying over a large file from your hard drive to a flash drive?
The answer is most likely simple, you need to have your flash drive formated as NTFS.
Due to limitations of the FAT file system, you are unable to copy over anything larger than 4GB.
Be careful when you reformat the flash drive. Flash drives can be touchy and may require special software to format them correctly otherwise it may render your flash drive inoperable.
