Dariolius is perfect for these situations. You can choose to split files according to different criteria. You have full control of how you wish to split your files. The program doesn't require you to "show it the disc" to prove you need to split the file like many other programs do. Dariolius can be set up and run unattended, and you can choose to recombine the files using either a DOS batch file or a merger program, depending on your needs.