fzabkar - problem is, WinRAR will split it after it is created, and it can't be created. Does the utility allow you to "pipe" the output of another process (the backup) through it and split the file before it is actually written to disk? That's something that I do in Unix os'es (what is the correct plural of OS, anyway?), but not in Windows.
Original poster: Still waiting to hear if the drive has data that you need or not; the answer will depend on that.