Disk_File[=(options)]

    Specifies that you want to perform a multithreaded backup
    operation to disk files, floppy disks, or other disks external
    to the PC. You can use the following keywords with the Disk_File
    qualifier:

    o  Writer_Threads

       Specifies the number of threads that Oracle RMU should use
       when performing a multithreaded backup operation to disk
       files. You can specify no more than one writer thread per
       device specified on the command line (or in the command
       parameter options file). By default, one writer thread is
       used.

       This qualifier and all qualifiers that control tape operations
       (Accept_Label, Density, Label, Loader_Synchronization, Master,
       Media_Loader, Rewind, and Tape_Expiration) are mutually
       exclusive.