/CACHE
       /NOCACHE (default)

    This qualifier causes EFI$CP to cache critical volume data data
    in memory, rather than writing the data and the changes out to
    the partition or the disk volume after each EFI$CP command.

    Selecting /CACHE provides better performance (and particularly
    with slow devices, such as floppy disk volumes), though there is
    an increased risk of exposure to inconsistent or incomplete data
    should an application or a system problem arise before the caches
    are flushed; should the application exit unexpectedly prior to a
    DISMOUNT operation.

    If you choose MOUNT/CACHE, you will want to specify the DISMOUNT
    command to dismount the device or the partition; to effect the
    necessary cache flush. Failure to cleanly flush the volume cache
    can result in volume corruptions and/or data loss.