/O options: More than one may be specified by using the switch repeatedly. Only one of the following can be used. ERRUNAVAIL: ...

/O options:  More than one may be specified by using the               switch repeatedly. Only one of the following can be used. ERRUNAVAIL:  The mount request will generate an error if either the               media or the drive is not available. READ:        Mount for read access.  WRITE:       Mount for write access. If this option is selected               completed media will not be mounted.  DRIVE:       To be specified if drive guid or name is provided.  OFFLINE:     Error is returned if media is not on-line. If this option               is not used then operator request is queued.   /T Timeout:  Specifies a timeout in milliseconds. Default is INFINITE  /R Priority: Default priority is NORMAL.