--silent_mode={on|off}
If the parameter value is on or if the parameter is not specified, the silent mode is enabled. It means that the software will automatically handle situations requiring user interaction. If an operation cannot continue without user interaction, it will fail. Details of the operation, including errors, if any, can be found in the operation log.
If the value is off, the command allows interaction with the user. Set this value if the operation requires a user interaction, such as inserting removable media (CD, DVD or tape).
To prohibit interaction when the software comes across a bad sector during backup, use the --ignore_bad_sectors parameter. The --silent_mode parameter does not work in this particular case.