dd_in_flags 

Defines the dd options required for reading from tape.

This parameter is required if you are working with raw devices. To access raw devices, the dd command is used. See Raw Devices with BRBACKUP and BRRESTORE.

Syntax: dd_in_flags = <flags>

Default value: "ibs=16k"

If you define the default value, the data is read from tape in blocks of 16 KB, but you can also use a higher value, for example 64 KB.