What is the default chunk size and block size to read or write data from disk libraries?

By default, the system uses 4 GB as the chunk size and 64 KB as the block size to read/write data from disk libraries. If necessary, you can change these values in the Data Path Properties dialog box for each data path. Access the Data Path Properties dialog box from the Data Paths tab of the Copy Properties dialog box for the selected data path. For more information about using chunk and block sizes, see Performance Tuning.