Switch -RR[N] - add data recovery record
This switch is used when creating or modifying RAR archive to add the data recovery record to archive. For RAR 4.x format 'N' parameter can be either the number of recovery sectors (n=1à 524288) or percent of archive size if '%' or 'p' modifers are specified after 'N'. For RAR 5.0 archives 'N' is always the percent of archive size regardless of persence of modifiers.
Syntax of this switch is similar to "RR[N]" command. Please read RR[N] command description and recovery record topic for more details.
Shell mode equivalent of this switch is the "Add recovery record" option in the Archive name and parameters dialog.
add all *.txt files from the current folder to the archive Books and set the recovery record size to 3% of the total archive size
WinRAR a -rr3p Books *.txt