Command RV[N] - create recovery volumes
Create recovery volumes (.rev files), which can be later used to reconstruct missing files in a volume set.
This command makes sense only for multivolume archives and you need to specify the name of the first volume in the set as the archive name. For example:
WinRAR rv3 data.part01.rar
The optional <N> parameter specifies a number of recovery volumes to create and must be less than the total number of RAR volumes in the set. You may also append a percent character to this parameter, in such case the number of creating .rev files will be equal to this percent taken from the total number of RAR volumes. For example:
WinRAR rv15% data.part01.rar
You may read more about recovery volumes here.