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 RAR 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 not be larger than the tenfold amount of RAR volumes. Values exceeding the threshold are adjusted automatically.
You may also append a percent or 'p' 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
If <N> parameter is omitted, it is set to 10%.
You may read more about recovery volumes here.