Are you planning to these files to a specific platform, or are you creating them for local long-term storage ?
To create a parity (PAR2) file—commonly referred to as "paper" or "repair blocks"—for the multi-volume archive , you can use specialized software designed to verify and repair split RAR archives. These files act as "insurance" for your data by allowing you to reconstruct missing or damaged parts of the archive. Tools for Creating PAR2 Files sc19688-RDRI2IBLD143628EG.part22.rar
You can use the following tools to generate recovery data for your RAR volumes: Are you planning to these files to a