Most people use the QuickPar software for this purpose:
QuickPar is a PAR 2.0 recovery volume creation tool. Use it to protect and repair any data file.
www.quickpar.org.uk
Thanks, I'll look into it. And still, if I have nested rars, i need to make PAR for only the outer rar OR all rar inside rar too?
@Wolffinch
You questions appear to be very much a homework assignment.
I also noted the same question being posted on another website.
https://linustechtips.com/topic/1423781-winrar-and-recovery-record/
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Forum rules prohibit answering homework questions.
In all fairness your questions may not be homework: however, overall there is no way on this end to know the truth of the matter.
So what you must do is to provide what you think are the answers to your questions, show your work and reasoning so to speak. Cite references. Provide links.
Post your answers accordingly and ask for comment and feedback.
What is this homework thing? Literally homework? Well I dont know if there's a school or university give "homework" like this. But I dont know.
Why I ask in many forums? To prevent answer like this. If I dont get answer from one forum, I still can get it from another.
You want me to answer my own question? It's silly but okay. i'll do it
1. I dont think non-solid archive need recogery record as solid one. Because it doesnt have single stream encryption. So If one block become bad, we still can extract the other data, because its not single solid files. But of course adding recovery record is good option.
2. I think we can only add the outer RAR only. Because if the outer rar repaired, the inside rar can be repaired automatically. But I dont know, thats why I ask.
3. Maybe 5%? Dont know, thats why I ask
Provide links? How I can do that? If I found information about this out there, I dont need to ask here. Of course I dont have it.
So, what do you think about my answer? Is that assumption true?
Well, I still confused how this technical "paranoid" question == homework assigment.