: If you are missing even one part of the sequence, the extraction will fail. Make sure you have downloaded the entire set.
: If you get a "Checksum Error," one of the volumes (potentially the .r21 file itself) may have been corrupted during the download and needs to be re-downloaded. R21 File Extension - What is .r21 and how to open? Download r21 rar
: On its own, an .r21 file usually cannot be viewed or played. It is a fragment of data meant to be reconstructed with all the other parts (from .rar or .r00 up to the final number). Why are Files Split This Way? : If you are missing even one part
