i just added to jdownloader the link to that file, it reports that the file is indeed 657.15 mbs in size
what size does it report on your hard disk that same file?
if you already verified the md5 values the file should be ok, complete but be sure that the size is the same it should be
have you tried to use another burner app? k3b is not my favorite app, i had better results with brasero