The major advantage to rars is for racing. A group has certain affil sites which they pre (initially upload) their release on. Then the racers come into play and FXP the releases to other FTP sites all around the world (although a lot of it is done by auto-trade scripts rather than by hand these days). Now, if there was only one .avi file then only one person could FXP the file over to a certain site. If the site they're FXP'ing it from is only 100mbit then the file will only transfer onto the site at a maximum of 100mbit (normally less due to bandwidth usage and routing issues). This means that the file will take just over a minute to fully transfer to another site at the quickest pace. By the time it spreads to smaller topsites it will have normally been quite a while after pre. The solution to this is to split the release into a load of smaller files. These files take almost no time to transfer and numerous people can all transfer different rars to the same directory. So say that 20 racers start FXP'ing the same release to a certain topsite. They all do 2-3 rars each, and the release gets completed in >10 seconds. See how much more efficient this method is?
So no, rars have absolutely nothing to do with newsgroups or torrenting. Groups don't want their releases leaked to newsgroups or p2p.
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