it depends what is is.
Movies = virtually no compression.
Music = Virtually no compression
Some games = Virtually no compression
Lots of games = a hell of a lot of compression.
Roms = great compression when you have a lot of them with 7-zip
Wii Scrubbed games = a lot because all the duff data has been removed, you may see Wii Scrubbed games at 500meg, unrar them and they will be 4.62gig ISO.
I remember years ago i done Breakout on the PS1, 700meg CD image, rared it and it went down to 8meg lol
So it all depends what it is, The scene do it for FTP Transfers, and also Usenet does not really accept big files, they do but its frowned upon, so you have to rar split them and add pars for usenet.
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