Compressing techniques that actually work?

So, I'm attempting to compress a series of files into a single archive, be it rar, zip, 7z, whatever, and the resulting compressed file I get every time is either a single archive  LARGER than the combined size of the uncompressed files or a single archive 1 meg smaller than the combined size.

I'm pretty frustrated with this shit, as I've seen files that totalled 3 Gigs in size compressed down to a 600 meg rar, and I want to know how to do that. SO far every compression prog I've used has produced the same shit results.

Help, anyone?

>>1
use 7zip maximum compresion ratio (you better have 2 gigs of ram for that)

>>2
he's right, although i don't exactly understand how compression works

but last time i saw 7z compress file from around 14gb to 300mb, thats insane

>>2

why 2gigs ram ? i think my friend only got 512 or more proably, but it took him whole day though

>>4
to not take the whole day =ñ_n=

>>1
You're probably trying to compress jpegs, mp3s, avis, or some other shit that's already in a compressed format.  You cannot shrink such things any more.  If you're lucky, you might save 1%.

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