Shrinking ISO's

I posted this in the Tutorials section too... but with only 1 response, I thought I'd post here instead.

So I downloaded an ISO of Madden 08 a couple weeks ago... so playing the game for free was rockin', but it's 878mb size was quite frustrating, seeing as how I only have a 1Gb memory pro duo. Free game... but now I'd have to go buy new MemCards.

Last night I found (on the same site) somebody who had a fully functioning copy of the game that was 161mb.

How do you do that???

TBag said that typically you have to delete music & video to reduce the size. I've now noticed that this version of Madden is without commentary, so how do you actually delete stuff like that? Are the files pretty much cut & dry?

I assume you'd have to use something like UMDgen... but I don't know that I feel comfortable enough deciphering what files to keep and cut.

Help!

Basically you have to dummy the videos, you cant just delete them cause the game wont work. You take the smallest video and use it in place of the rest of them. Most people rip out the non-english portions of the game as well.