As a matter of course, with ever ISO I open it up in UMDGen 4.00 and 'Optimize' it. I then save it as a CSO with compression level 9.
I'd say about 95% of all ISO's then work perfectly on the PSP. However there are a number that I've come across which either crash the PSP or just don't load.
Tony Hawks Project 8
WWE Smackdown vs Raw 2007
Mega Man Maverick Hunter X
Mortal Kombat Unchained
Test Drive Unlimited
Would the 'Optimize' process be stripping out files needed for the CSO to run? Or is it just that the above games just don't work regardless?
In laymans terms, what does the 'Optimize' feature actually do?
As I say, I run this as a matter of course, as it can reduce an ISO from anything from 20mb to 200mb+ sometimes. But I'm just curious as to whether this process is the cause of some CSO's not working on the PSP?