Garrett sent us a rather informative email about playing PS1 games on your PSP. He seems to have found a way to make the games run without all the extra padding originally placed on the disc. If you're wondering what that means, it's this: Imagine playing a 500MB game using only 50 MB of space.
You'll need something called CDGenPS2, which we've placed for download below. If you follow the steps, you should be able to get a game to play on a drastically smaller file size. We're currently testing it, but you're free to try out the procedure too. Garrett says he'll make a more in-depth tutorial on it if people have problem though, which is really nice of him. For now, you'll do well to read through his email below (with some slight changes for grammar and clarity).
PS1 and PS2 games use a very strict architecture for how the binary files of the games are organized on a discs. When a disc copying program copies these discs, it's known that they will leave the padding of empty bits (0xFF) for the remainder of the XXXMB media.
For example, Tetris Plus for PS1 has a total file size on the disc of 43.0 MB and the image from CloneCD is 566MB. However, if you try to remove the padding from a disc, it will no longer work with emulators, including POPS. A utility for those who load games from their PS2 hard drives to lessen the size of the images, known as CDGENPS2 (Much like UMD-GEN), has the ability to remove this padding and keep the structure of the disc intact. Using this utility with some software that can extract an ISO to its contents can bring the 566MB Tetris Plus image down to about 50MB (POPS compresses it to about 400MB).
How to do it:
1. Extract the ISO contents to a folder on your hard drive.
2. Open that folder and select ALL of the extracted contents from the root of the disc.
3. Open CDGENPS2.
4. Drag the contents of the folder into the CDGENPS2 window (the giant white space that says ISO near the top)
5. (Optional) Go to file-> Edit Volume and change the name of the volume so that it matches the original title of the game (for archival reasons only).
6. Click the IMG button on the left-hand side of the screen and save the Bin/ISO/IMG to whatever directory you want , and use POPS to convert to PSP EBOOT and test it.
If it doesn't work and I get enough emails about it not working I will write a more in-depth tutorial about it with screenshots and everything on the forums.
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