Optimizing ISO images

[jaja2u]

Is there a down-side to 'optimizing' iso images on the PSP and then running them?

Optimizing Example

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[KR4T05]

i'm not positive on this. but i think it would just slow down the game, and make it a bit jaggy at times, more in loading times. Sorry for the bad explenation, i'm horrible at explaining things.

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[frillybob]

Please don't discuss this stuff hear.

viewtopic.php?f=8&t=15

Read the rules!

[TMMDI]

And what rule are they breaking? They are just talking about isos.

[jc_gargma]

As the padding is useless data, used to fill up the remaining UMD space, removing it should be fine.
As per making it a cso, however...

Does this require free space be on the memory card to allow for decompression, and would this decompression affect the lifetime of the memory card the cso is used from?

The decompression is done in the PSP's RAM, not the memorystick. It doesn't write to the memorystick so I'm sure it's fine. CSO's can make some games lag horribly though, like Grand Theft Auto. This is because it has decompress as you're playing before loading completely. ISO's really aren't that bad on space, at most around 2 GBs.

You can use tools like UMDGen to rip things out of ISO's (music, videos, maps, extras, ect ect) to save space too. For example, when I had a CFW PSP, I made Syphon Filter: Dark Mirror (normally 1.2 GBs) an 88 MB game by ripping out the background music, the entire story mode & all cutscenes (making it a light, online-only version).

man_of_power05 wrote:think of playing a cso like playing a psp game that has install data (dissida, kingdom hearts birth by sleep) without installing any data. that's probably close to the experience.

No, quite worse in fact. Although that depends on how much compressed is the ISO actually.

quotes from here viewtopic.php?f=17&t=271&start=60

[jaja2u]

As the padding is useless data, used to fill up the remaining UMD space, removing it should be fine.
As per making it a cso, however...

Does this require free space be on the memory card to allow for decompression, and would this decompression affect the lifetime of the memory card the cso is used from?

The decompression is done in the PSP's RAM, not the memorystick. It doesn't write to the memorystick so I'm sure it's fine. CSO's can make some games lag horribly though, like Grand Theft Auto. This is because it has decompress as you're playing before loading completely. ISO's really aren't that bad on space, at most around 2 GBs.

You can use tools like UMDGen to rip things out of ISO's (music, videos, maps, extras, ect ect) to save space too. For example, when I had a CFW PSP, I made Syphon Filter: Dark Mirror (normally 1.2 GBs) an 88 MB game by ripping out the background music, the entire story mode & all cutscenes (making it a light, online-only version).

man_of_power05 wrote:think of playing a cso like playing a psp game that has install data (dissida, kingdom hearts birth by sleep) without installing any data. that's probably close to the experience.

No, quite worse in fact. Although that depends on how much compressed is the ISO actually.

quotes from here viewtopic.php?f=17&t=271&start=60

Thanks for an actual useful answer. See, I don't want to make many games cso's (lag, and i hear it's bad) but I want to save as much space as I can for iso's!

[frillybob]

We ask you to specifically follow the following rules:
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Most of the time ISO's are pirated!

[TMMDI]

People have been talking about isos on here on more than one occasion. Linking or telling where to find pirated content is what is not allowed. If you're going to minimod at least do it right.

[widow]

We ask you to specifically follow the following rules:
- Do not post in Capital letters
- Do not send private messages with request/questions that you already posted on the forum
- Do not post illegal content. This forum does not support piracy; any mention or references to pirated content will be acted upon.
- Be polite, do not insult others.
- your signature (if any) should be less than 250 pixels in height. Moderators reserve the right to change your signature if it doesn't follow this rule.

Most of the time ISO's are pirated!

People have been talking about isos on here on more than one occasion. Linking or telling where to find pirated content is what is not allowed. If you're going to minimod at least do it right.

lol OWNED!!

[Mr. X]

It should be fine to "optimise" an ISO as long as that only means removing the padding; although I'm not sure just how much padding PSP games have.