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[WegeHop]

When i was looking at modding a psp i saw you could play ISO's, what are ISO's?

Thank you

[PharaohsVizier]

ISOs are dumps of disks, like DVDs, CDs, and the things PSP runs on.  It's basically roms for psp.

[Pham_John]

IT like files that you can download from the internet, or like an image of a disc

[kkan]

ISOs are dumps of disks, like DVDs, CDs, and the things PSP runs on.  It's basically roms for psp.

wiki definition of ISO

An ISO image (.iso) is an informal term for a disk image of an ISO 9660 file system. More loosely, it refers to any optical disc image, even a UDF image.

As is typical for disc images, in addition to the data files that are contained in the ISO image, it also contains all the filesystem metadata, (boot code, structures, and attributes). All of this information is contained in a single file. These properties make it an attractive alternative to physical media for the distribution of software that requires this additional information as it is simple to retrieve over the Internet.

Some of the common uses include the distribution of operating systems, such as Linux or BSD systems, and LiveCDs.

Most CD/DVD authoring utilities can deal with ISO images: Producing them either by copying the data from existing media or generating new ones from existing files, or using them to create a copy on physical media. Most operating systems (including Mac OS, Mac OS X, BSD, Linux, and Windows with Microsoft Virtual CD-ROM panel) allow these images to be mounted as if they were physical discs, making them somewhat useful as a universal archive format.

Console emulators, such as ePSXe, and many other emulators that read from CD/DVD, are able to run ISO/BIN (and other similar formats) instead of running directly from the CD drive. Better performance is achieved by running an ISO since there is no waiting for the drive to be ready and the hard drive I/O speed is many times faster than the CD/DVD drive.

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the section in blue is mainly what you are interested in  

[WegeHop]

Ok thank you to everyone who replied