They are UMD disks.
Games on disk are UMD format, PSN games are .pkg format.
ISO is the format in which the games of the PSP is saved as.Most of the PSP games are in ISO or CSO.So if you search for PSP ISO in a search engines, those that came up are probably PSP games for downloads.
No games must be redeveloped to become a different game version. It is not just a format change
The PlayStation store sells only games that are compatible with Sony PlayStation Products and include the PS2, PS3, PSP and PSP Go
mp4 or PSP Video format
Are You Talking About The Games Or Other Things. If Games You Have To Make A Folder On The Root Of Psp Named "ISO". It Should Be In Capital Letters.
maybe it as not been modified properly or ur umd is not working if your talking games on memory sticks save them and format the psp
The PSP 2, or NGP, will not have a UMD drive, so any games you have in UMD format will not be playable on the PSP 2. However, any games that you have downloaded on your PSP 3000 can be transferred to the new PSP.
psp is used by photoshop.
You need to format the memory card, and copy the game back.
PSP roms are in ISO format. They are in the ISO 9660 standard. However, it can be compressed to CSO, DAX, or JSO, proprietary formats developed for the PSP
psp mostly uses the mpeg4 format