They are all removable. The flash card can only be used in SP, GBA, and NDS. The storage card can be used anywhere. For example, Sony's MS card can be used in cameras and PSP. It can be used for MP5, provided that they are all Sony's own products. PSP's UMD can only be played on PSP. The principle is the same, but things that are not used on the same platform must not be replaced casually. Think about it, computers can play games, and mobile phones can also play games. Is it Warcraft on the computer? You can copy it and put it on a mobile phone card to play. It's not the same system or platform. It's very different, so you can't just copy it and play it.