Ps4 – How to download the disc games onto PS4 without needing to put discs in again

As TZHX already wrote in a comment: The PS4 is not backwards compatible, meaning you can only play Playstation 4 games on it. The only streaming capability it has is that you can stream PS4 games to a PS Vita. In the future, it will support streaming games of the PS3 and older platforms online via Playstation Now with a rental system. Only two days ago it went into open beta.

When you open the PS store on the PS4, only PS4 titles appear, so you cannot download PS1, PS2 or PS3 games at all. The only PS3 games that appear are PS Plus titles that you can claim for later download on a PS3, but cannot download on the PS4 itself.

The PS1 games available for download in the Playstation Store can only be played on PS3, Playstation Portable (PSP) and PS Vita, while the PS2 games from the store can only be played on a PS3.

Not all PS1 games are available to download on Vita, and some of them are region specific. Some also work when they're on the Vita but cannot be downloaded directly from the store.

When you access the store on console or at store.sonyentertainmentnetwork.com you can see which platforms are supported by each game.

You wouldn't be able to play any of them. PS4 doesn't support ps, ps2 or ps3 games. You can't re download them onto the console from the store for that reason. It is reasonable to assume that if Sony ever add support for, say, downloaded PS1 games then previously purchased titles will be available to you in the store.

You can't use a USB stick or similar to transfer them either as far as I'm aware, though since there's no point in doing so I haven't tried.