Today I spent some time setting up my Sony PSP to play UMD isos and mp3s on a second 32GiB SD card.
I have PSOne and PSP games on another 32GiB card, and am waiting for a new 64GiB card to come sometime this week to combine them.
I'm planning on using the PSP as an offline media player and not have the distraction of a full blown smart phone.