A quick poke at the retroid pocket's product page says it's underlying OS is Android 14. Android defaults external storage formatting to fat32 or exFAT, both of which Raspbian or most Linux distros can support (with an extra package in exFAT's case). You should have no problems with each device reading the cards, but I'm not sure what emulators each uses.
this post was submitted on 26 Apr 2025
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Oh no, that’s my bad. I meant to write that as RP4P Retroid Pocket 4 Pro, not a Raspberry Pi 4, but interesting to know all the same!
I do just this between my rg353m and x55 with Rocknix as the os on a separate SD card for each device and a separate larger SD card for games that I switch back and forth.
That’s promising. I’ll have to double check and see how I have mine configured.
Just to be clear, I have three SD cards. Two just have the rocknix os on them and are in slot 1 of the two devices. The third has all the roms and ports in it, and it gets swapped into the device I'm using second slot.
I use the x55 at home, and the rg353m when I'm out of the house.
I'm not half the nerd as some of these guys, but I don't see why not as long as there's plenty of space.
I have an RP2+ so I don't know if it's exactly the same, but with most Android devices, if you've configured the SD as an extension of internal memory, then no, it won't work (and might screw some things up on the old device if you remove it). But if you're just using it as external storage, I don't think there should be any problem.