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You mean a guide to what file types there are and if they can be deleted off the sd card?
Anything on the SD card is considered non-essential. You can completely wipe it if you choose
Yup! For example, you put a .zip file on SDcard0 (internal flash memory), install it in recovery mode, delete the file, the software is still on the phone :thumbup: saved in ROM i think?
It depends on the app. Some will save game files on there, but nothing the the phone or app needs to run normally is on either of the cards.
If you want to test it out, back them up and wipe them. It'll be repopulated as you use it