For the SD2 slot, I recommend a 64GB or 128GB card, which will allow you to load EVERY 8-bit and 16-bit game out there, all of the arcade games that work, and a large number of PS1, Sega CD, and TurboGrafx-CD games (those systems have the largest file sizes). In general, I would expect to pay about $7 for a 16GB card, $12 for a 64GB card, and $17 for a 128GB card.

The prices fluctuate all the time, so keep an eye out for deals. In general, I recommend the cards listed below, in order of preference. I recommend you store that original card somewhere safe in case you run into any issues in the future, and buy new SD cards from a reputable brand like SanDisk or Samsung to use in your device. Your safest bet is to replace your cards with microSD cards from a well-known brand, which will prevent the cards from getting corrupted over time. In this guide I will show you how to set up each method. You can either use a single-card setup to host both your system files and the games on one card, or you can separate the two functions using a dual SD card setup. The “TF2/EXT” slot is for your game files, so you will want a larger card for that one. The “TF1/INT” slot on your device holds the system firmware, so for that card 16GB is ideal.

The RG35XX will come bundled with a single microSD card, and in some cases two SD cards, but they are from a generic brand and will be prone to failure. Sandisk (left) and Samsung (right) microSD cards

Sd card formatter mac fat32