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The R4 cart size is identical to an original cartridge and the MicroSD card fits securely into the R4 with no parts sticking out. The R4’s MicroSD slot is spring loaded and also has a small circular groove on the corner to allow for easy removal of the MicroSD card. Eventually you’ll never remove the R4 from your DS, but instead just remove the MicroSD card when uploading new ROMs or homebrew.