I’ve received many questions over the years about SD-based devices and their supposed “32GB limit”. I’ve included instructions as part of many guides on this site, but I felt it’s time to dedicate a separate page to this issue and it’s easy solution: https://www.retrorgb.com/sdformat.html
Normally I wouldn’t post a site update as “news”, but SD formatting seems to be getting much more relevant as more ODE’s are being released that can easily take advantage of larger SD cards. As a result, this page will be linked under the “ROM Cart” section, as (other than the MiSTer) that section is where it would be most relevant.