Among the changes mentioned in yesterday’s Nintendo Switch 2 presentation was a note that the new console doesn’t just support MicroSD Express cards for augmenting the device’s 256GB of internal storage, but it requires MicroSD Express. Whatever plentiful, cheap microSD card you’re using in your current Switch, including Sandisk’s Nintendo-branded ones, can’t migrate over to your Switch 2 alongside all your Switch 1 games.
MicroSD Express, explained
Why is regular-old MicroSD no longer good enough? It all comes down to speed.
Most run-of-the-mill SD and microSD cards you can buy today are using some version of the Ultra High Speed (UHS) standard. Designed to augment the default speed (12.5MB/s) and high speed (25MB/s) from the earliest versions of the SD card standard, the three UHS versions enable data transfers of up to 624MB/s.
But most commodity microSD cards, including pricier models like Samsung’s Pro Ultimate series, use UHS-I, which has a maximum data transfer speed of 104MB/s. The original Switch uses a UHS-I microSD card slot for storage expansion.
Why have newer and faster versions of the standard—UHS-II, UHS-III, and SD Express—failed to achieve critical mass? Because for most consumer applications, it turns out that 100-ish megabytes per second is plenty. The SD Association itself says that 90MB per second is good enough to record an 8K video stream at up to 120 frames per second. Recording pictures and video is the most demanding thing most SD cards are called upon to do—give or take a Raspberry Pi-based computer—and you don’t need to overspend to get extra speed you’re not going to use.
All of that said, there is a small but measurable increase in launch and loading times when loading games from the original Switch’s microSD card instead of from internal storage. And for games with chronic performance issues like Pokémon Scarlet and Violet, one of the community-suggested fixes was to move the game from your microSD card to your Switch’s internal storage to alleviate one of the system’s plentiful performance bottlenecks.