Pokémon Sword and Shield appeared today. It should be a joyous opportunity, except that some players have hit quite a hook: they say that the downloadable versions of the games erase all their Switch Save data. In fact, that is not quite the case, but the breakdown in question is certainly alarming.
It started last night when a handful of players on Twitter reported that Sword and Shield crashed and deleted the data on their SD cards. Others then falsely said on Reddit that the games deleted all people's files stored as clean as an unaltered Ditto. Fortunately, the switch only stores backup files in system memory, which means that the hundreds of hours that you've spent Breath of the Wild for the most part, on collecting horses instead of chasing divine beasts, are safe.
However, a glitch seems to be, according to console hacker SciresM distorts data on SD cards. A data retrieval timeout on Twitter has been identified that ultimately causes some type of SD card format (exFAT) to be wired and data corrupted (often defaults to default). You recommend using a different format for your SD card to avoid interference. "Do not use the exFAT driver and you should not miss / you should not lose any data, even if your console crashes," SciresM wrote exFAT formatting by default, which could mean you are vulnerable to this glitch – even if so relatively rare is the case. On the other hand, the worst-case scenario is not so bad. You will not lose anything permanently except maybe some screenshots. You can easily re-download all your games, and your saved files are safe again, no matter what.
Kotaku turned to Nintendo for information on when an update would come, but the company did not respond to this release. Hopefully it will have something ready sooner than later, because even if it is not apocalyptic catastrophic, this mistake is a thorn in the eye of one of the biggest releases of the year.