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+---
+title: Getting your SD card to detect on a Nintendo 2DS/3DS 
+summary: A fix for "Could not detect an SD Card. The software on the SD Card could not be displayed."
+time: 1690692039
+---
+
+So I recently got a Nintendo 2DS for homebrew reasons, and ran into this incredibly annoying error while trying to follow the guide laid out by the lovely people at https://3ds.hacks.guide:
+
+<figure>
+<img src="/img/2ds-sd-card/2ds.jpg" class="vertical">
+<figcaption>The home screen on my Nintendo 2DS, with some Miiverse thing on the top and the following error message on the bottom: "Could not detect an SD Card. The software on the SD Card could not be displayed."</figcaption>
+</figure>
+
+Googling around did not show anything fruitful, but I found a hint on this [Nintendo support page](https://en-americas-support.nintendo.com/app/answers/detail/a_id/220/~/how-to-format-an-sd-card-or-microsd-card), which claims that an SD card must be formatted with the official SD Association formatting utility. If you're on Windows or macOS, you should use [this tool](https://www.sdcard.org/downloads/formatter/) and that will probably format your card correctly. If you're on Linux or can't use this tool for some reason, read on.
+
+It turns out that:
+
+1. Your SD card must be formatted with an MBR (Master Boot Record)
+2. The partition type of your (presumably one and only) partition on the SD card must be FAT32
+
+Note that this doesn't _just_ mean your partition should be formatted as FAT32. It should be formatted as FAT32, _and also_ there's a "partition type" byte inside your MBR that should be changed to FAT32. On a Linux system with `fdisk`, this is how you'd do that:
+
+* Unmount but don't safely eject your SD card
+* Run `sudo fdisk /dev/sdX`, where `sdX` is your SD card
+* Type `t` to change your partition type, `1` to select your first partition, and `b` to make the partition "W95 FAT32" type
+* Type `w` to save and quit
+
+And now your SD card should detect fine and you should be able to homebrew it or play Nintendo-licensed games on it or whatever.
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