It sounds like you're running into issues with formatting your SD card, which is preventing you from using it with your Steam Deck. The problem might be that the methods you've tried in Windows don't actually erase the data, so the Steam Deck is still seeing remnants of files. To solve this, you could try using a tool specifically designed for formatting SD cards, such as the built-in formatting tool on your Steam Deck, or a third-party app like SD Formatter, which can securely erase all data on the card. This should help you get your SD card ready for use with your Steam Deck. Would you like me to elaborate on any of these steps?
The Steam Deck runs on the LINUX operating system and uses the ext4 file system, which is compatible with UNIX file and folder permissions. This means that SD cards formatted with NTFS or FAT32 will not be recognized by the Steam Deck.
If you're sure your SD card isn't physically damaged, you can try a method to fix it.
Step 1. Remove your SD card from Steam Deck
The first step to resolve the error is to remove the SD card from the Steam Deck and insert it into your PC.
Step 2. To format an SD card to FAT32 format using your PC, you can follow these steps: First, insert the SD card into a card reader and connect it to your PC. Next, open the File Explorer on your PC and find the SD card drive letter, which should be labeled as "Removable Disk" or something similar.
If the built-in formatter on your PC doesn't work, try using the Qiling Disk Master software, which supports various file systems including ext2/3/4, exFAT, FAT32, and NTFS.
Download this tool and click the link to learn how to format an SD card for Steam Deck.
Step 3. Put the SD card back into your Steam Deck
Once formatting is complete, place the SD card back into the Steam Deck, ensuring the slot is clean and the gold contacts on the SD card are free of damage or dust. This may resolve the issue and allow normal use of the card.