Could Not Mount This Device Steam Deck
Sounds like a classic case of the Steam Deck being a bit finicky. First, make sure you've fully updated your SteamOS. If updates don't solve it, you might be looking at a filesystem error. Try using a different USB port for any external devices, and if all else fails, you might need to reach out to Steam support for a deeper dive.
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You're plugging it wrong, mate. The Steam Deck is pretty straightforward. Check your connection and try again. Also, ensure the device you're connecting is compatible.
Just restart it. Worked for me when I had the same issue. Simple but effective.
Had this problem last week. Turns out, my external HDD needed reformatting to work with the Steam Deck. Make sure your device is formatted correctly and is actually compatible with SteamOS.
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