How to Format SSD for Steam Deck
First, connect the SSD to your PC. Open Disk Management, right-click the SSD, select 'Format,' and choose the file system (exFAT is a good choice).
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Just plug the SSD into your Steam Deck, go to System > Storage > Manage Disks, and format it right there. So convenient!
Honestly, I'd skip formatting unless you really need to; the Steam Deck handles most file systems just fine.
Plug the SSD into your Steam Deck, boot into Desktop Mode, use KDE Partition Manager to format it to ext4. Easy-peasy!
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