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You might have to tell steam specifically to look at the HD you're mounting.
I think external HD is actually a better solution than SD because data transfer speeds with a SATA-style SD external over USBC or 3.1 is going to be like 5-10 GBPS and that's faster than the SD card slot.
I think Valve is using the SD card by default because NVMEs were super expensive when Deck launched (coming down a lot now just a few months later). Basically they expect you to run the OS and maybe the primary game you play from the NVME and push ur library off onto the SD. And SD is super portable because this is a handheld.
If you can figure some way to carry an HD around it's probably a better experience. Linux can brick SD's also and SDs are expensive/GB storage. Whereas I got a 500GB SATA SD/HD for $25.
The official Valve dock has 3x USB 3.1 ports and you can daisy-chain hubs too.
https://steamdeckhq.com/tips-and-guides/external-storage-steam-deck/
https://steamcommunity.com/discussions/forum/1/558747288217753613/
If the external drive has such a partition or is formatted in Game Mode, it should work, but I have not tested this.
Thanks. That 2nd link I posted has some pretty involved stuff to get it to work. Was wondering if it was outdated.