It's en exfatAre you on fat32 or exfat? It’s starting to smell like corruption to me. Probably want to run h2testw on your card to make sure.
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Update: I managed to reclaim the space by running mac's disk utility first aid on the sd card, which apparently worked! It probably really was corruption. Any idea of how this might've happened, though?Are you on fat32 or exfat? It’s starting to smell like corruption to me. Probably want to run h2testw on your card to make sure.