If you formatted that without doing it manually in a shell on android using certain sm (storage manager) commands, there is no way to access anything on the SD directly. When you create an adoptable storage, Android creates two partitions: An encrypted f2fs partition of almost the full size of the SD, and a second (ext4, I think?) partition containing some data about mounting and the encryption key. On Linux, you could mount the encrypted partition using that encryption key from the other partition, but that's a bit of an advanced task. If you format it on the shell using sm , you can set a percentage of how much is supposed to be adopted storage and how much is going to be normal public storage (it even puts the public partition at the beginning of the disk, as Windows unlike other OS cannot read removable medias' partitions past the first one). I sort of have this setup on my phone, however after updating to a newer Android version it stopped seeing the public partition that used to be seen as normal external SD storage.