Reusing adopted storage I have sdcard formated as adopted storage. I have also root and made a copy of encryption key which is in /data/misc/vold dir. I'm using it to access files on sdcard on PC with Linux. I'm planning to format /data partition and set up everything from beginning. Question is if I place same sdcard, with same content (formated previously as adopted storage) in phone and key file in /data/misc/vold from TWRP can I be able to access files on fresh system?
It works as expected. After wiping data partition and rebooting to system I made encryption of data partition as I always do. Then again reboot to recovery. I copied encryption key for sdcard (with the same content, I didn't format sdcard) to /data/misc/vold and make sure that file belongs to root.

After rebooting to system again I didn't have any notification about formating sdcard. One thing I had to do: move data to sdcard. And after this step, I can see all my content on sdcard, which was mounted as adopted storage.