I have a Nokia 6.1, and Android One phone, running Pie. Is there any way to tell if my SD card is already formatted for internal storage?
When you go to settings>device maintenance>storage (it might be a different path for you I'm running 8.0) does it list your inserted SD card? If not then it's not available.
df | grep /mnt/expand on a terminal app or
adb shell. If you see a
dm-crypt virtual volume like
/dev/block/dm-1 mounted on
/mnt/expand/[UUID] and additionally
/mnt/expand/[UUID] is mounted at
/storage/media, then your external SD card is adopted as internal storage.
/data/media mounted on
/storage/emulated, and your SD card is mounted as Portable Storage.
RELATED: What is /storage/emulated/0?