I want to know whether my internal storage is formatted as exFAT, FAT32, ext4, etc.
How can I tell?
I run rooted Android 5.0, if it matters.
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mount | grep "/data"
The output will have something like
/emmc@usrdata /data ext4 rw,nosuid,nodev,noatime,discard,noauto_da_alloc,data=ordered 0 0
The third column tells you the file system used (in the example above:
Of course there are also several 3rd party apps offering you such insight :)