

Once you format your external SD card as internal storage on Marshmallow, it can only be used on the same device then. This also makes your SD card secure and ties it to your device only. One of the most beautiful feature on Android 6.0 Marshmallow is that you can use the external SD card as internal storage on your device. Meaning the system will secure and adopt the SD card as its own and hence lift all restrictions as to access from apps, and most importantly, it’ll completely shift the app storage burden on internal storage to the SD card.
