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Portable vs. Internal Storage
There are two ways to use an SD card with your device. In the past, Android has traditionally used all SD cards as portable storage. You can remove the SD card from the device and plug it into your computer or another device and transfer files, like videos, music, and photos, back and forth. Your Android device will continue working properly if you remove it.
Starting with Android 6.0 Marshmallow, though, some phones can use SD cards as internal storage as well. In this case, your Android device “adopts” the SD card as part of its internal pool. It’ll be treated as part of your internal storage, and Android can install apps to it and save app data to it. In fact, since it’s considered internal storage, any type of app can be installed to the SD card–including apps that provide widgets and background processes. Unlike older versions of Android, it doesn’t matter whether the developer has disabled the “move to SD card” permission or not.
However, when you use an SD card as internal storage, Android formats the SD card in such a way that no other device can read it. Android also expects the adopted SD card to always be present, and won’t work quite right if you remove it. This method is useful if your phone doesn’t come with very much space to begin with, and you want more space for your apps and files.
In general, it’s probably most convenient to leave MicroSD cards formatted as portable storage. if you have a small amount of internal storage and desperately need room for more apps and app data, making that microSD card internal storage will allow you to gain some more internal storage. This comes at the cost of flexibility and possibly slower speed, if the card is slower than your device’s internal storage.
l'unico aspetto sconveniente e' che una volta formattata per un device la sd card diventa parte della memoria interna quindi non puoi rimuoverla e metterla su altro device o su un lettore di schede sd per pc perche viene crittografata per quello smart.