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What Android version do you have?
First, you should reflect upon your reasons for wanting to format an SD card as internal memory.
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you will not be able to pull the card out and hook it up to your computer as it will be encrypted and the computer will not recognize it.
Actually it has drawbacks, which is why not everyone might wish to do so. As has already been said, it increases wear on the card, and by a lot more than the old "move to SD" option did (that would only move static elements of an app, so you get more reads but not many more writes. Formatting to internal means the phone can move app data and caches, which are frequently updated, to SD, which will increase writes and hence wear). Another is that once the card is formatted as internal you cannot transfer it to another device: being encrypted it won't work in another device unless you reformat it first. This may matter to some people and not to others, but it's worth thinking about the possible uses. And finally, even a fast card is slower than internal storage, and this may impact on phone performance (more likely to be noticable on a flagship than a lower-end device).to obtain more free space. No offense but I thought this was obvious as everyone should do this when they get a new Android device. Especially to move apps to the SD card.
when you format as internal, then that is all you will have as your storage. you will not be able to pull the card out and hook it up to your computer as it will be encrypted and the computer will not recognize it/QUOTE]