It needs to be blank because when the card is converted to "Internal" storage, it will be formatted (wiped) and encoded (making the cards data only readable by that device). 1. Go to device "Settings", then select "Storage". 2. Select your "SD Card", then tap the "three-dot menu" (top-right), now select "Settings" from in there. 3. HEkJf9m.

samsung j2 prime memory card capacity