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I am using this 64 GB card onSamsung Galaxy Note II N7100 Unlocked GSM International Version White. I coped over 50 GB podcasts/music. It took several hours to copy from a 3 year old laptop. After copying, the inbuild Samsung's music player recognized all and playing is very smooth. The card looks super fast, no reading. After booting the phone, the music is indexed almost immediately and I can play. I have attached a screenshot which shows only 59+ GB is available. The 5 GB seems lot to be missing. I am assuming it is used for storing some index information/some restore information.