The best and most effective way to check whether the card is sufficient : Such as TF16G show 14.9G capacity card copy 14G or so information (files, songs, movies) into, and then delete the computer in the lower right corner of the hardware pull out the card reader, re-insert the card reader to copy the information to see if all the information Normal, if the normal description has reached the actual capacity, if the upgrade / expansion memory card is only the actual capacity (128/256/512 / 1G / 2G) upgrade capacity can be used, behind the copy of the information are virtual, can not use Extract, or damage!