SD cards come in different levels. If you look at your card there should be a number on the front of the card. the higher the number means the faster the card. If you have a level 6 card then you shouldn't have the problem of getting a busy signal. your photos are large files and if your card is slow ie a level 3 then it takes time for the data to copy to it. So find yourself a level 5 or 6 card and you shouldn't have this problem.
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