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"RE: GB Memory Card Limit 5100"
I use Lexar 600x 32GB cards. I had to format the first one twice, but it's worked fine since. Other card never had a problem with. I think like someone mentioned above, possible card corruption.Updated list of approved cards can be viewed here:http://support.nikonusa.com/app/answers/detail/a_id/17353/~/approved-sd-cards-for-d5100