Kingston 32 GB microSD Class 10 Card Review
Testing the cards in a DSLR
For this test we used a Nikon D5100 DSLR, which is one of the latest consumer mid-range DSLR models. The Nikon D5100 has a really large memory buffer which allows shooting of a large number of JPEGs continuously. It is possible to shoot 100 JPEGs continuously and about 14-15 RAW files. For a better understanding of why you would need a faster card in a DSLR, please watch the following video as it explains this best.
We were able to shoot about 100 JPEGs on each of the cards but the difference was in the recovery time like shown in the video above. While the recovery was almost instantaneous on the class 10 card, it took about 8 seconds with the class 2 card. We saw similar performance while shooting RAW files too. It took longer for the class 2 card to finish writing the RAW files to the card.
This article gets to the point