I decided to use Samsung Pro Samsung 64GB PRO Class 10 Micro SDXC up to 90MB/s with adapter (MB-MG64DA/AM) as the main card for my two Nikon D610 cards and saved some money on the second card and ordered PNY Elie Performance PNY Elite Performance 64GB High Speed SDXC Class 10 UHS-1 Flash Card up to 90MB/s - P-SDX64U1H-GE (both 64GB SDXC UHS-1 Cards). The Samsung Pro 64GB SDXC UHS-1 card arrived in a blister pack with no storage box. On the other hand, PNY comes with a decent case. My Nikon D610 will be busy with both anyway. small detail. ATTENTION! As you can see in the video, the plastic bracket extends far enough around the Samsung Pro card. Be VERY careful when opening the blister pack. This holder is as solid as the card itself. I've seen reports of people breaking the card in the process. Use a sharp knife to remove the entire holder from the paper envelope. Here's a performance comparison: Read speeds are pretty close on both at almost the same 92MB/s. Samsung shows write speeds of 80MB/s, while PNY is 22% slower at 62MB/s. While Samsung is considered the more reliable of the two, I think the PNY card is a great hit for the money - a great backup card for a dual card camera. Let time see any underwater problems that may arise in the future. So far I'm happy with the camping.
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