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Re:Western Digital unveiled its SanDisk 1TB SDXC card prototype by soylentcola on Tuesday September 20, 2016 @10:37AM (#12539840)
Yep. My several-years-old prosumer Nikon (D7000) has two slots and I can configure them either as mirrored for redundancy, overflow in case I misjudge how much storage I need, or I can use one for RAW and one for JPEG in case I need to show a preview before I get a chance to process the RAWs.

Typically I just have it set as mirrored since I only shoot occasionally as a hobbyist and a corrupted card is the most likely "fail state" I'd encounter.

Re:Western Digital unveiled its SanDisk 1TB SDXC card prototype by penguat on Wednesday September 21, 2016 @06:47AM (#12546965)
I use my second slot for JPG, reasoning that I can get good enough results out of a JPG if I desperately need it - and the cheaper, slower, bigger card I put in the backup slot will hold a couple of days' shooting as JPG and not slow the camera down.