HarryBinNC Loc: Blue Ridge Mtns, No.Carolina, USA

In the roughly 14 years I have shot digital exclusively, I have constantly moved cards frrom camera to camera, and I have never had an issue with doing so, with the sole exception of the first generation Fuji x-100 - that camera would not share no matter what, and it almost demanded in-camera formatting every time the card was removed and replaced even if the memory card hadn't ever been anywhere else. However, all of the 3 later Fujis I own are just like the Canons, Nikons, Minoltas, Panasonics, Sonys, and even an early Pan-Leica in that I have never had an issue with camera memory hopping, and most of the times I have formatted in camera was to get rid of a bunch of old images quickly. I often have images from 4 cameras in the same card simultaneously.

HarryBinNC Loc: Blue Ridge Mtns, No.Carolina, USA

Yes, absolutely - and you can probably move the card without re-formatting if you already have some images from another camera that you haven't downloaded yet. My Better Half and I often go on long photo expeditions, and we do a lot of camera swapping, usually with at least 4 cameras. We always have about a dozen numbered 8GB cards for stills, along with sets of 32 and 64 GB High-speed cards for doing performance video, which are moved from camera to camera as we go along, with the cards filled up sequentially by number and date. We also take a laptop each and a couple of Passport USB3 portable drives that we use to backup each day's shoot every evening.

We don't ever format (ERASE) a card unless we have 3 copies of it - a copy on each portable drive and another copy on a PC. We very seldom erase a card while on the road. When we get back home we copy all of the new images to the Data Drive in my main PC, which is exclusively for processing media - stills, video and music. I do the required pp on the new stuff in the Data Drive, then copy the changes to the two backup drives as I go along. At the end of each work day, an off-line SATA is fired up and the day's work is added to it, then it is disconnected. We have some really spectacular lightning here, and the normally disconnected 4th drive copy is the fail-safe.