SD cards have these size types (check the camera manual and card reader for types the camera supports): The card recommendations in your camera or card reader manuals will mention UHS-1 or UDMA-7 if supported. They will always work fine, they just run at the slowest speed supported. These faster cards(of same type) are backwards compatible with older cameras, and vice versa. There are now UHS-1 (Ultra High Speed) SD cards, and UDMA-7 Compact Flash cards, which are newer and faster, and are supported in newer cameras or card readers if so specified. This will be maximum Read speed, Write will be slower (and your expected actual write speed will be difficult to determine when buying, and the speed in the camera is likely less than the speed in a computer). Some of the faster cards have finally started just specifying the fastest speed as megabytes per second (MB/s). Above 200x, the card will require a USB 3.0 port to ever see its full read speed. This is Read speed, Write speed will be slower. X ratings (used by Compact Flash cards): 400x means 400 times faster than the old first CD players which were 150 KB/second (which seems a pointless comparison today, but flash memory is older than digital cameras). Another factor is that many SD cards today have a UHS-1 interface, and are faster. I don't know why Class 10 is still the highest number used, but it is a minimum (more recent faster cards have adopted the X megabytes per second ratings). That will be Write speed, because Read is faster than Write. Newer, faster, and promise significantly faster in the future.Ĭlass ratings (used by SD cards): Class 10 means 10 MB per second minimum, and it means the slowest of Read or Write will be at least the 10 megabytes per second. These have been the faster card, until XQD. Your camera has to be designed to specifically accept them, and their sub-type. There are three major types of memory cards used by cameras (each fits a different unique socket, NOT backwards compatible). The Read and Write speeds are different, NOT the same number (the camera writes, your computer reads). There are different ways it is specified and advertised. Memory Card Speed - How much does the camera need?
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