Memory cards have been changing in others ways, due partly to shifting standards, particularly in terms of video capture. Before you buy a new memory card you'll need to consider how much video you'll be shooting, and in what format—HD or memory-intensive 4K.
The first step is to figure out what card format your camera or smartphone accepts, which can usually be found in the owner's manual or on the manufacturer's website.
There are three SD formats: SDXC, SDHC, and SD. If you shoot video, you'll most likely need an SDXC card, which is the newest type and has a maximum capacity of 2TB—which is huge.
SDHC cards have a capacity ranging between 2GB and 32GB—bigger is better if you're shooting video. SD is the oldest format and has a maximum capacity of just 2GB, so it's primarily used for still photos.
Some devices, such as smartphones and tablets, use smaller Micro SD cards for storage. These tiny cards usually come with an adapter that allow them to be used in devices that take full-sized SD cards. The same specs apply to these cards as to their larger brethren.
Though you can buy SD cards in the drugstore or even a supermarket, you're likely to get a better value and selection if you shop at a camera shop or an electronics store. If you're not sure which card you need, you might bring your device with you when you shop.
If you're shopping online, beware of counterfeits. Some consumers have been fooled into what seemed like a great deal on a fast 32GB card only to find out that it was a re-labeled 8GB card that just didn't work. If you're ordering from Amazon, protect yourself by making sure the product is shipping directly from the manufacturer rather than from a potentially sketchy third-party vendor.
Source: Which SD Memory Card Do You Need for Your Digital Camera?
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