Just look for a small “10” inside of a “C” on the front. Speed ClassĪlmost any SD card on the market will be labeled Class 10 - there are a few lingering Class 4 cards you can find brand new, but for the most part, they’re all Class 10. They aren’t significantly more expensive anymore, and you’ll be happy you did, even if just for the decreased transfer-to-computer times. Unless you are a pure hobbyist or on a tight budget, we highly recommend getting a UHS-II card. Likewise, if your camera features dual card slots, but only one is UHS-II, your write speeds (and buffer dumping) will be bottlenecked by the slower UHS-I card slot if you choose to save to both cards as a backup. In other words, UHS-II will run at UHS-I speeds in a UHS-I slot (the same goes for a UHS-I card reader). While you can use a UHS-II card in a UHS-I slot (and vice versa), you will only see the benefits of a UHS-II card when used in a UHS-II slot. Some lower-end cameras use UHS-I exclusively. Many mid to high-end cameras feature one or even two UHS-II slots, while some feature one UHS-II slot and one UHS-I slot, or even just a single UHS-II slot. In short: faster is better, but only if you have a camera capable of making use of it. There’s also UHS-III, but nothing on the market uses that specification yet (and it doesn’t seem likely that anyone ever will). UHS-II has a second row of pins and uses Low Voltage Differential Signaling Technology, allowing for read speeds up to 312 MB/s. There are two types of SDHC or SDXC cards - UHS-I and UHS-II. The only difference between the two is that SDHC cards top out at 32GB, while SDXC (eXtended Capacity) cards can store up to 2TB. Most SD cards made today are SDXC - Adorama lists 34 SDHC cards on its site, while SDXC stock clocks in at 147. With SD cards, we want to look at several attributes: Photo from the SD Association SDHC Versus SDXC Similarly, it’s very common for a camera to feature an SD slot alongside another card type, like CompactFlash or CFexpress. The diminutive size also allows manufacturers to implement dual card slots in even very compact bodies. They’re cheap, small, and can be quite fast. To this day, SD cards remain the most used form of storage for digital cameras.
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