Author: Harry Guinness / Source: howtogeek.com

Modern digital cameras all write the photos and videos you take to removable storage cards, but which ones do you need? Let’s look at which SD cards—and CompactFlash, CFast, or XQD cards—are right for you.
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Which Format Should You Buy?

The most important thing is to make sure you buy the right format card for your camera. There are four main form factors of card your camera could need:
- SD, SDHC cards, and SDXC cards
- CompactFlash cards
- CFast cards
- XQD cards
SD, SDHC, and SDXC cards (generally all just grouped as SD cards) are by far the most common; the vast majority of consumer digital cameras use them. SDHC (Secure Digital High Capacity) and SDXC (Secure Digital Xtra Capacity) are just newer versions of the SD (Secure Digital) standard that support larger storage capacities and faster processing speeds. If you’re using a new-ish digital camera, the chances are it takes SD format cards, and it should support all three versions. If your camera is a bit older, check the manual. It may only support SD and SDHC—or if it’s ancient, just SD cards.
Different professional cameras might use CompactFlash, CFast, and XQD cards. CFast and XQD are competing successors to CompactFlash although they’re not backward compatible. It’s pretty unlikely your camera needs one of these formats but if you’re in doubt, check the manual or look at the card slots; they’re almost always labeled in some way. If your camera does take one of these formats, it may also have a second SD card slot.
What Speed Card Should You Buy?

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