Our pick. Upgrade pick. Everything we recommend. Who should get this. How to avoid counterfeit cards. How we picked. The most important features of an SD card are speed, reliability, price, and warranty. This is what you should look for in an SD card:. The other speed classes are 2, 4, and 6, which also denote the minimum write speed in megabytes per second. All the point-and-shoot cameras we recommend support at least UHS-I bus cards. If you need more room to store your media, many GB SD cards cost about the same per gigabyte as their 64 GB counterparts.
Check your device to confirm it supports SDXC extended capacity cards meaning cards 64 GB and higher before buying one. If not, stick with 32 GB to ensure that your card works with your device. Most cards now have their Video Speed Class rating included on the label. The SD cards we tested ranged from V30 to V How we tested. Upgrade pick: Lexar Professional x 64 GB. The competition. UHS-II cards. Frequently asked questions. What brand of SD card is most reliable?
What are the fastest SD cards? How do I choose an SD card? About your guides. Eleanor Ford. Cards in higher classes can transfer data more quickly in most cases, although this can depend on the card reader. The classes also are set by the minimum DTS, not the maximum, and a user may get much better performance. It's best for the user to test the writing speed of his device and use the recommended class, however, because this performance can be critical for users.
Cards in the higher classes are useful for people who want to record high definition HD video or save many high resolution photos. Someone trying to record high definition video onto a slower memory card, for example, may find that he does not get the quality he expects, if the video records at all.
Most experts recommend Class 6 for HD purposes; its speed is typically fast enough for most recordings and it's less expensive than a Class 10 card. A 32 GB card can hold 4, megapixel photos compressed or photos of the same size and quality uncompressed. But this is because the performance is only unlocked if the device using the card fully supports it. The table below shows how various cards will function in different UHS card readers, and indicates how SD Express would compare.
Not shown in the very first table is yet another category rating. The increased use of SD cards in smartphones and tablets, where the additional NAND flash can be used as working storage, requires more than just good throughput. Cards rated A1 are capable good for a random read performance of IOPS and random writes of IOPS, while A2 significantly increases that, although this does require very specific hardware support.
For example, a smartphone will only need something from the first category, whereas a high end camera or video recorder, used by a professional photographer, will want to consider something from the other two.
Although this guide should have equipped you with the information you need to pick your own SD or microSD card, we went ahead and chose models for the three categories that stood out as offering the best combination of specification and price. You may have noticed Samsung's dominance in the flash drive market if you've upgraded your computers with a solid state drive over the years and there's a good chance that the company's memory chips are in your smartphone.
That being the case, it shouldn't come as too much of a surprise to see a Samsung-branded microSD card listed here. For a wide majority of users, the best value cards will be fast enough and will offer plenty of storage. However, for more specialized use and if top-end performance is required , make sure you are buying a card that's right for the task, and that your device can take full advantage of the card's rating.
If you want fast storage for a smartphone or tablet, you should be more concerned about fast random access and reading small files simultaneously. For movie recording on drones and video equipment, you want a card with the highest rating UHS-II V90 but those are not available in the microSD format. Larger versions of the same model are also available.
If you simply need the maximum amount of storage you can get, your options are more limited in the microSD side as you might have come to expect. However, if you're routinely shooting 4K video, then you'll welcome the 1 TB capacity.
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