![]() ![]() This should be enough to support up to 4K video at lower bitrates. Most of the cards we tested had a V30 rating, so they have a sequential write speed of at least 30 MB/s. Most of these refer to the card’s speed class and performance ratings, which are determined by the SD Association.Ī card’s Video Speed Class, or V-rating, details its minimum sequential write speed, which is especially important when recording video from a camera. If you look at a microSD card, you’ll see a buffet of numbers, letters and symbols. But they’re important if you use a card with a gaming device or a single-board computer like the Raspberry Pi, where it often has to rapidly save and access small bits of data in random locations. Since random read/write speeds are much lower than sequential ones, storage device makers tend not to advertise them as loudly. Random performance, meanwhile, is about how quickly a card can read and write small files scattered throughout the device. If you want to use a microSD card for media storage, this is particularly important. Sequential read and write speeds matter when you’re trying to access or save long, constant streams of data, such as opening a large video or copying a big batch of files from a PC. These metrics can then be broken down into sequential and random performance. Generally speaking, most microSD cards have faster read speeds than write speeds. MicroSD cards are primarily judged on their read and write speeds, which are usually measured in megabytes per second (MB/s). This will almost never be an issue these days, but some older devices (a Nintendo 3DS for instance) are only compatible with microSDHC (High Capacity) cards, which range from 2GB to 32GB. Your device needs to support this for it to work with a microSDXC card. When we talk about microSD cards today, we usually refer to cards that use the microSDXC (eXtended Capacity) standard, which have a capacity between 32GB and 2TB. SanDisk says its 128GB Extreme card delivers sequential write speeds up to 90 MB/s, for example, while the higher-capacity models in the same line offer up to 130 MB/s. Note that a microSD card’s performance may differ depending on what capacity you buy. There’s a starker increase when you go up to 1TB cards, which typically cost around $100. These days, you can find a decent 128GB card for around $15 or less, a decent 256GB card for less than $30 and ( with sales) a decent 512GB card could be as little as $40 (though most cost closer to $50 or $60). But if you need more room – say, for stashing a bunch of games on a Steam Deck – a 512GB card could make more sense and often provides a better cost-per-GB ratio. 2TB cards are theoretically possible but still in the prototype stage.įor most, a 128GB or 256GB model should be the sweet spot between price and capacity. ![]() Modern cards are usually available in sizes ranging from 32GB to 512GB, while a handful offer 1TB models as well. The first thing to figure out when buying a microSD card is how much space you need. What to look for in a microSD card Capacity Another good option Lexar Professional 1066x (128GB) ![]()
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