Memory Card Storage Capacity Table

By | June 19, 2022

Derek Brumby/

Secure Digital (SD) cards are used in digital cameras, music players, smartphones, tablets, and even laptops. But not all SD cards are created equal—you’ll find dissimilar speed classes, physical sizes, and capacities to consider.

Some devices, like cameras, may require an SD carte du jour for their primary storage area. Other devices, such as smartphones, tablets, and even computers, may offer the ability to use an SD card to increase storage or make it mobile. All the same, different devices crave unlike types of SD cards. Here are the differences you’ll need to proceed in mind when picking out the right SD carte for your device.


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Speed Classes

Non all SD cards offering the same speeds. This matters for some tasks more than others. For instance, if you’re a professional lensman taking photos in rapid succession on a DSLR photographic camera and saving them in a loftier-resolution RAW format, you’ll want the fastest SD carte you can get. This’ll allow your camera to salvage images equally quickly equally possible.

A fast SD card is as well important if you want to record high-resolution video and salve information technology directly to the SD bill of fare. If you’re merely taking a few photos on a typical consumer camera or using an SD carte du jour to store some media files on your smartphone, the speed isn’t as important.

Manufacturers apply “speed classes” to measure an SD card’southward speed. The SD Association that defines the SD card standard doesn’t actually define the verbal speeds associated with these classes, just they exercise provide guidelines.

There are iv different speed classes: 10 (10MB/sec read/write speed), 6 (6MB/sec), 4 (4MB/sec), and 2 (2MB/sec). Class 10 is the fastest, suitable for “full Hard disk drive video recording” and “HD still sequent recording.” Class 2 is the slowest, suitable for standard definition video recording. Classes 4 and six are both accounted suitable for high-definition video recording.

There are also ii Ultra High Speed (UHS) speed classes, one (10MB/sec read/write speed) and 3 (30MB/sec). These markers are mainly intended for devices designed for professional person use, just you’ll detect them on most of today’s SD cards.

And lastly, at that place are Video Speed classes. These classes include V90 (which supports upwards to 8K video recording), V60 (4K recording), V30 (HD/Total HD video), and V10 and V6 (standard video).

Here are the associated SD class speed logos:

SD Card speed symbols
SD Association

You’ll probably be okay with a course iv or 6 SD card for typical utilize in a digital camera, smartphone, or tablet. Class 10 cards are ideal if you’re shooting loftier-resolution videos or RAW photos. Form 2 cards are a chip on the ho-hum side these days, so you may want to avert them for all merely the cheapest digital cameras. Even a cheap smartphone can record Hard disk video, afterward all.

An SD card’s speed form is identified on the SD card itself—simply await for the logo. Yous’ll as well see the speed class on the online store listing or on the carte du jour’s packaging when purchasing it. For instance, in the below photo, the SD bill of fare has markers for speed class 10, UHS speed form 3, and video speed class 30.

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If you see no speed grade symbol, you take a class 0 SD menu. These cards were designed and produced before the speed class rating system was introduced. They may exist slower than even a class 2 carte.


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Concrete Size (SD, MiniSD, and microSD)

SD cards also come in unlike sizes. You’ll observe standard SD cards, miniSD cards, and microSD cards.

Standard SD cards are the largest, although they’re still pretty pocket-size. They measure 32x24x2.1mm and weigh just two grams. Most consumer digital cameras for sale today still utilise standard SD cards. They accept the familiar “cutting corner”  design.

miniSD cards are smaller than standard SD cards, measuring 21.5x20x1.4mm and weighing virtually 0.8 grams. This is the least common size today. miniSD cards were designed to be particularly small for mobile phones, but now that nosotros accept an even smaller size—microSD—miniSD cards aren’t too common.

microSD cards are the smallest size of SD card, measuring 15x11x1mm and weighing just 0.25 grams. These cards are used in near cell phones, smartphones, and drones that support SD cards. They’re as well used in many other devices, such as tablets.

Choosing a size is really just about what fits into the device you have. SD cards will only fit into matching slots. You lot tin can’t plug a microSD card into a standard SD card slot. Yet, you can purchase adapters that let you to plug a smaller SD card into a larger SD menu’s grade and fit it into the appropriate slot. Below, you can see an adapter that lets you use a microSD bill of fare in a standard SD card slot.

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SD card next to a microSD card and adaptor
Vitalii Stock/


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Capacity (Storage Size)

Like USB flash drives, hard drives, solid-state drives, and other storage media, SD cards tin can take unlike amounts of storage.

Merely the differences between SD card capacities don’t stop in that location. SD Standard Chapters (SDSC) cards range in size from 1MB to 2GB (and sometimes even 4GB—although that’s not standard). The SD High Capacity (SDHC) standard was created afterwards, and allows cards 2GB to 32GB in size. An even more recent standard, SD Extended Capacity (SDXC) that allows cards 32GB to 2TB in size.

To apply an SDHC or SDXC card, you’ll need to make certain your device supports those standards. At this bespeak, the vast majority of devices should support SDHC. In fact, the SD cards you have are probably SDHC cards. SDXC is newer and less common.

SDHC memory card in-hand
Nor Gal/

When buying an SD carte, you’ll need to purchase the correct speed class, size, and capacity for your needs. Be sure to check what your device supports and consider what speed and chapters you’ll actually need.


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