04/05/19

Micro Sd Card Ratings Explained

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 different speed classes, physical sizes, and capacities to consider.

Micro Sd Card Markings Explained
Understand Micro Sd Card Classification
Micro Sd Card Ratings Explained

Dec 18, 2018 - The plainly stated 'Class' number is the most immediate indicator to the speed of an SD card, with 'Class 2' (2MB/s) cards being toward the bottom of the barrel and best geared toward standard definition video work or less demanding loads, and 'Class 10' (10MB/s) cards being capable of recording or playing up to 4K. How to choose an SD card: SD card speed classes explained The next area of confusion is around speed classes. These are how different SD, miniSD and microSD cards are rated in terms of read.

Some devices—like cameras—may require an SD card for their primary storage area. Other devices—like smartphones, tablets, and even computers—may offer the ability to use an SD card to increase storage or make it mobile. However, different devices require different types of SD cards. Here are the differences you’ll need to keep in mind when picking out the right SD card for your device.

Speed Class

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Not all SD cards offer the same speeds. This matters for some tasks more than others. For example, if you’re a professional photographer taking photos in rapid succession on a DSLR camera and saving them in high-resolution RAW format, you’ll want the fastest SD card you can get so your camera can save them as quickly as possible. A fast SD card is also important if you want to record high-resolution video and save it directly to the SD card. If you’re just taking a few photos on a typical consumer camera or using an SD card to store some media files on your smartphone, the speed isn’t as important.

Manufacturers use “speed classes” to measure an SD card’s speed. The SD Association that defines the SD card standard doesn’t actually define the exact speeds associated with these classes, but they do provide guidelines.

There are four different speed classes—10, 6, 4, and 2. Class 10 is the fastest, suitable for “full HD video recording” and “HD still consecutive recording.” Class 2 is the slowest, suitable for standard definition video recording. Classes 4 and 6 are both deemed suitable for high-definition video recording.

There are also two Ultra High Speed (UHS) speed classes–1 and 3—but they’re more expensive and are designed for professional use. UHS cards are designed for devices that support UHS.

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Here are the associated SD class speed logos, in order from slowest (class 2) to fastest (UHS class 3):

You’ll probably be okay with a class 4 or 6 card for typical use in a digital camera, smartphone, or tablet. Class 10 cards are ideal if you’re shooting high-resolution videos or RAW photos. Class 2 cards are a bit on the slow side these days, so you may want to avoid them for all but the cheapest digital cameras. Even a cheap smartphone can record HD video, after all.

An SD card’s speed class is identified on the SD card itself—just look for the logo. You’ll also see the speed class on the online store listing or on the card’s packaging when purchasing it. For example, in the below photo, the middle SD card is speed class 4, while the two other cards are speed class 6.

If you see no speed class symbol, you have a class 0 SD card. These cards were designed and produced before the speed class rating system was introduced. They may be slower than even a class 2 card.

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Physical Size

SD cards also come in different sizes. You’ll find standard SD cards, miniSD cards, and microSD cards.

Standard SD cards are the largest, although they’re still pretty small. They measure 32x24x2.1 mm and weigh just two grams. Most consumer digital cameras for sale today still use standard SD cards. They have the familiar “cut corner” design.

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

microSD cards are the smallest size of SD card, measuring 15x11x1 mm and weighing just 0.25 grams. These cards are used in most cell phones and smartphones that support SD cards. They’re also 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 can’t plug a microSD card into a standard SD card slot. However, you can purchase adapters that allow you to plug a smaller SD card into a larger SD card’s form and fit it into the appropriate slot. Below, you can see an adapter that lets you use a microSD card in a standard SD card slot.

Capacity

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Like USB flash drives, hard drives, solid-state drives, and other storage media, different SD cards can have different amounts of storage.

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

To use an SDHC or SDXC card, you’ll need to make sure your device supports those standards. At this point, 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.

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

Image Credit: Ryosuke SEKIDO on Flickr, Clive Darra on Flickr, Steven Depolo on Flickr

If you run out of storage space on your phone or tablet, you’ll definitely want to find a way to get more. One of the simplest options is to insert a MicroSD card. Sadly, not all smartphones and tablets support MicroSD cards. If you have an iPhone or iPad, then you’re out of luck, but many Android smartphones and tablets do support them.

To see if your device accepts them, check the full specs for your phone on the manufacturer’s website, or look for a MicroSD card slot in your phone. On newer phones, they’re generally part of the SIM tray.

What to consider when buying a MicroSD card

There are a handful of things to consider when you’re choosing a new MicroSD card for your phone. Obviously, the price and capacity are going to be factors, but you also need to make sure that the type of card you buy is supported by your device and that it’s suitable for your needs.

SDHC and SDXC

Micro Sd Card Markings Explained

SDHC stands for Secure Digital High Capacity and SDXC stands for Secure Digital Extended Capacity. The only real difference is the range of data they can store. You’ll find that SDHC MicroSD cards range from 2GB to 32GB in size, while SDXC MicroSD cards can range from 32GB up to 2TB in size, though the biggest MicroSD card we’ve seen so far is 1TB.

Class and UHS ratings

The Class rating of a MicroSD card refers to its minimum transfer speed. UHS stands for Ultra High Speed. The new V class is for video. Here’s how the minimum speeds for different classes break down.

Class	Minimum Speed
2	2 MB/s
4	4 MB/s
6	6 MB/s
8	8 MB/s
10	10 MB/s
UHS 1	10 MB/s
UHS 3	30 MB/s
V6	6 MB/s
V10	10 MB/s
V30	30 MB/s
V60	60 MB/s
V90	90 MB/s

Most MicroSD cards are a lot faster than the minimum speed. A Class 10 card may offer 95 MB/s, for example.

Application Performance Class

The SD Association also has a standard, called App Performance Class, which is designed to highlight MicroSD cards that are suitable for use in smartphones and tablets. The A1 rating means that the card can manage random read input-output access per second (IOPS) of 1,500 and write IOPS of 500. The A2 rating indicates random read input-output access per second of 4,000 and write IOPS of 2,000. This is ideal for quickly opening apps and processing tasks. These A1 and A2 cards are worth looking out for if you intend to format your card as internal storage in an Android device, something Google calls “Adoptable Storage.”

How to choose a MicroSD card

You’re obviously going to want the highest speed, highest capacity MicroSD card you can get, for the lowest price. We would advise you to factor in the brand reputation and the reported performance and reliability. Check out the warranty terms, just in case something should go wrong. You also need to be careful where you buy. If you’re going to use Amazon or eBay, then read some customer reviews and watch out for fake MicroSD cards, because they’re disappointingly common.

Best MicroSD cards for your smartphone or tablet

We’ve picked out four of the best MicroSD cards for smartphones here, but the right card for you will depend on your device and your needs. You may want to look beyond this list, but we advise you to stick to well-known brands like Samsung, Lexar, SanDisk, Toshiba, and Kingston. All prices are correct at the time of writing, but the MicroSD card market moves fast, so expect them to change.

SanDisk Extreme 32GB ($17)

Understand Micro Sd Card Classification

Here’s a speedy SDHC card that offers read speeds of up to 90 MB/s and write speeds of up to 60 MB/s. This is a durable card with a lifetime warranty, and the reviews are overwhelmingly positive. It will have no trouble with 1080p video and can even handle 4K, though you may want a larger capacity if that’s what you’re buying it for. It is certified Class 10, UHS 3, and V30. It also comes with a handy SD adapter.

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Samsung Evo Plus 64GB ($24)

This SDXC card is rated as Class 10 or UHS-1 and offers transfer speeds of up to 80 MB/s. It’s a durable and reliable MicroSD card with a lot of positive reviews. It’s fast and efficient for use in phones and tablets and won’t have any trouble recording 1080p video, but you should opt for another card if you shoot in 4K. Ultimately, it’s a great all-arounder for a reasonable price.

Lexar Professional 128GB ($128)