Buying Guide for the Best Micro Sd, Sdhc and Sdxc Cards for Smartphones in 2019

Maj. February 25, 2019 at 5:32 pm

Many smartphones are compatible with micro SD, SDHC and SDXC cards. But choosing the right one isn’t always easy, so how do you know which models are right for you? Our buying guide will not only help you recognize the right cards, but also offers you recommendations for products of proven quality.

Smartphones are taking more and more internal storage space on board, but it’s not always enough. Increasingly heavy applications, photos, music, videos: all of these files quickly fill the memory of the smartphone, especially if it is an entry-level or mid-range device with only 16 or 32 GB. Fortunately, storage space is very often expandable via micro SDcards. But choosing them isn’t necessarily easy.

Micro SD, SDHC, SDXC, write and read rate, so much information that can quickly make our heads spin. In this buying guide, we will not only teach you how to understand all these criteria, but also provide you with purchasing recommendations to find the perfect card for your needs.

Buying Guide for 32, 64, 128, 256 and 400 GB SD Cards

Here are the best SD cards currently available. They have an excellent price/quality ratio and are a must on the market. Be aware that while 400GB cards are available, they are not compatible with most smartphones, so check your device’s compatibility before making a purchase.


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32 GB SD Card: SanDisk Ultra

sandisk sd card 32 go

At 32 GB, the SanDisk Ultra card is the most attractive price/performance ratio for anyone who wants to store photos and record small Full HD videos first and foremost. It should be noted that SanDisk also has fun to add additional certifications like “A1” to emphasize the loading speed of the applications, but only class 10 really matters.

32 GB SD card U3 / V30: SanDisk Extreme

If you plan to record 3K videos, class 10 will not be enough for you. In 32 GB, you can thus turn to the SanDisk Extreme which emphasizes via the certification “V30” that it is well able to record in 4K without problem. This V30 is finally just another way of saying that the card belongs to the U3 class, and promises a read rate up to 100 mb/s and a write rate up to 60mb/s.

64 GB Card: Samsung MB-MC64GA/EU

For 64GB cards, the best value for money is none other than Samsung EVO Plus cards, which promise increased durability with the added bonus of a U3 class offering up to 100 mb/s read and 60 mb/s write. Enough to shoot 4K movies without any problem.

128 GB Card: SanDisk Ultra

sandisk sd card 128 gb

We also find alternatives to Samsung at Sandisk which offers a 128GB version with transfer rates of to 100MB/s. A good solution for those looking for a high-performance microSD card that is capable of storing a large amount of data.

Click here to buy SanDisk Ultra 128GB at Amazon

256 GB card: Samsung MB-MC256HA/EU

Double the storage space again for the same performance. Once really much more expensive than their 128GB counterparts, they now offer better value for money than a few years ago 256 GB cards are starting to become more and more popular, and this one remains one of the most powerful cards available today. Given its price, make sure you need as much storage space as possible before investing.

256 GB card: SanDisk Ultra

sandisk sd card 256go

We’re taking it up a notch in terms of capacity, as we’re getting the 256GB SanDisk Ultra , which has the same technical features as its 128GB little sister. Some devices may be incompatible with such a capacity, it is wise to check that your smartphone, tablet, action cam… accepts such a generous microSD card.

Click here to purchase the SanDisk Ultra 256GB at Amazon

400 GB Card: SanDisk Ultra

sandisk 400 go

Are you looking for monstrous storage capacity? This is the SanDisk Ultra 400GB. At this stage, you will have to check the compatibility of the hardware to avoid ending up with an unusable microSD card. With a price tag of over 250 euros at the time of writing, it is clear that this is expensive but it will more than meet your “huge” storage needs.

Click here to buy SanDisk Ultra 400GB at Amazon

What’s the difference between micro SD, SDHC and SDXC cards?

The first thing to know is simply the meaning of the acronyms SD, SDHC and SDXC, the first brake when it comes to Flash memory In truth, it’s very simple: these names do not indicate a different technology between each memory, but simply their maximum size.

  • micro SD: microSDs have a maximum capacity of 2GB, but they are the most compatible, as they can be used in any device.
  • micro SDHC: These cards have a capacity between 2 and 32 GB and can only be used in devices that support micro SDHC and micro SDXC cards, but not older devices that are only compatible with micro SD cards.
  • micro SDXC: these cards have a capacity of over 32GB and can theoretically go up to a staggering 2TB. High-capacity micro SDXC cards are not necessarily compatible with all devices.

So there’s really nothing to worry about on this side: you can talk about SD cards all the time to make things simpler. The point you should pay attention to, however, is the maximum capacity accepted by your phone. Nowadays, most smartphones accept SDXC… but will not necessarily be compatible with future 2TB cards. Many of them stop at 256 GB of recognized storage: this information is given in the data sheet of the devices.

Your SD card will serve as your storage memory, which means that your smartphone will read the information it contains as well as write new information to it. Also, its reading speed (the time it takes the system to read the information) and writing speed (the time it takes the system to record new data) must be efficient, so as not to slow down your use. A slow SD card is a slow smartphone after all.

Reading rate

There is a simple bill of material to define the read rate:


up to 12.5 mo/s


up to 25 mo/s


up to 104 mo/s


up to 312 mo/s


from 312mo/s

These are certifications that you will find on the packet of your SD card, and which will tell you at a glance the theoretical rates found in laboratory tests. However, they are not necessarily indicative of the actual rate, just a first indication.

Writing rate

To define the posting rate, a class system exists:

Class 2

minimum 2 mo/s

Class 4

minimum 4 mo/s

Class 6

minimum 6 mo/s

Class 10

minimum 10 mo/s

Class U1 (or class 10)

minimum 10 mo/s

lasse U3 (V30 for the video)

minimum 30 mo/s

As you will have noticed, from class 10 onwards, the UHS (Ultra High Speed) comes into play. Please note that you may also see “V30” on some cards, which is a nomenclature used only for video recording. Note that “V30” is actually equivalent to the U3 class, and simply means that it is possible to record live video in Ultra HD.

Why pay attention to read and write rates?

Of course, as said before, these rates will influence your experience on your smartphone, since a bad SD card could slow it down. But you also have to consider your type of use. For example, recording photos directly to your card does not necessarily require enormous speed; recording 4K videos, on the other hand, requires a substantial writing speed, just as much as playing back the resulting videos.

Storing applications on an SD card will also be a problem if the SD card is not very fast. Whatever you choose, be aware that it will always be slower than your phone’s internal memory. Also, storing applications on an SD card will slow them down a bit naturally, and a bad card will make the experience truly frustrating. We invite you to consult our file on how to choose the right microSD card for more information.

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