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best sdxc cards

The Best SDXC Card in 2021

Author: Robert Wilson

Electronics & Peripherals Expert

A memory card is essential for storing various data. Whether you want to organize and store professional photos, vacation videos or just documents for work, there is no getting around using a memory card. An SDXC card, as the latest version of memory cards, is an option for storing various data.

In the following SDXC card test we want to help you to find the most suitable SDXC memory card for you. For this purpose, we compared SDXC cards in different sizes (classic and micro SDXC cards) and storage technologies (UHS-1 and UHS-2).

SDXC cards are one of the most recent versions of memory cards. They have a storage capacity of 32GB to 2TB and reach a reading speed of up to 300MB / s.

SDXC cards can be divided into classic and micro SDXC cards based on their size. On the other hand, they can also be divided into SDXC cards with UHS-1 and UHS-2 storage technology based on their storage technology.

When buying an SDXC card, you should consider the physical size (also called form factor), the storage technology, the storage capacity, the read and write speed and some other special properties.

Best SDXC Cards

Best all-round SDXC card

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The SanDisk Extreme Pro SDXC card offers a write speed of up to 90MB / s and a read speed of up to 170MB / s. This means that even 4K videos can be recorded. The SanDisk Extreme Pro SDXC card is available in all possible storage capacities from 32GB up to 1TB.

The card is also temperature-resistant, waterproof, shockproof and X-ray proof, so it is also ideally suited for use in all possible framework conditions.

Best all-round micro SDXC card

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The micro SDXC card from SanDisk Extreme offers a read speed of up to 160MB / s and a write speed of up to 90MB / s, as well as the video speed class 30. This makes it even suitable for recording 4K videos.

The card is also well suited for use in action cameras thanks to its temperature resistance, waterproofness and impact resistance. The scope of delivery also includes an SD adapter, thereby expanding the possible range of applications.

Best SDXC card with UHS-2 technology for little money

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The SDXC card from Lexar offers a particularly high read speed of up to 250MB / s and a write speed of up to 90MB / s. Lexar memory cards are available in 64GB, 128GB and 265GB capacities. It is therefore optimally equipped for full HD recordings as well as 3D and 4K videos in excess length.

A good UHS-2 SDXC card is definitely worthwhile for photographers who want to take photos with a particularly high resolution and therefore ideally also have a camera that is compatible with UHS-2 technology. The SDXC card from Lexar offers above all a good price-performance ratio.

FAQ’s: SDXC Cards

If you want to get yourself an SDXC card, there are certainly some questions that you want to have answered for yourself before making a purchase decision. In our following guide we answer the most frequently asked questions about SDXC memory cards so that you can find the most suitable SDXC card for you.

What is an SDXC card?

An SDXC card is a memory card that can be integrated as a subtype of the classic SD card. The card is basically an evolution of the original SD card and the latest version.

SDXC stands for Secure Digital eXtended Capacity and thus for the highest storage capacity on the market. The cards usually have a size of at least 32GB and should be able to store up to 2TB of data. SDXC cards also achieve a speed of 300MB / sec when transferring data.

An SDXC card is the most advanced version of the classic SD card.

What alternatives are there to SDXC memory cards?

There are various alternatives to the most modern version of SD cards, i.e. SDXC cards. On the one hand there are, for example, the predecessors of the SDXC card that are still represented today, namely the classic original, the SD card and the SDHC card. However, the simple SD card is only rarely used due to its significantly lower performance compared to its successors.

SDXC cards as the successor to the SDHC card and the original SD card.

The SDHC abbreviation stands for Secure Digital High Capacity. This card can already store much higher amounts of data than the original SD card, but is still inferior to the SDXC card in some points. Apart from the performance, the SDHC card differs only minimally from the SDXC card.

There are also MMC cards that are the same size as SD cards, but do not have the same performance. They are a predecessor of the SD card and are being replaced more and more by SD cards. A card reader for SD cards can also accept MMC cards, but the reverse is not possible. When using SD cards, you should make sure that you do not have a reader that is only compatible with MMC cards.

Apart from SD and MMC cards, there are also Compact Flash memory cards. These are slightly larger than SD or MMC cards and are mainly used in various cameras that are Compact Flash compatible.

Who should use a SDXC Card?

SD cards in general are particularly suitable For storing image and video material, as SD cards, unlike other storage media such as USB sticks, fit ideally in most cameras.

Ideal for photographers to save image and video material with high resolutions.

Whether an SDXC card is suitable for you also depends on the amount of data to be saved. So if you want to record pictures or videos in high resolution (e.g. 4K videos or Full HD), you need a higher storage capacity and a higher speed. An SDXC card can guarantee this optimally.

SDXC cards are particularly useful if you also have a reader that is SDXC compatible and ideally equipped with USB 3.0. The performance of the memory cards can best be guaranteed on these devices.

A good SDXC card with high storage capacity and high speed is particularly worthwhile for photographers.

What do you need to use it?

Basically, an SDXC card should work in any reader that was built after 2010. However, in order to be able to use the full capacity of the SDXC card, you should have a fully compatible reader that is equipped with USB 3.0.

Of course, it also makes sense to have, in addition to a camera or smartphone, a work device (i.e. laptop / notebook / PC / …) that can also accommodate an SD card, i.e. has an SD slot. If necessary, an external card reader can also be used for this. Such a device can hold various storage media and is connected to the computer via a USB cable.

Types of SDXC Cards

There are two basic factors by which SDXC cards can be distinguished, namely form factor and storage technology. These factors differentiate SDXC cards into classic & micro SDXC cards (form factor), as well as UHS-1 and UHS-2 cards (storage technology).

  • Classic SDXC card
  • Micro SDXC card
  • SDXC card with UHS-1 storage technology
  • SDXC card with UHS-2 storage technology

As the name “form factor” suggests, the classic and micro SD cards differ primarily in their physical size and, as a result, in their compatibility with certain devices.

In the following, the advantages and disadvantages of the classic and the micro SDXC card are compared, as well as the advantages and disadvantages of UHS-1 storage technology in contrast to UHS-2 storage technology.

Classic SDXC Card: Advantages & Disadvantages

An SDXC card in the classic format of a postage stamp can easily be used in most devices. It is considered to be the universal and most common form of SD cards. It can be used in notebooks, cameras, game consoles and many other devices.

Such a card can also have additional functions, such as an integrated WiFi module for mobile WiFi access. In addition, classic SDXC cards often have a switch for setting write protection.

A disadvantage of the classic SDXC card is that it cannot be used in smartphones.


  • Can be used universally for most devices (since 2010)
  • Integrated write protection switch


  • Cannot be used in smartphones

Micro SDXC Card: Advantages & Disadvantages

A Micro SDXC card is the smallest version of the SDXC card and can be optimally used in smartphones and a few cameras (especially outdoor cameras). The micro SDXC card is especially small, not much more than one cm2.

A disadvantage of the micro SDXC card is that it does not fit into many devices. This probably the biggest disadvantage can be overcome with an additional adapter. With an adapter, the micro SDXC card quickly becomes a classic SDXC card and fits into most devices. Such an adapter is also often supplied with a micro SDXC card.


  • Ideal for smartphones
  • Can be used for all devices together with an adapter


  • High risk of loss due to small size
  • Can only be used in a few devices without an adapter

SDXC Card with UHS-1: Advantages & Disadvantages

An SDXC memory card with UHS-1 storage technology is primarily characterized by its number of contacts, namely 9 pieces. This number doesn’t say too much about the actual reading or writing speed. It does, however, impose a certain limitation. Memory cards with a UHS-1 memory technology can thus have a maximum reading speed of 150 Mbit / s. Such a speed is sufficient for most activities.

A big advantage of the UHS-1 card is that it can be read by all devices.


  • Can be read by all devices
  • Sufficient speed for most activities


  • Only limited speed possible
  • Not suitable for high resolution recordings (6K or 8K videos)

SDXC Card with UHS-2: Advantages & Disadvantages

In contrast to the UHS-1 storage technology, the UHS-2 storage technology is primarily characterized by a second row of contacts. This additional number of contacts enables a higher reading speed of up to 312 Mbit / s.

A major disadvantage of UHS-2 cards is that not all devices can read such memory cards. In addition, the cards are often much more expensive.


  • Very high speed possible
  • Ideal for high resolution recordings (e.g .: 6K or 8K videos)


  • Currently only readable by very few cameras
  • Mostly very expensive

SDXC Cards: Purchase Criteria

In the following part we will show you some factors that you can use to decide on a suitable SDXC card. These criteria include:

  • Storage capacity
  • Physical size / form factor
  • Storage technology (UHS-1/2)
  • Write and read speed
  • Other properties

Storage capacity

The most important decision is the storage capacity of the SDXC card. An SDXC card can store between 32GB and 2TB of data, depending on the storage capacity.

You should choose the storage capacity depending on the amount of data you want to save. For photos and videos with very high resolutions, you need more storage space and should therefore use a card with a higher storage capacity.

Physical size / form factor

Depending on which devices the SDXC card is to be used for, you have to consider which size is required.

For use in smartphones, e.g. a micro SDXC card is required to supplement the existing storage space. In contrast, most other devices require a classic SDXC card. In any case, you should check which card size is required on the device in advance.

For universal use in smartphones and notebooks, the purchase of a micro SDXC card in combination with an adapter for the classic SD card has proven itself. This is often included with the purchase of a micro SD card.

Attention: Not all devices have an SD slot! Accordingly, an additional card reader is required for such devices.

Storage technology (UHS-1/2)

Basically, it can be said that UHS-1 memory cards are sufficient for most activities, as they already allow a high reading speed and can be used in all devices. Such a high speed is only required to create 6K or 8K films and there are very few cameras for that.

However, if you have a device that is already UHS-2 compatible, such a memory card is worthwhile, especially if the desired images and videos are to have a high resolution.

Write and read speed

Classifications in so-called classes are used to determine the minimum writing speed. Class 6 indicates a speed of 6 MB / s and the classes accordingly go up to class 10 (i.e. 10 MB / s). The class number is given in a C for “class”.

In the meantime, a classification of UHS classes has also been introduced, which starts at UHS1 or U1 (10 MB / s) and goes up to U3 (30 MB / s). This higher minimum write speed of 10 MB / s for class U1 can already guarantee a read speed of 104 MB / s. Class U3, on the other hand, even has a read speed of over 600 MB / s. A UHS-1 card can also have a higher UHS speed class. The UHS class number is given in a U.

There are also divisions into video classes. These start with V6 and go through V10, V30 and V60 up to V90. While V6 can already guarantee full HD recordings, an SDXC card with V90 rating can already write 8K recordings.

Attention: Manufacturers like to explicitly state the maximum reading speed, which is significantly higher than the writing speed.

The writing speed of the memory card can be of great importance, especially for people who want to save recordings with high resolutions. So if you want to save 4K recordings, for example, or copy films back and forth, an SD card with a higher write speed is highly recommended. For easy reading of the data (even of larger amounts of data such as films) any current card should actually be sufficient, since the average class of current SDXC cards is already very high with class 10.

Other properties

Apart from these purchase criteria, there are numerous other properties that an SDXC card can fulfill. If necessary, you can also pay attention to this. Special features of SDXC cards include:

  • Waterproof
  • Temperature resistant
  • Shock resistant
  • X-ray resistant
  • WiFi-enabled (only with classic SDXC cards)

An SDXC card that is waterproof, temperature-resistant, shock-resistant and X-ray resistant can be worthwhile, especially when used in cameras for outdoor photography. These properties can contribute significantly to extending the service life of SDXC cards and reducing the risk of data loss.

An SDXC card with WiFi capability can be useful when traveling.
There are also SDXC cards that are WiFi-enabled. Such an SDXC card can be very practical, especially when traveling, as it can often store large amounts of data (e.g. travel photos / videos) and at the same time serve as a WiFi device. Micro SDXC cards cannot have this feature.

Facts about SDXC Cards

Now you know what you should consider to find the right SDXC memory card for you and you may have already bought one. We have therefore summarized useful tips for handling SDXC cards and any problems that may arise.

Deactivate or set the SDXC card write protection

Note: Sometimes it helps to push the switch in the middle.

If this does not work, you can possibly also remove the write protection on the PC. For this you have to:

  • Insert the SD card and right-click on the storage medium.
  • Next click on “Properties”, “Sharing”, “Advanced Sharing”, “Share this folder” and then on “Permissions”.
  • Now a check mark next to the term “full access” must be set and the whole thing must be confirmed with “OK”.

Partition SDXC Card

An SDXC card can be partitioned like any other storage medium. Partitioning is basically a division of storage space into two or more equal or unequal parts. It has the effect that when you insert a memory card into a reader, you see two memory cards. This allows individual data to be protected more easily and the internal memory of reading devices to be relieved.

SDXC cards can be partitioned in different ways, depending on which device is used for reading.

Copy / clone SDXC Card

In order to create a backup copy that is 1: 1 the same as all partitions, you have to clone the memory card. There are a few programs for this that do this relatively easily and quickly. A frequently used program for this would be the Win32 Disk Imager.

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Last product update on 2022-09-29 | Source: Amazon Affiliate