What is an SDXC Card?

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The latest devices have their own storage capacities that keep all of the contents you’ve taken safe and secure. However, there are instances wherein that capacity is not enough, and you will need to add an extension so you can keep all of your files in one place. 

The SDXC card is a memory card that can be inserted into devices to give you more space for your contents without changing the quality. 

So what is an SDXC card, and how does it differ from a regular memory card? 

What is an SDXC Card?

A Secure Digital Extended Capacity or SDXC card is a small flash memory card released in 2010 created to store full high definition videos and pictures. It has greater storage capacity than the original Secure Digital or SD cards. 

Man holding an SDXC card

SDXC Card Maximum Capacity

The SDXC has the Extended Capacity or XC format that increased the maximum storage capacity from 32GB to 2 TB. The data transfer rate is also faster than the regular SD card, as it can transfer files up to 312 Mbps.

The SDXC cards were originally created for camcorders, and throughout the years, it was eventually branched out to other devices such as laptops, PCs, DSLRs, smartphones and more. 

An SDXC card with a 2TB storage capacity can store up to 100 movies, 136,000 high-quality images, and 480 hours of music. 

SDXC Card Speed Ratings

The speed of the memory card indicates how fast it takes to transfer the files from the card to the device. The speed rating is an important feature since it also affects the quality of your files, especially the videos. 

If the speed rating is slow when you transfer a 4K video, chances are there will be distortion visible when you play it back. 

Speed ratings come in four classes: they are 2, 4, 6, and 10. The coding of the speed rating is simple; Class 2 can transfer up to 2 MB per second, Class 4 can transfer up to 4 MB per second, and so on. 

With SDXC memory cards, an Ultra High Speed or UHS class rating was introduced to match the card’s capacity. Since the SDXC card can store thousands of files, it only makes sense that its speed should be fast enough to transfer hundreds of files per second. 

The UHS class ratings come in two classes: UHS Class 1 and UHS Class 3. The UHS Class 1 lets you transfer up to 10 MB of files per second, while the UHS Class 3 lets you transfer files up to 30MB per second. 

SD vs. SDHC vs. SDXC

Currently, there are three main types of memory cards: SD, SDHC, and SDXC. These memory cards have Flash technology that stores files even when there is no power. 

Each of the memory cards has a specific capacity and devices that they are compatible with.

  • SD

Released in 1999, the Secure Digital Card or SD card is a small memory card that was the first of its kind and part of the first generation of SD cards. 

The SD cards work in any device, both the old versions and the new releases. However, SD cards have a limited capacity, and it only ranges from 128MB to 2GB. 

  • SDHC

The Secure Digital High Capacity or SDHC memory card was first introduced in 2006. The SDHC card is considered a second-generation memory card and was created for the released devices in the mid-2000s. 

Since it was made to be used for second-generation devices, the SDHC card is not compatible with older devices, mostly those built in the late 90s and early 2000s. Its maximum storage capacity is 32GB. 

An SDXC card being inserted into a camera
  • SDXC

The most recent memory card to be introduced in the market is the Secure Digital Extended Capacity memory card. It was launched in 2010.

The storage capacity of the SDXC card ranges from 64GB to 2TB, making it the card with the biggest storage out of all three memory cards. 

The SDXC card is made for third-generation devices manufactured in the early 2010s to 2020. It can also be used for second-generation devices. However, the card is not compatible with first-generation devices. 

Related Questions

Which Memory Card Should You Get?

The specifications of the device that you want to transfer your files into should indicate what type of memory card you should get. 

Although the SDXC card is the best out of the three memory cards available on the market, it can’t be used for older models of devices. 

If you have the latest PC, smartphone, DSLR, SLR, or laptop, then you can go for the SDXC card so you can enjoy the speed and convenience that it offers. 

What Makes an SDXC Card Different?

The SDXC card has the same dimensions as a regular SD card. The difference is that SDXC cards are only compatible with SDXC devices such as the latest smartphones from Samsung, the Mac laptops, and the latest DSLR cameras. 


Memory cards give you the freedom to capture, store, and transfer hundreds or thousands of pictures and videos to your device. 

The SDXC card alone can keep all of your files organized and safe without compromising their quality. With the SDXC card, there won’t be a limit to what you can do. 

Kaitlin Cooper is an active professional wedding and portrait photographer in San Diego, California at Kaitlin Cooper Photography. She is also a contributor to many large publications, including Bridal GuideBustlePixpaWith Joy, and Hello Giggles.