I LOVE technology, YOU LOVE technology and WE ALL LOVE TECHNOLOGY! Right now the memory card revolution is taking place and there is just this need for more storage space. Secure Digital Extended Capacity (SDXC) memory cards are the new wave of data storage devices that will be able to deliver more than enough space for your data.

SDXC memory cards are being used in a variety of digital devices such as digital cameras, camcorders, mp3 players and others.  Even though their popularity right now is not as big as say SD or SDHC cards, you can expect to see this change in the next couple of years.

So What is the Secure Digital eXtended Capacity (SDXC) Memory Card?

The typical standard Secure Digital card capacities range from 4 MB up towards 4 GB. There was the introduction of a new format, SDHC and this saw the capacity going from 4 GB up to 32 GB. In 2009 it was announced that a new format Secure Digital eXtended Capacity (SDXC) would be released.  This SDXC format would allow for the possibility of 2 TB memory cards.

SDHC cards have the same physical shape as both SD and SDXC memory cards. These cards are really small and the size can be compared to that of a postage stamp. The typical dimensions are 24 mm (W) × 32.0 mm (H) × 2.1 mm (D) and it weighs 2 grams.

The Different SDHC Memory Card Sizes

When it comes to the Secure Digital High Capacity (SDHC) Memory Cards, there are 4 different size capacities available. This card format is available in 32GB, 16GB, 8GB and 4B sizes. With each card size, you will be able to hold a specific amount of data. Generally, the more data the card can hold, is the more expensive it will be. Memory card prices have fallen over the years and the bigger cards can be purchased for really cheap.

128GB SDXC Card

128GB SDXC Extended Capacity Cards are the newest and biggest storage sizes available. Right now they are not as popular as the 64GB version, as they are expensive, but I am positive that more and more people will make the switch in the coming years as the data demands increase. This is a good buy for those individuals or photographers who need more space.

64GB SDXC Card

Right now, the 64 GB SDXC card is the most popular from this memory card format. You find that more and more people are starting to gravitate towards this card, as it is able to deliver a really good amount of storage space, something that professional and serious photographers needed, especially when they’re taking high-quality pictures or even HD video.

48GB SDXC Card

The 48GB SDXC Extended Capacity Card is the smallest card from this series available. It is not really popular and currently, only two companies really manufacture them. This is a good option for some people who may need a bit more space than the 32GB, but might not want to go all the way up to 64GB. Sometimes, it may actually better to go and purchase the 64 GB card, simply because it can be cheaper than the 48GB cards out there.

SDXC Memory Card Speeds

So Secure Digital eXtended Capacity (SDXC) Memory Cards are the shiny new Lamborghini on the block and I must say that these cards are pretty impressive. Although you can get them in different card sizes, you can also buy these cards based on speed. Every card has a speed class rating printed on them and this is there to indicate the speed at which data can be transferred to the card.

Right now, you will be able to get SDXC cards in 2 different speeds, class 10 and UHS-1. Depending on the brand of card you get, the transfer speeds might be faster than what we list below, it really depends on what company is making the card. Below are the minimum transfer speed you should expect from the cards.

  • Class 10 – Minimum of 10 MB/s performance. (Fastest)
  • UHS-1 (SDXC CARDS) – Speeds up to 104 MB/s.

A word to the wise, even though some cards might state you will be getting this speed out the card, it ultimately boils down to the device you are using. You should also be aware that not all devices (usually the older ones), will sometimes not be able to use some speed cards. It is a good idea to see which one is the right one for your device.

Storage Capacity of SDHC Memory Cards

It is clear that 32GB, 16GB, 8GB and 4GB SDHC cards will be able to store different amounts of data. A lot of people are often confused as to how much these memory cards can actually hold. If you take a look on the table below, you will be able to get a general idea as to how much data can actually be stored on the different capacity memory cards.

**All the data used in the tables are based on estimates and the memory cards will actually be able to hold more or less data, it will be dependent on a variety of factors.

Most Popular Brands

Differences Between SDHC and SD


Capacities and Compatibility

As with any product that improves its specifications from one generation to the next, there are compatibility issues to take into account. Thusly, products that accept only the original SD card format will not be compatible with SDHC or SDXC cards. However, both SDHC and SDXC cards are backwards compatible, enabling them to read previous format cards.

To make sure you’re getting the right format of Secure Digital card, check your device’s technical specifications. Here’s a general rule of thumb:
  * If a device’s specs say that it can handle 2 GB Secure Digital cards, then it’s only compatible with the original SD format.
  * For devices that allow capacities between 4 GB and 32 GB, you’ll need an SDHC card. However, you’ll still be able to use original SD format cards.
  * If not specifically noted as being compatible with the new SDXC format, a device’s tech specs should say that it can handle 48 GB or greater. Additionally, this device will be backwards compatible with both SD and SDHC format cards.


It’s important to make sure you’re using the right SD format for your device. For example, if you insert an SDXC memory card into a PC or device that does not support the SDXC format, you may see a message prompting you to re-format the card. You should avoid doing this, as it will both erase any data stored on the SDXC card as well as change the card’s format to a different file system that will make it incompatible with devices that are compatible with SDXC cards.