SDXC Memory Card Buying Guide

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SDXC Memory Card Buying Guide

There is a broad range of memory cards available for digital camera users. Each card is designed to meet varying needs of photographers. High-capacity and high-performance memory cards are ideal for professional photographers and users who prefer to take high definition videos and photographers. SDXC memory cards are used by many of these photographers since they provide high amounts of storage capacity and high data transfer speeds, delivering a high degree of performance. When purchasing a SDXC memory card, buyers should consider compatibility with the host device. In addition, the amount of storage space needed, and the intended use of the digital camera will help inform which SDXC card is purchased.

About SDXC Memory Cards

Some of the most popular memory cards for digital cameras are Secure Digital or SD cards. SD cards are classified as flash memory or removable RAM. They are available in three different standard capacities: SD or Secure Digital Standard Capacity (SDSC), Secure Digital High Capacity (SDHC) and Secure Digital eXtended Capacity (SDXC). Standards for SD cards are maintained and overseen by the SD Card Association (SDA).
SDXC memory cards are available under a number of brand names. They provide the most storage capacity among the three types of SD standards, as well as the highest data transfer speeds. SDXC cards provide the highest levels of performance among the SD memory card family. These cards are used in a variety of electronic devices, including digital cameras, camcorders, tablets, mobile phones, televisions, and other devices.

Buying an SDXC Memory Card

A number of factors will influence the purchase of an SDXC memory card. When buying a memory card for a digital camera, how the camera is used often helps inform the decision with respect to the type of memory card. Considerations should include the price, capacity, and speed of the memory card. Whether a memory card is compatible or supported by the host device must also be considered. Generally, higher-capacity and higher-speed memory cards are relatively more expensive than lower-capacity and lower-speed cards.


Devices are designed for specific types of memory cards and will only support certain types of memory cards. When purchasing an SDXC memory card, check the user manual of the host device to identify the types of memory cards that are supported by the device. SD-compatible devices typically feature a stylised “SD” logo on the user manual or on the device itself. SDXC-compatible devices tend to feature “XC” under the standard SD logo.
Certain digital cameras are designed specifically for SDXC memory cards to ensure optimal performance when using this type of memory card. As a general rule, these devices are also compatible with other SD formats, including SD and SDHC memory cards. However, digital cameras and other devices that are designed specifically for SD cards may not support SDHX memory cards. Similarly, certain devices designed for SDHC memory cards may not fully support SDXC formats.

Card Format

SDXC cards are available is two formats or sizes, including a standard format and micro or sub-compact format. Unlike SD and SDHC memory cards, SDXC memory cards are not available in compact or mini formats. While SD and SDHC cards use the FAT 12/16 and FAT 32 file system, respectively, SDXC memory cards feature the more advanced exFAT file system. The table below summarises the two main formats of SDXC memory cards.



The standard SDXC format. This format offers users the greatest amount of capacity and the highest transfer speeds among the SD memory card family. Standard SDXC cards are the same size as SD and SDHC memory cards and measure 32 x 24 x 2.1 mm. They are typically found in larger devices, such as digital cameras and camcorders.


A sub-compact version of the SDXC card, the microSDXC measures 11 x 15 x 1.0 mm. They are the same size as other sub-compact SD cards, including the microSD and microSDHC formats. This format is typically used for smaller devices, such as tablets and mobile phones.

Storage Capacity

SDXC and microSDXC memory cards provide users with the greatest storage capacity among the three main formats of SD cards. SDXC and microSDXC memory cards are available with capacities between 32 gigabytes (GB) to 2 terabytes (TB). The amount of storage space needed is often determined by how a digital camera or other device is used. Personal preferences also play an important role in determining which memory card is purchased. Certain users prefer to avoid having multiple memory cards and will opt for the highest capacity card to minimise the number of cards needed. Higher capacity memory cards are also convenient for users who frequently use devices for high-definition videos or real-time video broadcasting to ensure there is sufficient space to record without interuption.

Transfer Speed

SDXC memory cards use different types of flash memory. The type of flash memory used is often determined by individual manufacturers. As a result, actual data transfer speeds typically depends on the manufacturer of the card and the host device itself. There are two methods of classifying transfer speed on SDXC and microSDXC memory cards. Each classification identifies minimum data transfer speeds standards, as defined by the SD Association. Transfer speeds are identified using the Speed Class mark or the Ultra High Speed (UHS) mark. SDXC memory cards with UHS include a higher speed bus interface with higher minimum writing speeds than cards with the Speed Class mark. While SDXC cards using the Speed Class mark system can be used on devices designed for UHS cards, non-UHS host devices designed for the Speed Class mark may not support UHS memory cards.

Speed Class 2

Used typically for standard definition recording, Speed Class 2 memory cards are identified with a mark featuring a 2 within a larger C. Class 2 cards generally deliver transfer speeds of at least 2 megabytes per second, although speeds can be greater depending on the manufacturer.

Speed Class 4

Class 4 memory cards are designed for full high definition recording. Like other Speed Class marks, Class 4 memory cards can be identified by a 4 within a larger C mark. These cards generally provide transfer speeds of at least 4 megabytes per second.

Speed Class 6

Like Class 4 cards, Class 6 memory cards are designed for full high definition recording. This card is typically identified with a small 6 within a larger C. Class 6 memory cards deliver transfer speeds of at least 6 megabytes per second.

Speed Class 10

Class 10 cards are designed for full high definition video recording and consecutive recording of high-definition still photography. This class of memory card is identified with a 10 within a C. Class 10 memory cards provide users with at least 10 megabytes per second transfer speeds.


UHS Class 1 or UHS-I memory cards provide data transfer speeds (or bus speeds) of between 50 and 104 megabytes per second. They are designed for recording real-time broadcasts and large-size high-definition videos. UHS-I memory cards are identified with either an I mark or a stylised SD logo over a XC I mark. UHS-I cards can also be identified with a 1 within a U.


UHS Class 2 or UHS-II memory cards deliver transfer speeds of between 156 and 312 megabytes per second. They can be identified with an II mark or a styles SD logo over a XC II mark.

Buying a SDXC Memory Card on eBay

To purchase a SDXC memory card, visit the eBay homepage. Under the All Categories tab, select the Cameras & Photography link. From the All Categories tab on the Cameras & Photography page, select Memory Cards. On the Memory Cards page, refine search results by select SDXC or microSDXC from the Format menu on the left side of the page. SDXC memory cards can also be found by using any search bar found on all eBay pages. Enter specific keywords or search terms to find SDXC memory cards, including the desired storage capacity or speed class. For example, type “new SDXC UHS-I memory card” to find unused SDXC memory cards using the UHS-I speed system.


Memory cards are designed for different types of devices and photographers. SDXC memory cards are designed for high-performance and provide the highest levels of storage space and data transfer speeds among the Secure Digital or SD family of memory cards. This makes SDXC memory cards ideal for recording high-definition, high-quality still photographs and videos. The decision to purchase a certain type of SDXC memory card is often determined by the type of device where the card will be used. Certain devices will only support specific types of memory cards. Other considerations when purchasing a SDXC memory card include price, data transfer speed and storage capacity.

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