What are other customers buying
SD XC Memory Cards (SDXC Cards) range from 64GB to 2TB. The capacity of SDXC memory cards are at present limited to 2TB.
While allowing capacities greater than 64GB SDXC, the SD XC card has created compatibility issues with older devices that are not able to read this new format, but some devices require only a firmware upgrade to become compatible. SD XC cards require SDXC capable device firmware generally not found with older devices.
SDXC memory cards have SD Speed Class Ratings made by the SD Association. The SD Speed Class Ratings specify the minimum write speeds based on the best fragmented state where no memory unit is occupied, as shown below.