There are three different types of SD cards: Secure Digital Standard-Capacity (SDSC, or just SD), Secure Digital High Capacity (SDHC), and Secure Digital eXtended Capacity (SDXC.)

SD cards are sorted firstly by their ‘family’, which indicates their data storage and other capabilities. There’s SDSC (Standard Capacity), SDHC (High Capacity), SDXC (eXtended Capacity), and SDIO (combined input/output functions and data storage).

Both SD and microSD cards share the same standards: SD, SDHC, SDXC, and SDUC and microSD, microSDHC, microSDXC, and microSDUC. The two standards that are more popular today for both SD and microSD cards are SDHC and SDXC. The main difference among the SD standards is storage capacity.

The difference between SD, SDHC, SDXC and SDUC cards are purely based on the memory capacity range. Here’s a little breakdown on the different types of SD cards: As mentioned before, SD, SDHC, SDXC and SDUC cards all look the same and can fit in pretty much any device that has an SD card slot.